An Archive of emails regarding the Univ of Colorado Niwot Ridge AmeriFlux Tower/Site (US-NR1). SpB (sean.burns@colorado.edu) ---------------------------------------------------------------------- Date: Fri, 24 Feb 2023 11:11:29 -0700 To: blanken@colorado.edu cc: sean.burns@colorado.edu From: Sean Burns Subject: 2022 US-NR1 AmeriFlux Data.... Date: Fri, 24 Feb 2023 11:11:29 -0700 Hi All, The 2022 US-NR1 AmeriFlux site climate and flux data files have been uploaded to our urquell website which is: https://urquell.colorado.edu/data_ameriflux/ The data files are: - -rw-r--r--. 1 sburns facstaff 6440420 Feb 22 13:18 climate_2022_ver.2023.02.22.dat - -rw-r--r--. 1 sburns facstaff 3022198 Feb 22 13:19 climate_flags_2022_ver.2023.02.22.dat - -rw-r--r--. 1 sburns facstaff 3459451 Feb 22 13:19 flux_2022_ver.2023.02.22.dat - -rw-r--r--. 1 sburns facstaff 2145345 Feb 22 13:20 flux_flags_2022_ver.2023.02.22.dat A form of these data have also been uploaded to the LBL server. After the LBL data have been QC'ed, they should also be available via the LBL website. We also updated the soil files from the past several years (available in the "data_30min" directory): - -rw-r--r--. 1 sburns facstaff 5626404 Feb 14 14:19 soil_2020_ver.2023.02.14.dat - -rw-r--r--. 1 sburns facstaff 5606870 Feb 14 14:21 soil_2021_ver.2023.02.14.dat - -rw-r--r--. 1 sburns facstaff 5607600 Feb 14 14:22 soil_2022_ver.2023.02.14.dat And I created photo pages for the past two years: https://urquell.colorado.edu/photos/photos_2021.html https://urquell.colorado.edu/photos/photos_2022.html these contain all the photos taken during site visits. The photos can also be found via the urquell site calendar: https://urquell.colorado.edu/calendar/ At one of the zoom meetings organized by Housen/LBL, someone mentioned that it would be helpful to have an archive of emails from the AmeriFlux sites...this would be a way to document issues discussed, the evolution of the site data, etc...I already had an archive of around 300 emails written between 2007-2022 that discuss the US-NR1 data....while not complete documentation, many/most of these are with AmeriFlux (Danielle, Housen, Gilberto, Dario, or pre-LBL with Bai Yang) trying to better understand/document the US-NR1 data...I put these emails in the "docs" section of the main urquell website..here is the specific link: https://urquell.colorado.edu/data_ameriflux/docs/emails_AmeriFlux_usnr1_da= ta_archive.txt they are in reverse chronological order....last summer, CU started enforcing new rules about email software...so my ability to save/record these email records will likely not be as good in the future....but I'll do what I can to keep this information updated.... If you no longer wish to receive these US-NR1 updates, please let me know.... cheers! SpB. ---------------------------------------------------------------------- Date: Wed, 30 Mar 2022 12:55:29 -0600 To: sean.burns@colorado.edu cc: sean@ucar.edu From: Sean Burns Subject: Winter at Niwot Ridge AmeriFlux site... Hi All, Peter asked me to write a short blog post about winter visits to the US-NR1 AmeriFlux site, here it is: https://ameriflux.lbl.gov/note-from-the-flux-site-winter-at-niwot-ridge/ Many of you have either been to the site in winter or know what these trips are like... cheers! SpB. ------------------------------------------------------------------------------ Sean Burns Department of Geography Campus Box 260 University of Colorado Boulder, CO 80309-0260 for FEDex: Guggenheim 110 Internet: sean.burns@colorado.edu http://www2.mmm.ucar.edu/people/burns/ Phone: (303) 497-8934 Fax: (303) 492-8699 ------------------------------------------------------------------------------ ---------------------------------------------------------------------- Date: Wed, 09 Feb 2022 13:22:44 -0700 To: blanken@colorado.edu cc: sean.burns@colorado.edu Bcc: data_users From: Sean Burns Subject: 2021 US-NR1 AmeriFlux data... Hi All, The 2021 US-NR1 AmeriFlux site climate and flux data files have been uploaded to our urquell website which is: http://urquell.colorado.edu/data_ameriflux/ the 2021 data files can be found in: http://urquell.colorado.edu/data_ameriflux/data_30min/ the files are: 6439741 Feb 9 13:07 climate_2021_ver.2022.02.09.dat 3021526 Feb 9 13:08 climate_flags_2021_ver.2022.02.09.dat 3458783 Feb 9 13:08 flux_2021_ver.2022.02.09.dat 2144673 Feb 9 13:09 flux_flags_2021_ver.2022.02.09.dat We will upload these data to the AmeriFlux LBL portal soon...if anyone notices any issues or problems with these data files please let us know...or if you no longer want to receive emails about the US-NR1 data updates, please let me know and you will be removed from the email list.... thanks! SpB. ---------------------------------------------------------------------- Date: Thu, 13 May 2021 11:31:15 -0600 To: blanken@colorado.edu cc: sean.burns@colorado.edu Bcc: data_users From: Sean Burns Subject: 2020 US-NR1 AmeriFlux data files... Hi All, I have uploaded the 2020 US-NR1 AmeriFlux site climate and flux data files to our urquell website which is: http://urquell.colorado.edu/data_ameriflux/ the 2020 data files can be found in: http://urquell.colorado.edu/data_ameriflux/data_30min/ and are: 6456895 May 13 10:56 climate_2020_ver.2021.05.13.dat 3029314 May 13 10:57 climate_flags_2020_ver.2021.05.13.dat 3467761 May 13 10:57 flux_2020_ver.2021.05.13.dat 2150061 May 13 10:58 flux_flags_2020_ver.2021.05.13.dat We will re-format and upload these data to the AmeriFlux LBL portal soon (either tomorrow or next week)...if anyone notices any issues or problems with these data files please let us know... Also, in Fall 2020, we created an ESS-DIVE archive of the US-NR1 data, photos, videos, logbook, calendar, and other information between years 1998-2020. The reference is: Burns, S.P., P.D. Blanken, and R.K. Monson, 2020: Data, Photographs, Videos, and Information for the Niwot Ridge Subalpine Forest (US-NR1) AmeriFlux site. AmeriFlux Management Project, ESS-DIVE Dataset, https://doi.org/10.15485/1671825 An overview/README file of the archive is provided here: http://urquell.colorado.edu/data_ameriflux/docs/README_ESS_DIVE_USNR1_readme_first.pdf This archive is designed to replicate all the information on the urquell website and includes 5-min statistics (means, variances, covariances) of all data collected by the tower data system. If anyone has any questions or would like to stop getting these emails about the US-NR1 data updates, please let me know.... cheers! SpB. ---------------------------------------------------------------------- Date: Mon, 09 Mar 2020 15:01:40 -0600 To: blanken@colorado.edu From: Sean Burns cc: sean.burns@colorado.edu Subject: 2019 US-NR1 AmeriFlux data files... Hi All, Last week I uploaded the 2019 US-NR1 AmeriFlux site climate and flux data files to our urquell website which is: http://urquell.colorado.edu/data_ameriflux/ the 2019 data files can be found in: http://urquell.colorado.edu/data_ameriflux/data_30min/ and are: 6438403 Mar 5 15:51 climate_2019_ver.2020.03.05.dat 3020182 Mar 5 15:52 climate_flags_2019_ver.2020.03.05.dat 3457429 Mar 5 15:52 flux_2019_ver.2020.03.05.dat 2143329 Mar 5 15:53 flux_flags_2019_ver.2020.03.05.dat We will re-format and upload these data to the AmeriFlux LBL portal later this week...if anyone notices any issues or problems please let us know... A few other short comments: * We compiled a list of papers published since 2014 that use the US-NR1 site data: http://urquell.colorado.edu/data_ameriflux/docs/ameriflux_usnr1_pubs_since_2014_200218.pdf The corresponding bib file is here: http://urquell.colorado.edu/data_ameriflux/docs/ameriflux_usnr1_pubs_since_2014_200218.bib If we are missing any papers in this list, please let us know. When/if we have time, we hope to create a more complete list that dates back to the early papers by Russ and others (starting around 2001/2002). * We never created the "ESS-DIVE" (https://ess-dive.lbl.gov/) archive of the data from urquell that was mentioned in the email from last year. Thanks to those that replied about this...we are still talking about the best way to go about this, but I think that we will likely try to archive everything from the urquell website (hopefully, including the 15000+ photos that are there)...these are the web pages such as: http://urquell.colorado.edu/data_ameriflux/docs/ http://urquell.colorado.edu/data_ameriflux/data_archive/ http://urquell.colorado.edu/data_ameriflux/data_supplemental/ http://urquell.colorado.edu/calendar/ http://urquell.colorado.edu/logbook/ http://urquell.colorado.edu/photos/photos_2019.html http://urquell.colorado.edu/photos/photos_2018.html etc... most other related data sets (such as phenocam) are already archived in some way or location (so I don't think it's necessary to include it within the ESS-DIVE archive....Peter and I plan to figure out the specific details related to this soon... * This year, I plan to process all the subcanopy flux data to share next year.... If you no longer want to receive these emails related to the US-NR1 site, please let me know! cheers! SpB. -------------------------------------------------------------------------- Sean Burns Department of Geography Campus Box 260 University of Colorado Boulder, CO 80309-0260 for FEDex: Guggenheim 110 Internet: sean.burns@colorado.edu http://www2.mmm.ucar.edu/people/burns/ Phone: (303) 497-8934 Fax: (303) 492-8699 -------------------------------------------------------------------------- ---------------------------------------------------------------------- Date: Wed, 16 Jan 2019 14:44:42 -0700 To: blanken@colorado.edu cc: sean.burns@colorado.edu From: Sean Burns Subject: Re: 2018 US-NR1 AmeriFlux data files... Hi, A few follow-ups to my email from yesterday: * If you have or are using any "preliminary" data from the US-NR1 site, please do not use those data files any longer (instead, replace them with the most current data release). Ideally, any "preliminary" data files should be deleted. * We would especially encourage anyone with data sets that have already been published to submit these to our urquell "supplemental" data archive. * Anyone that provides us with data will have the option to be included as a co-author on the ESS-DIVE data citation for the urquell data set. We will do our best to make sure the acknowledgements for your supplied data set are clearly stated and as you want them to be. If you no longer wish to receive these email updates about the US-NR1 AmeriFlux data, please let me know. thanks! SpB. ---------------------------------------------------------------------- Date: Tue, 15 Jan 2019 12:01:05 -0700 To: ameriflux@lbl.gov cc: sean.burns@colorado.edu, blanken@colorado.edu From: Sean Burns Subject: 2018 US-NR1 AmeriFlux data files... Hi All, I have updated the urquell website with the 2018 US-NR1 data: http://urquell.colorado.edu/data_ameriflux/ the 2018 data files are: -rw-r--r-- 6437981 Jan 15 10:47 climate_2018_ver.2019.01.15.dat -rw-r--r-- 3019762 Jan 15 10:48 climate_flags_2018_ver.2019.01.15.dat -rw-r--r-- 3457016 Jan 15 10:48 flux_2018_ver.2019.01.15.dat -rw-r--r-- 2142909 Jan 15 10:49 flux_flags_2018_ver.2019.01.15.dat Within the next few weeks, I will upload these latest data files to AmeriFlux (following the AmeriFlux "FP-In" format)...also, the photos taken at the site in 2018 can be found here: http://urquell.colorado.edu/photos/photos_2018.html Sometime within the next few months, we will be archiving all the data and information from the urquell website using "ESS-DIVE" (https://ess-dive.lbl.gov/). This will provide a DOI for these data and information and (hopefully) allow the US-NR1 data and information on urquell to survive beyond the lifetime of urquell (which is a computer on the CU campus), as well as my own lifetime! As part of this archiving process, we are looking to add any data that might have been collected at the US-NR1 site in the past (for example, data that have been collected for short periods)...as a place to store such data, I've created a new subdirectory "data_supplemental": http://urquell.colorado.edu/data_ameriflux/data_supplemental/ so far, I added one data set which is a list of tree heights and DBH by location and species as measured near the tower in 2003 (for 241 fir, 148 spruce, and 358 pine trees)..the files are: -rw-r--r-- 8722 Jun 8 2018 ameriflux_USNR1_trees_fir.csv -rw-r--r-- 12854 Jun 8 2018 ameriflux_USNR1_trees_pine.csv -rw-r--r-- 5488 Jun 8 2018 ameriflux_USNR1_trees_spruce.csv These data were discussed in section 2.3 of a 2005 JGR paper: Yi, C., R.K. Monson, Z. Zhai, D.E. Anderson, B. Lamb, G. Allwine, A.A. Turnipseed, and S.P. Burns, 2005: Modeling and measuring the nighttime drainage flow in a high-elevation, subalpine forest with complex terrain. Journal of Geophysical Research, 110, D22303, doi:10.1029/2005JD006282 We are looking to add any other data sets that people might be willing to share (I have a few of my own to add)....I might bother a few of you to ask if you would be willing to include your data here...a short readme file so you can get credit and/or ask for any acknowledgements would be very useful to have along with the data. Of course, sharing your data is completely voluntary...this takes some time to organize and people have other ways they are sharing such data. We will let everyone know after the ESS-DIVE archive has been created (and/or please let us know if there are any questions or concerns about this). cheers! SpB. ------------------------------------------------------------------------------ Sean Burns Department of Geography Campus Box 260 University of Colorado Boulder, CO 80309-0260 for FEDex: Guggenheim 110 Internet: sean.burns@colorado.edu http://www2.mmm.ucar.edu/people/burns/ Phone: (303) 497-8934 Fax: (303) 492-8699 ------------------------------------------------------------------------------ ---------------------------------------------------------------------- Date: Wed, 28 Nov 2018 13:23:31 -0700 To: ameriflux@lbl.gov cc: sean.burns@colorado.edu, Peter Blanken From: Sean Burns Subject: US-NR1 AmeriFlux data update... Hi, You are receiving this email because you have used or been interested in the US-NR1 AmeriFlux site data at some point. If you would like to be removed from this email list, please let me know. We have updated the US-NR1 AmeriFlux data on the urquell webserver to include the 2015-2017 data files. Within the next few weeks, I will upload these latest data files to AmeriFlux (following the AmeriFlux "FP-In" format)... I posted the ver.2018.11.28 data files to our data webpage which is: http://urquell.colorado.edu/data_ameriflux/ All the updated data files (listed at the end of this email) can be downloaded as a single zip file from: http://urquell.colorado.edu/data_ameriflux/data_30min/ameriflux_data_ver.2018.11.28.zip For this release, we did not re-calculate any fluxes from the hi-rate data for years prior to 2015. The primary objective was to release the 2015-2017 data. Details are listed in an example data header at the end of this email. A few additional notes: * We considered no longer using the urquell website to supply the US-NR1 data to our collaborators. However, we decided it was still a useful system/mechanism to have available and, at least for now, the data format will stay similar to what it has been in the past (details about changes to the format in ver.2018.11.28 are below). * At the AmeriFlux meeting last Oct, the possibility of having the urquell website mirrored using "ESS-DIVE" (https://ess-dive.lbl.gov/) was mentioned by the AMP team. We hope to make this happen so all of the information on the urquell website will be archived/saved. * Finally, we added a new subdirectory to urquell which contains past versions of the US-NR1 data: http://urquell.colorado.edu/data_ameriflux/data_archive/ the zip-archived versions of the previous data start from 2003 and include the last release in 2015: -rw-r--r-- 6693242 Nov 28 11:59 ameriflux_USNR1_archive_ver030101.zip -rw-r--r-- 19727020 Nov 28 12:01 ameriflux_USNR1_archive_ver080311.zip -rw-r--r-- 24316694 Nov 28 12:03 ameriflux_USNR1_archive_ver090811.zip -rw-r--r-- 34273597 Nov 28 12:07 ameriflux_USNR1_archive_ver110420.zip -rw-r--r-- 42100901 Nov 28 12:08 ameriflux_USNR1_archive_ver151110.zip This could be useful, for example, if you are trying to recreate a figure that used an older version of the US-NR1 data. If you see problems with the ver.2018.11.28 data files please let me know...we plan to release the 2018 data in January (and future data releases will be more timely!)... cheers! SpB. ------------------------------------------------------------------------------ Sean Burns Department of Geography Campus Box 260 University of Colorado Boulder, CO 80309-0260 for FEDex: Guggenheim 110 Internet: sean.burns@colorado.edu http://www2.mmm.ucar.edu/people/burns/ Phone: (303) 497-8934 Fax: (303) 492-8699 ------------------------------------------------------------------------------ Example Data File Header: ------------------------- % -- Niwot Ridge Subalpine Forest AmeriFlux Data (site ID: US-NR1) -- % MST Time Period: 2013 01/01 00:00:00 - 2014 01/01 00:00:00, JD 1.000-366.000 (MST) % UTC Time Period: 2013 01/01 07:00:00 - 2014 01/01 07:00:00, JD 1.292-366.292 (UTC) % File Name: flux_2013_ver.2018.11.28.dat % File Created by: Sean Burns (sean.burns@colorado.edu) % File Created for: CU Ameriflux Web Site (http://urquell.colorado.edu/data_ameriflux/) % Date: 28-Nov-2018 % -------- % % Data Version: ver.2018.11.28 % % % NOTES: % % Info about ver.2018.11.28: % % * Unless noted otherwise, all information listed below for past % versions also applies to the current version. % % * ver.2018.11.28 includes data from 2015, 2016, and 2017 % % * Changes to ver.2018.11.28 were applied to data from all years % (1998-2014). For years prior to 2015, No turbulent fluxes were % re-calculated. % % * These US-NR1 climate/flux data are also available from AmeriFlux % (http://ameriflux.lbl.gov/) where additional QA/QC has been performed, % GPP and respiration have been calculated, all vertical levels of the % Bowling CO2 mean and isotope data are included, and the data format is % consistent with other AmeriFlux sites. We provide these climate and % flux data files for collaborators and others that might be interested in % using them. However, we encourage people to use the AmeriFlux website % to obtain these data. We would appreciate any descrepancies between % the data herein and AmeriFlux be reported to us (these data should be % consistent with each other). % % * The AmeriFlux website with more information on US-NR1 is: % % http://ameriflux.lbl.gov/sites/siteinfo/US-NR1 % % * The US-NR1 data from AmeriFlux now has a DOI associated with it. The % approriate reference would be: % % Blanken, P. D., R. K. Monson, S. P. Burns, D. R. Bowling, and % A. A. Turnipseed, Data and Information for the AmeriFlux US-NR1 Niwot % Ridge Subalpine Forest (LTER NWT1) Site, AmeriFlux Management Project, % Lawrence Berkeley National Laboratory, California, % doi:10.17190/AMF/1246088 % % * New data are added as additional columns toward the END of the existing % columns. This way, the old data column order is preserved. % % * added the vertical flux of CO2 (w_co2) as a new column in % the flux data files (in column 24) % % * added the heat storage in the soil (Strg_soil) as a new column in % the flux data files (in column 22) % % * The measurement of soil temperature and moisture was changed on % 1 January 2006: prior to that date, data from multiple sensors were % averaged, after that date, a single pair of newer sensors were used % % * To make this change in soil temperature/moisture sensors more apparent/ % obvious in the climate files, we expanded the soil temperature and % moisture from 2 columns to 4 columns (2 for prior to 2006, 2 starting in % 2006, see the climate data file header for details) % % * Additional details about the calculation of Strg_soil as well as the 2006 % changes to the soil temperature/moisture measurement are in the Appendices % of Burns, et al. 2015, https://doi.org/10.5194/bg-12-7349-2015 % % * In Sept, 2016 the Bowling TGA which measured CO2 profiles was removed from % the US-NR1 site. % % * The LI-6251 CO2 profile system stopped working properly around mid-2013. % % * Because we no longer have a CO2 profile, the CO2 storage term (Strg_co2) % is from an empirical model. The model estimates Strg_co2 based on % the time of day, wind speeed, and the vertical temperature % difference between 21.5m and 2m. It does not reproduce the extreme % events in the observed Strg_co2, but gives an average diel cycle similar % to the measured CO2 storage term. A few evaluation plots are shown here: % % http://urquell.colorado.edu/data_ameriflux/docs/co2_storage_2012.png % http://urquell.colorado.edu/data_ameriflux/docs/co2_storage_2012_monthly.pdf % % * For the 2015 flux data onward, we started using the LI-7200 IRGA for % gap-filling the LI-6262 CO2 flux data % % * For the 2015 flux data onward, we started using the LI-7200 IRGA for % gap-filling the Krypton Hygrometer and LI-6262 H2O flux data % % * For (primarily) historical reasons, we have left the NEE data in columns % 8 and 9 of the flux data files. However, our QA/QC and gap-filling is now % done directly to the vertical CO2 flux because this is the measured % quantity. % % * In a future data release we plan to include the fluxes calculated from % individual sensors so the user will be able to evaluate the different % sensors available and use the one they prefer most. This will likely be % distributed as a separate data file containing the flux data from % different (unique) instruments. % % Info about ver.2015.11.10: --------------------------------------------- % % * ver.2015.11.10 includes data from 2014 % % * Changes to data in ver.2015.11.10 were applied to data from all % years (1998-2014). No turbulent fluxes were re-calculated. % % * Rsw_out CNR1 data prior to 2005 have been corrected using a correction % factor of 0.6 (ie, s_Rsw_out_25m_KZ = 0.6*s_Rsw_out_25m_KZ_raw) % % We chose to correct the older CNR1 data based on two inter-comparisons % with the AmeriFlux QA/QC team (Cristoph Thomas in 2006 and Stephen % Chan/Sebastien Biraud in 2013) that showed the recent CNR1 data to be % fairly close to the reference CNR1 they used. % % * in climate_2013_ver.2015.01.28.dat, the barometric pressure had an % incorrect offset applied (this has now been fixed) % % * QA/QC cut-off limits have been adjusted/changed for: % % Qe_21m: Latent Heat Flux % Qh_soil: Soil Heat Flux % Strg_Qh: Sensible Heat Storage % Strg_needle: Needle Heat Storage % % * Erroneous night-time Rppfd_in_25m from 1999-2002 have been fixed % % * Ensured VPD is calculated with 8-m TRH sensor % % * replaced the binary wet_b data with leaf_wet_scaled which is an % average leaf wetness between 0 (dry) and 1 (wet) where values between % 0 and 1 are considered partially-wet % % * Ensured that T_bole is from a consistent sensor depth, this is: % % Fir = 2 cm into bole % Pine = 3 cm into bole % Spruce = 2 cm into bole % % * re-calculated Strg_bole: this is now done using only the pine % trees. It is important to note that due to equipment failures % different trees are sampled for different periods. The trees % sampled are: % % 1 Jan 2004 - 17 July 2006: pine2 and pine3 % 24 Oct 2006 - 31 Dec 2010: pine2, pine3, pine11, pine16 % 1 Jan 2011 - 21 Sep 2015: pine11, pine16 % % * a future data release will include the individual bole temperature % measurements % % * For 2011 on-ward, added a new column to the flux data file which is: % % Qh_Ttc_21m : Sensible Heat Flux using a co-located Thermocouple % % For more details see Burns, et al (2012) "Using sonic anemometer % temperature to measure sensible heat flux in strong winds", Atmos. % Measurement Techniques % % Info about ver.2015.01.30: --------------------------------------------- % % * Bai Yang noticed two issues with ver.2014.12.02 which are corrected % for in ver.2015.01.28: % % - the picarro Deuterium data (dD_picarro) were the delta-O-18 % (d180_picarro) data (this was due to a typo in my code). % % - there were some anomolous Rnet (REBS) data at night. These were % removed and gap-filled with Rnet from the KZ CNR1 sensor % % * even though both these issues were with the climate data files, I % re-created both the flux and climate files so they have a consistent % file name. % % Info about ver.2014.12.02 (notes below also apply to current version): % % * to remove spikes in flux data, applied a very light 5-point median % filter to Fco2_21m_nee_*, Qe_21m, Qh_21m % % * It is recommended that an empirical correction (of around 0.25C) be % applied to the Ta_8m data. The correction has NOT been applied, % but one possible form could be: % % Ta = Ta_raw + T_corr, where T_corr=0.25 degC % % - The correction was determined based on (1) temperature comparisons % with the oregon state prt in Sept 2005, (2) comparisons with % unaspirated thermocouples, (3) comparisons with other temperature % measurements at high WS. % % * a krypton hygrometer is used as the primary latent heat flux (Qe) % instrument; however when the krypton data are missing, an "enhanced" % Qe from the closed-path LI-6262 are used. The enhancement factor % takes into account Qe information lost in the tubing. % % * the tipping bucket Met One precipitation data measured at the % AmeriFlux tower should not be used after 2011. Starting in 2011, we % have replaced the precip data with those from the USCRN Boulder W14 % site (http://www.ncdc.noaa.gov/crn/) which is less than 1km from the % AmeriFlux tower. It should also be noted that the Met One gauge is % unshielded, so winter-time precipitation will have a large undercatch % due to snow blowing past the entrance/opening of the gauge. % % * an empirical correction (of the form T_corr = A*T_raw + B) has been % applied to the 107L raw soil temperature data. The correction % was determined at the NCAR Calibration Lab (EOL) and the result is to % decrease the raw soil temperature by approx 0.2-0.5 degC. % % * the mean co2 data were measured with a tunable diode laser (TDL) % using an inlet at 21.5m on the CU tower. These data are supplied % courtesy of Dave Bowling (david.bowling@utah.edu). To obtain % more information about these data, and to get mean co2 and stable % isotope (del13c) data from other levels on the tower, please visit % the webpage: % % http://www.biology.utah.edu/bowling/ % % * From Nov 2011-2013, a vertical profile (8 levels) of water vapor % isotopes was measured with a Picarro l2120-i gas analyzer. Water % vapor dry mole fraction and the isotopic ratio (d18O and dD, reported % relative to VSMOW) from the 24.3m inlet are provided here. The % calibration and sampling protocol closely follows that described in % Berkelhammer et al., (2013), "The nocturnal water cycle in an open % canopy", Journal of Geophysical Research. These data are supplied % courtesy of David Noone (dcn@coas.oregonstate.edu) and Max Berkelhammer % (berkelha@uic.edu). To get more information about these data and % to obtain the data from other tower levels, please contact David % or Max directly. When these data are unavailable, the column is set % to NaN. % % % * For other specific details please see: % % http://urquell.colorado.edu/calendar/ % % http://urquell.colorado.edu/data_ameriflux/docs/ % % % -------- % % Flux Data Files Columns are: % % 1-6. Year, Month, Day, Hour, Minute, Sec -- in MST, Time Stamp Corresponds to center of Averaging Time Period % 07. Decimal Day of Year (MST) % 08. Fco2_21m_nee umol/m2/s 21.5m CO2 Flux (NEE = w'co2' + storage flux) CSAT3 Sonic + LI-6262 + Strg_co2 % 09. Fco2_21m_nee_wust umol/m2/s 21.5m CO2 Flux (same as above but w/ ustar filter) CSAT3 Sonic + LI-6262 + Strg_co2 % 10. Strg_co2 umol/m2/s 0.5-21.5m CO2 Canopy Storage LI-COR LI-6251 (or TGA100) % 11. u_w_21m m2/s2 21.5m Momentum Flux (kinematic units) CSAT3 Sonic % 12. Taua_21m kg/m/s2 21.5m Momentum Flux CSAT3 Sonic % 13. Qh_21m W/m2 21.5m Sensible Heat Flux CSAT3 Sonic % 14. Qe_21m W/m2 21.5m Latent Heat Flux CSAT3 Sonic + Krypton Hygrometer (or LI-6262) % 15. w_h2o_21m mmol(H2O)/m2/s 21.5m Water Vapor Flux (same as Qe_21m) CSAT3 Sonic + Krypton Hygrometer % 16. Qh_soil W/m2 0 to -10cm Soil Heat Flux REBS HFT-1 % 17. Strg_Qh W/m2 2m+8m+21.5m Sensible Heat Storage Vaisala HMP-35D % 18. Strg_Qe W/m2 2m+8m+21.5m Latent Heat Storage Vaisala HMP-35D % 19. Strg_bole W/m2 1.5m (3 cm depth) Bole Heat Storage (Pine trees) Campbell A3537 (T-type Thermocouples) % 20. Strg_needle W/m2 8m Needle Heat Storage Vaisala HMP-35D % 21. Strg_soil W/m2 -5cm Soil Heat Storage Campbell 107L + CS616 % 22. Qh_Ttc_21m W/m2 21.5m Sensible Heat Flux (from Thermocouple) CSAT3 Sonic + E-type Thermocouple % 23. w_co2_21m umol/m2/s 21.5m CO2 Vertical Flux (w'co2') CSAT3 Sonic + LI-6262 % -------- % % -------- % % Climate Data Files Columns are: % % 1-6. Year, Month, Day, Hour, Minute, Sec -- in MST, Time Stamp Corresponds to center of Averaging Time Period % 07. Decimal Day of Year (MST) % 08. T_21m degC 21.5m Air Temperature Vaisala HMP-35D % 09. RH_21m percent 21.5m Relative Humidity Vaisala HMP-35D % 10. P_bar_12m kPa 12m Barometric Pressure Vaisala PTB-101B % 11. ws_21m m/s 21.5m Wind Speed Campbell Scientific CSAT3 Sonic % 12. wd_21m deg from N 21.5m Wind Direction (from true North) Campbell Scientific CSAT3 Sonic % 13. ustar_21m m/s 21.5m friction velocity Campbell Scientific CSAT3 Sonic % 14. z_L_21m NA 21.5m Stability Parameter Campbell Scientific CSAT3 Sonic % 15. precip_mm mm NaN Precipitation USCRN Precip Data (see notes) % 16. Td_21m degC 21.5m Dewpoint Temperature Vaisala HMP-35D % 17. vpd kPa 8m Vapor Pressure Deficit Vaisala HMP-35D % 18. leaf_wetness 0=dry 1=wet 13.5m Wetness Campbell Model 237 % 19. T_soil degC -5cm Soil Temperature Campbell 107L (thermistor) % 20. T_bole_pine degC 3 cm in bole Pine Bole Temperature Campbell A3537 (T-type Thermocouples) % 21. T_bole_fir degC 2 cm in bole Fir Bole Temperature Campbell A3537 (T-type Thermocouples) % 22. T_bole_spruce degC 2 cm in bole Spruce Bole Temperature Campbell A3537 (T-type Thermocouples) % 23. Rppfd_in_25m umol/m2/s 25.5m Incoming Photosynthetic Active Photon Flux Density (PPFD) LI-COR 190-SA % 24. Rppfd_out_25m umol/m2/s 25.5m Outgoing PPFD LI-COR 190-SA % 25. Rnet_25m_REBS W/m2 25.5m Net Radiation REBS Q-7.1 % 26. Rsw_in_25m_KZ W/m2 25.5m Incoming Shortwave Radiation Kipp and Zonen CNR1 % 27. Rsw_out_25m_KZ W/m2 25.5m Outgoing Shortwave Radiation Kipp and Zonen CNR1 % 28. Rlw_in_25m_KZ W/m2 25.5m Incoming Longwave Radiation Kipp and Zonen CNR1 % 29. Rlw_out_25m_KZ W/m2 25.5m Outgoing Longwave Radiation Kipp and Zonen CNR1 % 30. T_2m degC 2m Air Temperature Vaisala HMP-35D or HMP-45D % 31. T_8m degC 8m Air Temperature Vaisala HMP-35D % 32. RH_2m percent 2m Relative Humidity Vaisala HMP-35D % 33. RH_8m percent 8m Relative Humidity Vaisala HMP-35D % 34. h2o_soil m3/m3 -5cm Volumetric Soil Moisture Campbell CS616 % 35. co2_21m umol/mol 21.5m Carbon Dioxide Mixing Ratio Campbell TGA100 % 36. h2o_picarro mmol/mol 24.3m Water Vapor Mixing Ratio Picarro L2120i % 37. dD_picarro per mil 24.3m Deuterium Picarro L2120i % 38. d180_picarro per mil 24.3m delta-O-18 (ratio of oxygen-18:oxygen-16) Picarro L2120i % 39. T_soil_stp degC Avg of 0-10cm Soil Temperature (prior to 2006) REBS STP-1 (mulitple sensors) % 40. h2o_soil_615 m3/m3 0 to -15cm Volumetric Soil Moisture (prior to 2006) Campbell CS615 (mulitple sensors) % -------- List of Updated Files: ----------------------- -rw-r--r-- 1 sburns staff 1096875 Nov 28 11:55 climate_1998_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6437559 Nov 28 11:56 climate_1999_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6455130 Nov 28 11:57 climate_2000_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6437562 Nov 28 11:58 climate_2001_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6437558 Nov 28 12:00 climate_2002_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6437560 Nov 28 12:01 climate_2003_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6455123 Nov 28 12:02 climate_2004_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6437552 Nov 28 12:04 climate_2005_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6437550 Nov 28 12:05 climate_2006_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6437550 Nov 28 12:06 climate_2007_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6455125 Nov 28 12:07 climate_2008_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6437560 Nov 28 12:09 climate_2009_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6437557 Nov 28 12:10 climate_2010_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6437568 Nov 28 12:11 climate_2011_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6455132 Nov 28 12:13 climate_2012_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6437564 Nov 28 12:15 climate_2013_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6437559 Nov 28 12:17 climate_2014_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6437554 Nov 28 12:36 climate_2015_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6455123 Nov 28 12:38 climate_2016_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 6437555 Nov 28 12:40 climate_2017_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 524087 Nov 28 11:55 climate_flags_1998_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3019341 Nov 28 11:56 climate_flags_1999_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3027550 Nov 28 11:58 climate_flags_2000_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3019342 Nov 28 11:59 climate_flags_2001_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3019342 Nov 28 12:00 climate_flags_2002_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3019342 Nov 28 12:01 climate_flags_2003_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3027550 Nov 28 12:03 climate_flags_2004_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3019341 Nov 28 12:04 climate_flags_2005_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3019342 Nov 28 12:05 climate_flags_2006_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3019341 Nov 28 12:07 climate_flags_2007_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3027549 Nov 28 12:08 climate_flags_2008_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3019341 Nov 28 12:09 climate_flags_2009_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3019342 Nov 28 12:10 climate_flags_2010_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3019340 Nov 28 12:12 climate_flags_2011_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3027548 Nov 28 12:14 climate_flags_2012_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3019342 Nov 28 12:16 climate_flags_2013_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3019342 Nov 28 12:18 climate_flags_2014_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3019342 Nov 28 12:37 climate_flags_2015_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3027550 Nov 28 12:38 climate_flags_2016_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3019342 Nov 28 12:40 climate_flags_2017_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 596555 Nov 28 11:55 flux_1998_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3456588 Nov 28 11:57 flux_1999_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3466001 Nov 28 11:58 flux_2000_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3456591 Nov 28 11:59 flux_2001_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3456592 Nov 28 12:00 flux_2002_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3456592 Nov 28 12:02 flux_2003_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3466004 Nov 28 12:03 flux_2004_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3456593 Nov 28 12:04 flux_2005_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3456596 Nov 28 12:06 flux_2006_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3456596 Nov 28 12:07 flux_2007_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3466007 Nov 28 12:08 flux_2008_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3456600 Nov 28 12:09 flux_2009_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3456592 Nov 28 12:11 flux_2010_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3456593 Nov 28 12:12 flux_2011_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3466005 Nov 28 12:14 flux_2012_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3456586 Nov 28 12:16 flux_2013_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3456598 Nov 28 12:18 flux_2014_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3456588 Nov 28 12:37 flux_2015_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3466004 Nov 28 12:39 flux_2016_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 3456596 Nov 28 12:41 flux_2017_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 376844 Nov 28 11:56 flux_flags_1998_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2142483 Nov 28 11:57 flux_flags_1999_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2148297 Nov 28 11:58 flux_flags_2000_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2142489 Nov 28 11:59 flux_flags_2001_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2142489 Nov 28 12:01 flux_flags_2002_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2142489 Nov 28 12:02 flux_flags_2003_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2148297 Nov 28 12:03 flux_flags_2004_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2142489 Nov 28 12:04 flux_flags_2005_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2142489 Nov 28 12:06 flux_flags_2006_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2142489 Nov 28 12:07 flux_flags_2007_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2148297 Nov 28 12:08 flux_flags_2008_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2142489 Nov 28 12:10 flux_flags_2009_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2142489 Nov 28 12:11 flux_flags_2010_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2142488 Nov 28 12:13 flux_flags_2011_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2148297 Nov 28 12:15 flux_flags_2012_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2142489 Nov 28 12:17 flux_flags_2013_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2142489 Nov 28 12:18 flux_flags_2014_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2142488 Nov 28 12:37 flux_flags_2015_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2148297 Nov 28 12:39 flux_flags_2016_ver.2018.11.28.dat -rw-r--r-- 1 sburns staff 2142489 Nov 28 12:41 flux_flags_2017_ver.2018.11.28.dat ---------------------------------------------------------------------- Date: Thu, 31 Dec 2015 13:30:33 MST To: , cc: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Bcc: data_users From: Sean Burns Subject: Data Update and Photos... Hi All, Just a short note that Bai and Tom have uploaded the most recent US-NR1 AmeriFlux data files (ver.2015.11.10) into the AmeriFlux database and the L2 standardized data files have been posted here: ftp://cdiac.ornl.gov/pub/ameriflux/data/Level2/Sites_ByName/Niwot_Ridge/ Dario has told me that the US-NR1 data should be part of the April 2016 release of the "FLUXNET2015 synthesis dataset". Also, tomorrow will mark the start my 14th year working at the US-NR1 site...it's been a wonderful place to work and I've had the privilege of meeting many interesting people as part of my job...I've had it in the back of my mind to compile a page of photos of the various people I've met at the site...so, here it is: http://urquell.colorado.edu/photos/photos_niwot_people.html This is not meant to be a list of people doing research at the site, but it's simply people that I happen to have a photo of during my years of working up there (and I'm sure I've missed many people!). If you don't like your photo or I'm missing anyone, feel free to send me a replacement photo (the only requirement is that it must be a photo of you at the US-NR1 site, not on the beach in Cancun!)...or, if you want your photo removed or see any mistakes, let me know that too... happy new year! SpB. ps. I've also re-created some webpages to make looking through the photos from past years a bit easier (though the pages with lots of photos might be a bit slow to load?), http://urquell.colorado.edu/photos/photos_2015.html % 741 photos http://urquell.colorado.edu/photos/photos_2014.html % 948 photos http://urquell.colorado.edu/photos/photos_2013.html % 810 photos http://urquell.colorado.edu/photos/photos_2012.html % 608 photos http://urquell.colorado.edu/photos/photos_2011.html % 737 photos http://urquell.colorado.edu/photos/photos_2010.html % 718 photos http://urquell.colorado.edu/photos/photos_2008.html % 910 photos http://urquell.colorado.edu/photos/photos_2008.html % 691 photos http://urquell.colorado.edu/photos/photos_2007.html % 874 photos http://urquell.colorado.edu/photos/photos_2006.html % 1357 photos http://urquell.colorado.edu/photos/photos_2005.html % 1802 photos http://urquell.colorado.edu/photos/photos_2004.html % 1996 photos http://urquell.colorado.edu/photos/photos_2003.html % 870 photos http://urquell.colorado.edu/photos/photos_2002.html % 105 photos http://urquell.colorado.edu/photos/photos_2001.html % 29 photos Grand Total = 13,196 photos... ------------------------------------------------------------------------------ Sean Burns Department of Geography Campus Box 260 University of Colorado Boulder, CO 80309-0260 for FEDex: Guggenheim 110 Internet: sean.burns@colorado.edu http://www2.mmm.ucar.edu/people/burns/ Phone: (303) 497-8934 Fax: (303) 492-8699 ------------------------------------------------------------------------------ ---------------------------------------------------------------------- To: , , , Dario Papale , Deb Agarwal , Gilberto Pastorello , Carlo Trotta , "Eleonora Canfora" , Housen Chu , "Diego Polidori" From: Sean Burns CC: , Peter Blanken , Subject: Updated US-NR1 ameriflux data... Date: Tue, 10 Nov 2015 12:43:49 -0700 Hi All, We have updated the US-NR1 AmeriFlux data (including adding year 2014)...Bai, I just uploaded these data (as a zip file) to the AmeriFlux website and was told the data will reach you that way. The website says "your upload was successful", but I'm not sure the zip file was actually uploaded or not?, ie: http://urquell.colorado.edu/sean/ameriflux_upload.png it shows a green check mark near the description, but there isn't any green check mark near the actual data file...Deb (or someone), can you confirm the zip file was uploaded... I have also posted the data files to our data webpage which is: http://urquell.colorado.edu/data_ameriflux/ All the updated data files (listed at the end of this email) can be downloaded as a single zip file from: http://urquell.colorado.edu/data_ameriflux/data_30min/ameriflux_data_ver.2015.11.10.zip For this release, we did not re-calculate any fluxes from the hi-rate data. The primary objective was to clean-up/correct some descrepancies between years (that many of you have noticed). At the end of this email, I will include a header from the data files that more fully describes the changes/updates we made. I am happy to discuss any of these changes in more detail or provide more information. Also, if you see problems with the data please let me know because I am limited in how much I can check things and I'm sure that I have missed somethings. . .any feedback you give me is extremely helpful...At some point, we will be making a major change to the data-output file-format to be more consistent with the standard ameriflux file structure. As usual, much more information about the data can be found here: http://urquell.colorado.edu/data_ameriflux/docs/ and, if you have a question about a specific date, please refer to the on-line site calendar, ie: http://urquell.colorado.edu/calendar/ If you want to scan an entire year, this can be done with, for example using year 2013 (or pick the year of interest), http://urquell.colorado.edu/calendar/2013.html Finally, if you no longer want to receive these emails, please let me know so I can remove you from the list... cheers, SpB. ------------------------------------------------------------------------------ Sean Burns Department of Geography Campus Box 260 University of Colorado Boulder, CO 80309-0260 for FEDex: Guggenheim 110 Internet: sean.burns@colorado.edu http://www2.mmm.ucar.edu/people/burns/ Phone: (303) 497-8934 Fax: (303) 492-8699 ------------------------------------------------------------------------------ Example File Header: % -- Niwot Ridge Subalpine Forest AmeriFlux Data (site ID: US-NR1) -- % MST Time Period: 2008 01/01 00:00:00 - 2009 01/01 00:00:00, JD 1.000-367.000 (MST) % UTC Time Period: 2008 01/01 07:00:00 - 2009 01/01 07:00:00, JD 1.292-367.292 (UTC) % File Name: flux_2008_ver.2015.11.10.dat % File Created by: Sean Burns (sean.burns@colorado.edu) % File Created for: CU Ameriflux Web Site (http://urquell.colorado.edu/data_ameriflux/) % Date: 10-Nov-2015 % -------- % % Data Version: ver.2015.11.10 % % % NOTES: % % % Info about ver.2015.11.10: % % * Unless noted otherwise, all information listed below for recent % versions also applies to the current version. % % * ver.2015.11.10 includes data from 2014 % % * Changes to data in ver.2015.11.10 were applied to data from all % years (1998-2014). No turbulent fluxes were re-calculated. % % * Rsw_out CNR1 data prior to 2005 have been corrected using a correction % factor of 0.6 (ie, s_Rsw_out_25m_KZ = 0.6*s_Rsw_out_25m_KZ_raw) % % We chose to correct the older CNR1 data based on two inter-comparisons % with the AmeriFlux QA/QC team (Cristoph Thomas in 2006 and Stephen % Chan/Sebastien Biraud in 2013) that showed the recent CNR1 data to be % fairly close to the reference CNR1 they used. % % * in climate_2013_ver.2015.01.28.dat, the barometric pressure had an % incorrect offset applied (this has now been fixed) % % * QA/QC cut-off limits have been adjusted/changed for: % % Qe_21m: Latent Heat Flux % Qh_soil: Soil Heat Flux % Strg_Qh: Sensible Heat Storage % Strg_needle: Needle Heat Storage % % * Erroneous night-time Rppfd_in_25m from 1999-2002 have been fixed % % * Ensured VPD is calculated with 8-m TRH sensor % % * replaced the binary wet_b data with leaf_wet_scaled which is an % average leaf wetness between 0 (dry) and 1 (wet) where values between % 0 and 1 are considered partially-wet % % * Ensured that T_bole is from a consistent sensor depth, this is: % % Fir = 2 cm into bole % Pine = 3 cm into bole % Spruce = 2 cm into bole % % * re-calculated Strg_bole: this is now done using only the pine % trees. It is important to note that due to equipment failures % different trees are sampled for different periods. The trees % sampled are: % % 1 Jan 2004 - 17 July 2006: pine2 and pine3 % 24 Oct 2006 - 31 Dec 2010: pine2, pine3, pine11, pine16 % 1 Jan 2011 - 21 Sep 2015: pine11, pine16 % % * a future data release will include the individual bole temperature % measurements % % * For 2011 on-ward, added a new column to the flux data file which is: % % Qh_Ttc_21m : Sensible Heat Flux using a co-located Thermocouple % % For more details see Burns, et al (2012) "Using sonic anemometer % temperature to measure sensible heat flux in strong winds", Atmos. % Measurement Techniques % % Info about ver.2015.01.30: --------------------------------------------- % % * Bai Yang noticed two issues with ver.2014.12.02 which are corrected % for in ver.2015.01.28: % % - the picarro Deuterium data (dD_picarro) were the delta-O-18 % (d180_picarro) data (this was due to a typo in my code). % % - there were some anomolous Rnet (REBS) data at night. These were % removed and gap-filled with Rnet from the KZ CNR1 sensor % % * even though both these issues were with the climate data files, I % re-created both the flux and climate files so they have a consistent % file name. % % Info about ver.2014.12.02 (notes below also apply to current version): % % * to remove spikes in flux data, applied a very light 5-point median % filter to Fco2_21m_nee_*, Qe_21m, Qh_21m % % * It is recommended that an empirical correction (of around 0.25C) be % applied to the Ta_8m data. The correction has NOT been applied, % but one possible form could be: % % Ta = Ta_raw + T_corr, where T_corr=0.25 degC % % - The correction was determined based on (1) temperature comparisons % with the oregon state prt in Sept 2005, (2) comparisons with % unaspirated thermocouples, (3) comparisons with other temperature % measurements at high WS. % % * a krypton hygrometer is used as the primary latent heat flux (Qe) % instrument; however when the krypton data are missing, an "enhanced" % Qe from the closed-path LI-6262 are used. The enhancement factor % takes into account Qe information lost in the tubing. % % * the tipping bucket Met One precipitation data measured at the % AmeriFlux tower should not be used after 2011. Starting in 2011, we % have replaced the precip data with those from the USCRN Boulder W14 % site (http://www.ncdc.noaa.gov/crn/) which is less than 1km from the % AmeriFlux tower. It should also be noted that the Met One gauge is % unshielded, so winter-time precipitation will have a large undercatch % due to snow blowing past the entrance/opening of the gauge. % % * an empirical correction (of the form T_corr = A*T_raw + B) has been % applied to the 107L raw soil temperature data. The correction % was determined at the NCAR Calibration Lab (EOL) and the result is to % decrease the raw soil temperature by approx 0.2-0.5 degC. % % * the mean co2 data were measured with a tunable diode laser (TDL) % using an inlet at 21.5m on the CU tower. These data are supplied % courtesy of Dave Bowling (david.bowling@utah.edu). To obtain % more information about these data, and to get mean co2 and stable % isotope (del13c) data from other levels on the tower, please visit % the webpage: % % http://www.biology.utah.edu/bowling/ % % * From Nov 2011-present, a vertical profile (8 levels) of water vapor % isotopes was measured with a Picarro l2120-i gas analyzer. Water % vapor dry mole fraction and the isotopic ratio (d18O and dD, reported % relative to VSMOW) from the 24.3m inlet are provided here. The % calibration and sampling protocol closely follows that described in % Berkelhammer et al., (2013), "The nocturnal water cycle in an open % canopy", Journal of Geophysical Research. These data are supplied % courtesy of David Noone (dcn@coas.oregonstate.edu) and Max Berkelhammer % (berkelha@uic.edu). To get more information about these data and % to obtain the data from other tower levels, please contact David % or Max directly. When these data are unavailable, the column is set % to NaN. % % % * For other specific details please see: % % http://urquell.colorado.edu/calendar/ % % http://urquell.colorado.edu/data_ameriflux/docs/ % % % -------- % % Flux Data Files Columns are: % % 1-6. Year, Month, Day, Hour, Minute, Sec -- in MST, Time Stamp Corresponds to center of Averaging Time Period % 07. Decimal Day of Year (MST) % 08. Fco2_21m_nee umol/m2/s 21.5m C02 Flux (NEE = w'co2' + storage flux) CSAT3 Sonic + LI-6262 % 09. Fco2_21m_nee_wust umol/m2/s 21.5m C02 Flux (same as above but w/ ustar filter) CSAT3 Sonic + LI-6262 % 10. Strg_co2 umol/m2/s 0.5-21.5m C02 Canopy Storage LI-COR LI-6251 (or TGA100) % 11. u_w_21m m2/s2 21.5m Momentum Flux (kinematic units) CSAT3 Sonic % 12. Taua_21m kg/m/s2 21.5m Momentum Flux CSAT3 Sonic % 13. Qh_21m W/m2 21.5m Sensible Heat Flux CSAT3 Sonic % 14. Qe_21m W/m2 21.5m Latent Heat Flux CSAT3 Sonic + Krypton Hygrometer (or LI-6262) % 15. w_h2o_21m mmol(H2O)/m2/s 21.5m Water Vapor Flux (same as Qe_21m) CSAT3 Sonic + Krypton Hygrometer % 16. Qh_soil W/m2 0 to -10cm Soil Heat Flux REBS HFT-1 % 17. Strg_Qh W/m2 2m+8m+21.5m Sensible Heat Storage Vaisala HMP-35D % 18. Strg_Qe W/m2 2m+8m+21.5m Latent Heat Storage Vaisala HMP-35D % 19. Strg_bole W/m2 1.5m (3cm depth) Bole Heat Storage (Pine trees) Campbell A3537 (T-type Thermocouples) % 20. Strg_needle W/m2 8m Needle Heat Storage Vaisala HMP-35D % 21. Qh_Ttc_21m W/m2 21.5m Sensible Heat Flux (from Thermocouple) CSAT3 Sonic + E-type Thermocouple % -------- % % % -------- % % Climate Data Files Columns are: % % 1-6. Year, Month, Day, Hour, Minute, Sec -- in MST, Time Stamp Corresponds to center of Averaging Time Period % 07. Decimal Day of Year (MST) % 08. T_21m degC 21.5m Air Temperature Vaisala HMP-35D % 09. RH_21m percent 21.5m Relative Humidity Vaisala HMP-35D % 10. P_bar_12m kPa 12m Barometric Pressure Vaisala PTB-101B % 11. ws_21m m/s 21.5m Wind Speed Campbell Scientific CSAT3 Sonic % 12. wd_21m deg from N 21.5m Wind Direction (from true North) Campbell Scientific CSAT3 Sonic % 13. ustar_21m m/s 21.5m friction velocity Campbell Scientific CSAT3 Sonic % 14. z_L_21m NA 21.5m Stability Parameter Campbell Scientific CSAT3 Sonic % 15. precip_mm mm 10.5m Precipitation Met One Model 385 (or USCNR) % 16. Td_21m degC 21.5m Dewpoint Temperature Vaisala HMP-35D % 17. vpd kPa 8m Vapor Pressure Deficit Vaisala HMP-35D % 18. leaf_wetness 0=dry 1=wet 13.5m Wetness Campbell Model 237 % 19. T_soil degC -5cm Soil Temperature Campbell 107L (thermistor) % 20. T_bole_pine degC 3 cm in bole Pine Bole Temperature Campbell A3537 (T-type Thermocouples) % 21. T_bole_fir degC 2 cm in bole Fir Bole Temperature Campbell A3537 (T-type Thermocouples) % 22. T_bole_spruce degC 2 cm in bole Spruce Bole Temperature Campbell A3537 (T-type Thermocouples) % 23. Rppfd_in_25m umol/m2/s 25.5m Incoming Photosynthetic Active Photon Flux Density (PPFD) LI-COR 190-SA % 24. Rppfd_out_25m umol/m2/s 25.5m Outgoing PPFD LI-COR 190-SA % 25. Rnet_25m_REBS W/m2 25.5m Net Radiation REBS Q-7.1 % 26. Rsw_in_25m_KZ W/m2 25.5m Incoming Shortwave Radiation Kipp and Zonen CNR1 % 27. Rsw_out_25m_KZ W/m2 25.5m Outgoing Shortwave Radiation Kipp and Zonen CNR1 % 28. Rlw_in_25m_KZ W/m2 25.5m Incoming Longwave Radiation Kipp and Zonen CNR1 % 29. Rlw_out_25m_KZ W/m2 25.5m Outgoing Longwave Radiation Kipp and Zonen CNR1 % 30. T_2m degC 2m Air Temperature Vaisala HMP-35D or HMP-45D % 31. T_8m degC 8m Air Temperature Vaisala HMP-35D % 32. RH_2m percent 2m Relative Humidity Vaisala HMP-35D % 33. RH_8m percent 8m Relative Humidity Vaisala HMP-35D % 34. h2o_soil m3/m3 -5cm Volumetric Soil Moisture Campbell CS616 (or CS615) % 35. co2_21m umol/mol 21.5m Carbon Dioxide Mixing Ratio Campbell TGA100 % 36. h2o_picarro mmol/mol 24.3m Water Vapor Mixing Ratio Picarro L2120i % 37. dD_picarro per mil 24.3m Deuterium Picarro L2120i % 38. d180_picarro per mil 24.3m delta-O-18 (ratio of oxygen-18:oxygen-16) Picarro L2120i % -------- % List of Updated Files: ----------------------- -rw-r--r-- 1 sburns aster 1030105 Nov 10 11:34 climate_1998_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6078949 Nov 10 11:35 climate_1999_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6095560 Nov 10 11:38 climate_2000_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6078952 Nov 10 11:40 climate_2001_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6078948 Nov 10 11:43 climate_2002_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6078950 Nov 10 11:45 climate_2003_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6095553 Nov 10 11:48 climate_2004_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6078942 Nov 10 11:50 climate_2005_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6078956 Nov 10 11:53 climate_2006_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6078956 Nov 10 11:55 climate_2007_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6095571 Nov 10 11:58 climate_2008_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6078966 Nov 10 12:00 climate_2009_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6078963 Nov 10 12:03 climate_2010_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6078974 Nov 10 12:05 climate_2011_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6095578 Nov 10 12:09 climate_2012_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6078970 Nov 10 12:12 climate_2013_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 6078965 Nov 10 12:15 climate_2014_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 486717 Nov 10 11:34 climate_flags_1998_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2836049 Nov 10 11:36 climate_flags_1999_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2843778 Nov 10 11:39 climate_flags_2000_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2836050 Nov 10 11:41 climate_flags_2001_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2836050 Nov 10 11:44 climate_flags_2002_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2836050 Nov 10 11:46 climate_flags_2003_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2843778 Nov 10 11:49 climate_flags_2004_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2836049 Nov 10 11:51 climate_flags_2005_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2836050 Nov 10 11:54 climate_flags_2006_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2836049 Nov 10 11:56 climate_flags_2007_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2843777 Nov 10 11:58 climate_flags_2008_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2836049 Nov 10 12:01 climate_flags_2009_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2836050 Nov 10 12:03 climate_flags_2010_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2836048 Nov 10 12:06 climate_flags_2011_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2843776 Nov 10 12:09 climate_flags_2012_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2836050 Nov 10 12:13 climate_flags_2013_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 2836050 Nov 10 12:16 climate_flags_2014_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 529798 Nov 10 11:34 flux_1998_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3097990 Nov 10 11:37 flux_1999_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3106443 Nov 10 11:39 flux_2000_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3097992 Nov 10 11:42 flux_2001_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3097995 Nov 10 11:44 flux_2002_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3097995 Nov 10 11:47 flux_2003_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3106447 Nov 10 11:49 flux_2004_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3097996 Nov 10 11:52 flux_2005_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3097998 Nov 10 11:54 flux_2006_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3097997 Nov 10 11:56 flux_2007_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3106448 Nov 10 11:59 flux_2008_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3098003 Nov 10 12:01 flux_2009_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3097992 Nov 10 12:04 flux_2010_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3097994 Nov 10 12:07 flux_2011_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3106444 Nov 10 12:10 flux_2012_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3097988 Nov 10 12:13 flux_2013_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 3097999 Nov 10 12:16 flux_2014_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 339474 Nov 10 11:35 flux_flags_1998_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1959191 Nov 10 11:37 flux_flags_1999_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1964525 Nov 10 11:40 flux_flags_2000_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1959197 Nov 10 11:42 flux_flags_2001_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1959197 Nov 10 11:45 flux_flags_2002_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1959197 Nov 10 11:47 flux_flags_2003_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1964525 Nov 10 11:50 flux_flags_2004_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1959197 Nov 10 11:52 flux_flags_2005_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1959197 Nov 10 11:55 flux_flags_2006_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1959197 Nov 10 11:57 flux_flags_2007_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1964525 Nov 10 11:59 flux_flags_2008_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1959197 Nov 10 12:02 flux_flags_2009_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1959197 Nov 10 12:04 flux_flags_2010_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1959196 Nov 10 12:08 flux_flags_2011_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1964525 Nov 10 12:11 flux_flags_2012_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1959197 Nov 10 12:14 flux_flags_2013_ver.2015.11.10.dat -rw-r--r-- 1 sburns aster 1959197 Nov 10 12:17 flux_flags_2014_ver.2015.11.10.dat ---------------------------------------------------------------------- Date: Fri, 27 Feb 2015 12:26:25 MST To: ameriflux@lbl.gov, bodenta@ornl.gov, yangb@ornl.gov, blanken@colorado.edu cc: sean.burns@colorado.edu From: "Sean Burns" Subject: Re: 2013 Niwot Ridge AmeriFlux data... Hi All, Just a quick update: In early January Bai Yang noticed two problems with the 2013 climate data that were posted on Dec 2 2013...the issues were: (1) the dD_picarro data were duplicates of the d180_picarro data (2) the Rnet REBS 2013 data had some strange night-time values. Last month I removed the old files, ie: -rw-r--r-- 1 sburns aster 6072850 Dec 2 10:12 climate_2013_ver.2014.12.02.dat -rw-r--r-- 1 sburns aster 2742074 Dec 2 10:12 climate_flags_2013_ver.2014.12.02.dat -rw-r--r-- 1 sburns aster 2916498 Dec 2 10:13 flux_2013_ver.2014.12.02.dat -rw-r--r-- 1 sburns aster 1865213 Dec 2 10:14 flux_flags_2013_ver.2014.12.02.dat And replace them with new files which are: -rw-r--r-- 1 sburns aster 6074033 Jan 28 08:24 climate_2013_ver.2015.01.28.dat -rw-r--r-- 1 sburns aster 2743259 Jan 28 08:25 climate_flags_2013_ver.2015.01.28.dat -rw-r--r-- 1 sburns aster 2917681 Jan 28 08:25 flux_2013_ver.2015.01.28.dat -rw-r--r-- 1 sburns aster 1866398 Jan 28 08:26 flux_flags_2013_ver.2015.01.28.dat These files should fix problems (1) and (2) listed above. Note, that the flux data files should be exactly the same as the old ones, but I re-created and posted the flux files so that the version number is consistent with the climate files. If you have the old files, it would be best to delete them and get the new ones. Bai is using the new files for his processing and archiving. thanks & apologies for any confusion... SpB. ---------------------------------------------------------------------- Date: Tue, 02 Dec 2014 10:56:01 MST To: ameriflux@lbl.gov, bodenta@ornl.gov, yangb@ornl.gov cc: sean.burns@colorado.edu, blanken@colorado.edu From: "Sean Burns" Subject: 2013 Niwot Ridge AmeriFlux data... Hi All, the 2013 climate and flux data from the Niwot Ridge AmeriFlux site are now posted at: http://urquell.colorado.edu/data_ameriflux/ The new data files are: -rw-r--r-- 1 sburns aster 6072850 Dec 2 10:12 climate_2013_ver.2014.12.02.dat -rw-r--r-- 1 sburns aster 2742074 Dec 2 10:12 climate_flags_2013_ver.2014.12.02.dat -rw-r--r-- 1 sburns aster 2916498 Dec 2 10:13 flux_2013_ver.2014.12.02.dat -rw-r--r-- 1 sburns aster 1865213 Dec 2 10:14 flux_flags_2013_ver.2014.12.02.dat see the header in each file for additional details. The header from the climate data files is also attached at the end of this email. Tom & Bai, please upload these data to your archive whenever you have a chance....or, if I should contact someone else about putting these data into the AmeriFlux archive, please let me know. One significant addition/change is that we added three variables from a Picarro running at the site by David Noone and Max Berkelhammer to the climate file (see data header for details). For info about past data releases please see: http://urquell.colorado.edu/data_ameriflux/docs/niwot_ridge_AmeriFlux_data_email_updates.txt I have also listed some of the important instrument issues and highlights from 2013 here: http://urquell.colorado.edu/data_ameriflux/docs/ReadME_notes_2013.txt Photos compiled from 2013 can be found here: http://urquell.colorado.edu/photos/photos_2013.html % covers Jan-Dec (810 photos) There are several issues with older data that need to be fixed and we plan to do this before (or at the same time) as the 2014 data release. A few of these issues are: * the Met One tipping bucket precipitation gauge stopped working in March, 2013 and was repaired (but not re-calibrated) in Sept 2013. However, we have noticed that the Met One precipitation started showing signs of bias/problems sometime in early 2011...we recommend using precip data from LTER C-1 (http://niwot.colorado.edu/) or the USCRN Boulder 14W (Hills Mills) site (http://www.ncdc.noaa.gov/crn/) rather than the Met One data (thanks to Ethan for suggesting the USCRN data). Both of the LTER and USCRN sites are within a km of the AmeriFlux tower..here is a plot that compares the warm season precip over several years: http://urquell.colorado.edu/sean/precip_comparison_nr1_lter_uscrn.png we also note that the Met One gauge is unshielded so under-catch in winter is an additional problem (USCRN has a SDFIR fence around the gauge). For the 2013 climate data (climate_2013_ver.2014.12.02.dat), we have replaced the Met One precip data with those from USCRN. In our next data release/update, we will likely add a new precip column with the USCRN data from previous years (if this is what AmeriFlux prefers as oppsed to "gap-filling" the Met One data). * the 2012 CO2 storage term needs to be gap-filled. * several people have noticed a distinct change in Rnet from the KZ CNR1 sensor before and after 2005 (there is a gap in the data because we changed instruments). This issue is related to a change in the outgoing shortwave radiation, ie: http://urquell.colorado.edu/sean/p_yearly_Rsw_out_25m_KZ.png in Fall 2005 a new CNR1 sensor was bought and put on the tower...the AmeriFlux QA/QC group performed a side-by-side sensor comparison in July 2006 which showed outgoing shortwave from our CNR1 sensor agreed well with the comparison CNR1 sensor...so, this gives us a bit more confidence in the post-2005 values. We plan to perform an empirical correction/adjustment to make the pre-2005 CNR1 data match better to the later CNR1 data. * There are several issues with flagging that need to be fixed (thanks to Loren for pointing some of these issues out): - fix the flagging for ustar, ie: http://urquell.colorado.edu/data_ameriflux/docs/email_fix_to_nee_flag_for_ver2011.04.20.txt - the momentum flux "Taua_21m" flag is incorrect...this is happening because we calculate u'w' (and do all the quality control on that). - there are fewer flagged periods for Fco2_21m_nee than Qh_21m. This issue needs to be looked at more carefully. There may be periods when NEE is gap-filled, but the flag is not correct. (this issue is likely related to the fact that NEE comes from two variables..the vertical flux and the storage). * we are also considering to re-do of the format of the shared data files...the considerations are: - output the 21.5m vertical co2 flux (ie, w'co2'), either in addtion to NEE or in place of NEE. - combining the "climate" and "flux" data files into a single file - using a flagging system that is consistent across all variables (and hopefully easier to use). - ouput data from redundant sensors as individual columns/variables rather than outputting variables combined from multiple sensors with flags (e.g., heat flux using a co-located thermocouple as well as sonic temperature or latent heat from both the LI-6262 and krypton hygrometer). Perhaps this can be done in addition to a combined variable. Finally, we again ask that if the tower data are used in a paper or report to please give proper acknowledgement..something along the lines of: "The University of Colorado Niwot Ridge AmeriFlux site is supported by the U.S. Department of Energy (DOE) AmeriFlux Management Project (AMP) and data were provided by Peter Blanken and Sean Burns." We would very much like to compile a list of papers which use the AmeriFlux tower/site data...many of these publications are already listed on the main AmeriFlux webpages for Niwot Ridge, ie: http://ameriflux.ornl.gov/fullsiteinfo.php?sid=34 http://ameriflux-data.lbl.gov:8080/SitePages/siteInfo.aspx?US-NR1 letting us know about a new publication helps us to keep track of how the data are being used, justify operation of the tower, etc. If you have any other questions or comments or would like to be removed from this mailing list, please let me know... cheers, SpB. ------------------------------------------------------------------------------ Sean Burns Department of Geography Campus Box 260 University of Colorado Boulder, CO 80309-0260 for FEDex: Guggenheim 110 Internet: sean.burns@colorado.edu http://www.mmm.ucar.edu/people/burns/ Phone: (303) 497-8934 Fax: (303) 492-8699 ------------------------------------------------------------------------------ Header of 2013 data file: ========================= % -- Niwot Ridge Ameriflux Data -- % MST Time Period: 2013 01/01 00:00:00 - 2014 01/01 00:00:00, JD 1.000-366.000 (MST) % UTC Time Period: 2013 01/01 07:00:00 - 2014 01/01 07:00:00, JD 1.292-366.292 (UTC) % File Name: climate_2013_ver.2014.12.02.dat % File Created by: Sean Burns (sean.burns@colorado.edu) % File Created for: CU Ameriflux Web Site (http://urquell.colorado.edu/data_ameriflux/) % Date: 02-Dec-2014 % -------- % % Data Version: ver.2014.12.02 % % Info about ver.2014.12.02: % % % NOTES: % % * to remove spikes in flux data, applied a very light 5-point median % filter to Fco2_21m_nee_*, Qe_21m, Qh_21m % % * It is recommended that an empirical correction (of around 0.25C) be % applied to the Ta_8m data. The correction has NOT been applied, % but one possible form could be: % % Ta = Ta_raw + T_corr, where T_corr=0.25 degC % % - The correction was determined based on (1) temperature comparisons % with the oregon state prt in Sept 2005, (2) comparisons with % unaspirated thermocouples, (3) comparisons with other temperature % measurements at high WS. % % * a krypton hygrometer is used as the primary latent heat flux (Qe) % instrument; however when the krypton data are missing, an "enhanced" % Qe from the closed-path LI-6262 are used. The enhancement factor % takes into account Qe information lost in the tubing. % % * the tipping bucket Met One precipitation data measured at the % AmeriFlux tower should not be used after 2011. For the 2013 data, we % have replaced the precip data with those from the USCRN Boulder W14 % site (http://www.ncdc.noaa.gov/crn/) which is less than 1km from the % AmeriFlux tower. It should also be noted that the Met One gauge is % unshielded, so winter-time precipitation will have a large undercatch % due to snow blowing past the entrance/opening of the gauge. We will % consider adding a new precip column with USCRN data in the next data % release. % % * an empirical correction (of the form T_corr = A*T_raw + B) has been % applied to the 107L raw soil temperature data. The correction % was determined at the NCAR Calibration Lab (EOL) and the result is to % decrease the raw soil temperature by approx 0.2-0.5 degC. % % * the mean co2 data were measured with a tunable diode laser (TDL) % using an inlet at 21.5m on the CU tower. These data are supplied % courtesy of Dave Bowling (david.bowling@utah.edu). To obtain % more information about these data, and to get mean co2 and stable % isotope (del13c) data from other levels on the tower, please visit % the webpage: % % http://www.biology.utah.edu/bowling/ % % * From Nov 2011-present, a vertical profile (8 levels) of water vapor % isotopes was measured with a Picarro l2120-i gas analyzer. Water % vapor dry mole fraction and the isotopic ratio (d18O and dD, reported % relative to VSMOW) from the 24.3m inlet are provided here. The % calibration and sampling protocol closely follows that described in % Berkelhammer et al., (2013), "The nocturnal water cycle in an open % canopy", Journal of Geophysical Research. These data are supplied % courtesy of David Noone (dcn@coas.oregonstate.edu) and Max Berkelhammer % (berkelha@uic.edu). To get more information about these data and % to obtain the data from other tower levels, please contact David % or Max directly. % % % * For other specific details please see: % % http://urquell.colorado.edu/calendar/ % % http://urquell.colorado.edu/data_ameriflux/docs/ % % % -------- % % Columns are: % % 1-6. Year, Month, Day, Hour, Minute, Sec -- in MST, Time Stamp Corresponds to center of Averaging Time Period % 07. Decimal Day of Year (MST) % 08. T_21m degC 21.5m Air Temperature Vaisala HMP-35D % 09. RH_21m percent 21.5m Relative Humidity Vaisala HMP-35D % 10. P_bar_12m kPa 12m Barometric Pressure Vaisala PTB-101B % 11. ws_21m m/s 21.5m Wind Speed Campbell Scientific CSAT-3 Sonic % 12. wd_21m deg from N 21.5m Wind Direction (from true North) Campbell Scientific CSAT-3 Sonic % 13. ustar_21m m/s 21.5m friction velocity Campbell Scientific CSAT-3 Sonic % 14. z_L_21m NA 21.5m Stability Parameter Campbell Scientific CSAT-3 Sonic % 15. precip_mm mm 10.5m Precipitation Met One Model 385 (or USCRN Precip Data) % 16. Td_21m degC 21.5m Dewpoint Temperature Vaisala HMP-35D % 17. vpd kPa 8m Vapor Pressure Deficit Vaisala HMP-35D % 18. wet_b 0=dry 1=wet 13.5m Wetness Campbell Model 237 % 19. T_soil degC -5cm Soil Temperature Campbell 107L (thermistor) % 20. T_bole_pine degC ~3cm in bole Pine Bole Temperature Campbell A3537 (T-type Thermocouples) % 21. T_bole_fir degC ~3cm in bole Fir Bole Temperature Campbell A3537 (T-type Thermocouples) % 22. T_bole_spruce degC ~3cm in bole Spruce Bole Temperature Campbell A3537 (T-type Thermocouples) % 23. Rppfd_in_25m umol/m2/s 25.5m Incoming Photosynthetic Active Photon Flux Density (PPFD) Licor 190-SA % 24. Rppfd_out_25m umol/m2/s 25.5m Outgoing PPFD Licor 190-SA % 25. Rnet_25m_REBS W/m2 25.5m Net Radiation Rebs Q7.1 % 26. Rsw_in_25m_KZ W/m2 25.5m Incoming Shortwave Radiation Kipp and Zonen CNR1 or CM21 % 27. Rsw_out_25m_KZ W/m2 25.5m Outgoing Shortwave Radiation Kipp and Zonen CNR1 % 28. Rlw_in_25m_KZ W/m2 25.5m Incoming Longwave Radiation Kipp and Zonen CNR1 % 29. Rlw_out_25m_KZ W/m2 25.5m Outgoing Longwave Radiation Kipp and Zonen CNR1 % 30. T_2m degC 2m Air Temperature Vaisala HMP-35D or HMP-45D % 31. T_8m degC 8m Air Temperature Vaisala HMP-35D % 32. RH_2m percent 2m Relative Humidity Vaisala HMP-35D % 33. RH_8m percent 8m Relative Humidity Vaisala HMP-35D % 34. h2o_soil m3/m3 -5cm Volumetric Soil Moisture Campbell CS-616 % 35. co2_21m ppm 21.5m Carbon Dioxide Concentration Campbell TGA-100 % 36. h2o_picarro mmol/mol 24.3m Water Vapor Mixing Ratio Picarro L2120i % 37. dD_picarro per mil 24.3m Deuterium Picarro L2120i % 38. d180_picarro per mil 24.3m delta-O-18 (ratio of oxygen-18:oxygen-16) Picarro L2120i % -------- % ---------------------------------------------------------------------- Date: Thu, 28 Feb 2013 15:29:34 MST To: ameriflux@lbl.gov, bodenta@ornl.gov, yangb@ornl.gov cc: sean.burns@colorado.edu, blanken@colorado.edu From: Sean Burns Subject: 2012 Data from Niwot Ridge AmeriFlux site... Hi All, the 2012 climate and flux data from the Niwot Ridge AmeriFlux site are now posted at: http://urquell.colorado.edu/data_ameriflux/ The new data files are: -rw-r--r-- 1 sburns aster 5560093 Feb 28 10:23 climate_2012_ver.2013.02.28.dat -rw-r--r-- 1 sburns aster 2747664 Feb 28 10:23 climate_flags_2012_ver.2013.02.28.dat -rw-r--r-- 1 sburns aster 2922572 Feb 28 10:24 flux_2012_ver.2013.02.28.dat -rw-r--r-- 1 sburns aster 1868405 Feb 28 10:24 flux_flags_2012_ver.2013.02.28.dat Tom & Bai, please upload these data to your archive whenever you have a chance.... Photos compiled from the past several years can be found at (note: these pages can be a bit slow to load): http://urquell.colorado.edu/photos/photos_2012.html % covers Jan-Dec (608 photos) http://urquell.colorado.edu/photos/photos_2011.html % covers Jan-Dec (737 photos) http://urquell.colorado.edu/photos/photos_2010.html % covers Jan-Dec (718 photos) The photos from individual days can also be accessed from the site calendar, ie: http://urquell.colorado.edu/calendar/ If you see anything strange in the data, this calendar is a good place to check for information about what was happening on a specific date... Also, as an archive of the history of the data processing and/or changes to the data over the past several years here is a file with emails that contain such details: http://urquell.colorado.edu/data_ameriflux/docs/niwot_ridge_AmeriFlux_data_email_updates.txt If you are new to this dataset, I suggest reading through the niwot_ridge_AmeriFlux_data_email_updates.txt file to get more details and some history about these data... If you want to be removed from this email list and/or notice any data problems or have questions please let me know.... thanks! SpB. ------------------------------------------------------------------------------ Sean Burns Department of Geography Campus Box 260 University of Colorado Boulder, CO 80309-0260 for FEDex: Guggenheim 110 Internet: sean.burns@colorado.edu http://www.mmm.ucar.edu/people/burns/ Phone: (303) 497-8934 Fax: (303) 492-8699 ------------------------------------------------------------------------------ ---------------------------------------------------------------------- Date: Mon, 12 Mar 2012 16:07:13 MDT To: sean.burns@colorado.edu From: Sean Burns Subject: 2011 Data from AmeriFlux Tower... Hi, the 2011 climate/flux data from the AmeriFlux tower are now posted at: http://urquell.colorado.edu/data_ameriflux/ These files are: -rw-r--r-- 1 sburns aster 5544780 Mar 12 15:40 climate_2011_ver.2012.03.12.dat -rw-r--r-- 1 sburns aster 2740020 Mar 12 15:40 climate_flags_2011_ver.2012.03.12.dat -rw-r--r-- 1 sburns aster 2914452 Mar 12 15:41 flux_2011_ver.2012.03.12.dat -rw-r--r-- 1 sburns aster 1863158 Mar 12 15:41 flux_flags_2011_ver.2012.03.12.dat Also, if the AmeriFlux tower data are used in a paper or report we would like to request that the following acknowledgement be added. . . something like: "Data from the University of Colorado Niwot Ridge subalpine forest AmeriFlux tower were provided by Peter Blanken and Sean Burns and are supported by a grant from the National Science Foundation (NSF) Long-Term Research in Environmental Biology (LTREB)." We are also trying to compile a list of papers that have used these data...if you could email me the title/journal/etc that have used these data I would appreciate it (I don't need a pdf, just a title)... If anyone has any questions or notices any problems with the data files please let me know. Or, if you want to be removed from these email updates let me know that too. Tom and Bai, feel free to add these files to your data archive... thanks! SpB. ---------------------------------------------------------------------- Date: Wed, 20 Apr 2011 17:10:19 MDT To: sean.burns@Colorado.EDU cc: russell.monson@Colorado.EDU, laura.scott@Colorado.EDU, nicole.trahan@Colorado.EDU, amy.m.watson@Colorado.EDU, lynette.laffea@Colorado.EDU, lindsay.young@Colorado.EDU, allyson.eller@Colorado.EDU From: Sean Burns Subject: Release of Updated CU AmeriFlux Data... Hi All, We have updated the climate and flux datafiles collected from the Niwot Ridge Subalpine Forest AmeriFlux tower (for the years 1998-2010)...as many of you know, last year we found a bug in the code that calculated the co2 fluxes (both a dilution and WPL correction were used)....the co2 flux data in this release have been corrected for this bug as well as several other items (see list below). After correcting the co2 fluxes, the annual NEE uptake by the forest approximately doubles....here is an example: http://urquell.colorado.edu/sean/plots_interyearly/plots_fluxes/p_Fco2_2001.png The new data are available at: http://urquell.colorado.edu/data_ameriflux/data_30min/ and all the files can be downloaded from a single zip file at: http://urquell.colorado.edu/data_ameriflux/data_30min/ameriflux_data_ver.2011.04.20.zip I'll list all the new data files below as well as information from a data file header which details all the changes made with this new data release... if anyone has any questions or notices any problems with these data files please let me know (or if you want to be removed from these email updates let me know that too). Tom and Bai, please use these files to update the data in your archive... thanks! SpB. Header Info: % % Current Data Version: ver.2011.04.16 % % Updates and Changes from ver 3.0 (11 Aug 2009) to ver.2011.04.16: % % * Heat, water vapor, and co2 fluxes are recalculated from the hi-rate % data. NOTE: a bug was found in the software that calculated the % previous version of the co2 fluxes (the co2 flux was "double- % corrected" for the effect of water vapor, i.e., both a dilution and % WPL correction were applied). With the new co2 fluxes, the forest is % about twice as large a co2 sink (over a year) as previously thought. % % * closed-path co2 and water vapor fluxes are now calculated using a % lag-time that varies with time. Also, the lag for h2o is now about % 0.4 sec longer than the one used for co2. % % * a krypton hygrometer is used as the primary latent heat flux (Qe) % instrument; however when the krypton data are missing, an "enhanced" % Qe from the closed-path LI-6262 are used. The enhancement factor % takes into account Qe information lost in the tubing. % % * for periods in 2008-2010 the sensible heat flux (Qh) is calculated % from a thermocouple near the csat rather than using the csat/sonic % temperature (this is because there was a problem with the csat). % % * decreased the measured barometric pressure by 0.76 kPa (based on % comparisons with other pressure sensors). Correction is: % % P_baro = P_baro_raw + P_corr, where P_corr=-0.76 kPa % % * z/L has been recalculated using the appropriate form of Qh % % * the sign of the momentum flux has been corrected so that: % flux_mom=-1.*rho.*u_w_21m. % % * a consistent empirical gap-filling technique has been applied to flux % data from all years % % * the planar-fit has now been applied to the early years. Also, planar % fit coefficients are allowed to vary/change with time (i.e., to take % into account when the sonic has been moved and re-deployed) % % * Wind Direction (wd_21m) has been recalculated for all years. % % * Scalar wind speed (ws_21m) is used for all years (previously 1998 % and most of 1999 used the vector wind speed). % % * VPD is now calculated using the 8m T/RH rather than the 21.5m T/RH. % (this is supposed to simulate the VPD within the needles, so it is % more appropriate to use the T/RH that is near the canopy) % % * Percent Absorbed PPFD is no longer part of the climate data files, % this has been replaced by the outgoing PPFD data, Rppfd_out_25m % % * A flag for Rppfd_out_25m has been added: % % 23. Rppfd_out_2 Outgoing PPFD Flag % % while the two flags: % % 23. Rppfd_in_mo PPFD Model fit from Rnet Flag % 24. Rppfd_abs_2 Percent Absorbed PPFD Flag % % have been removed (see the header of the climate flag data file for % more details) % % * A consistent flag-nomenclature is now used for all flag variables % (the exceptions are: Qe_21m_flag, Energy Balance, Stationarity, % and the Inegral Stats flags---see header of flux flag file for % % % Updates and Changes from Version 2.1 to 3.0 (11 Aug 2009): % * checked for any RH values over 100 % recalculated VPD with the new RH values. % * checked that nighttime PAR > 0 % * re-did the ustar filter for Fco2_21m_nee_wust. see info at: % http://urquell.colorado.edu/data_ameriflux/docs/ustar.txt % * to remove spikes in flux data, applied a very light 5-point median % filter to Fco2_21m_nee_*, Qe_21m, Qh_21m % % Updates and Changes from Version 2.0 to 2.1 (11 Mar 2008): % * changed the time stamp to the CENTER of the averaging period % (previously the time stamp was at the START of the 30-min time % period) % % Updates and Changes from Version 1.1 to 2.0 (4 May 2005): % * replaced 960 missing Tsoil data with "optimized-fit" data % (provided by Bill Sacks) % * replaced bad value for s_P_bar_12m at day = 314.3229 % % Updates and Changes from Version 1.0 to 1.1 (20 Jul 2004): % * recalculate vpd % * use local standard time (MST) for the time stamp % (previous data versions used a combination of MST and MDT) % * add decimal day of year (column 7) % % NOTES: % File Listing: -rw-r--r-- 1 sburns aster 938469 Apr 20 09:38 climate_1998_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 5550426 Apr 20 09:39 climate_1999_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 5564340 Apr 20 09:41 climate_2000_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 5549409 Apr 20 09:43 climate_2001_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 5549326 Apr 20 09:45 climate_2002_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 5549167 Apr 20 09:47 climate_2003_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 5564483 Apr 20 09:50 climate_2004_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 5549790 Apr 20 09:52 climate_2005_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 5550973 Apr 20 09:54 climate_2006_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 5550422 Apr 20 09:56 climate_2007_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 5565631 Apr 20 09:58 climate_2008_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 5549672 Apr 20 10:00 climate_2009_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 5549669 Apr 20 10:02 climate_2010_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 496958 Apr 20 09:38 flux_1998_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2920102 Apr 20 09:40 flux_1999_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2926813 Apr 20 09:42 flux_2000_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2919081 Apr 20 09:44 flux_2001_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2919000 Apr 20 09:46 flux_2002_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2918845 Apr 20 09:48 flux_2003_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2926975 Apr 20 09:51 flux_2004_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2919471 Apr 20 09:53 flux_2005_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2920658 Apr 20 09:55 flux_2006_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2920105 Apr 20 09:57 flux_2007_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2928108 Apr 20 09:59 flux_2008_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2919350 Apr 20 10:01 flux_2009_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2919345 Apr 20 10:03 flux_2010_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 468431 Apr 20 09:38 climate_flags_1998_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2745668 Apr 20 09:40 climate_flags_1999_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2751896 Apr 20 09:42 climate_flags_2000_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2744645 Apr 20 09:44 climate_flags_2001_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2744566 Apr 20 09:46 climate_flags_2002_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2744408 Apr 20 09:48 climate_flags_2003_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2752054 Apr 20 09:50 climate_flags_2004_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2745039 Apr 20 09:52 climate_flags_2005_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2746225 Apr 20 09:54 climate_flags_2006_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2745671 Apr 20 09:56 climate_flags_2007_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2753195 Apr 20 09:58 climate_flags_2008_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2744917 Apr 20 10:00 climate_flags_2009_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 2744918 Apr 20 10:02 climate_flags_2010_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 321180 Apr 20 09:38 flux_flags_1998_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 1868803 Apr 20 09:41 flux_flags_1999_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 1872635 Apr 20 09:43 flux_flags_2000_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 1867784 Apr 20 09:45 flux_flags_2001_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 1867705 Apr 20 09:47 flux_flags_2002_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 1867547 Apr 20 09:49 flux_flags_2003_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 1872793 Apr 20 09:51 flux_flags_2004_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 1868179 Apr 20 09:53 flux_flags_2005_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 1869364 Apr 20 09:55 flux_flags_2006_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 1868811 Apr 20 09:57 flux_flags_2007_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 1873935 Apr 20 09:59 flux_flags_2008_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 1868057 Apr 20 10:01 flux_flags_2009_ver.2011.04.20.dat -rw-r--r-- 1 sburns aster 1868057 Apr 20 10:03 flux_flags_2010_ver.2011.04.20.dat ---------------------------------------------------------------------- Date: Tue, 08 Jun 2010 14:19:22 MDT To: "Yang, Bai" cc: sean.burns@Colorado.EDU, bodenta@ornl.gov From: Sean Burns Subject: Re: New LaThuile dataset... Hi Bai/Tom, I have uploaded a new version of the 2008 flux data files....the only change I've made is to the sensible heat flux in Nov/Dec 2008. The new files are: http://urquell.colorado.edu/data_ameriflux/data_30min/flux_2008_ver.2010.06.08.dat http://urquell.colorado.edu/data_ameriflux/data_30min/flux_flags_2008_ver.2010.06.08.dat this might not be the final solution to the problem, but I think it's an improvement over the previous version. note, i'm now starting to use the new file-naming scheme where the date the file is created is part of the file name...if you have any problems or see anything else wrong please let me know... thanks! SpB. ---------------------------------------------------------------------- Date: Tue, 11 Aug 2009 03:26:38 MDT To: russell.monson@Colorado.EDU, laura.scott@Colorado.EDU, nicole.trahan@Colorado.EDU, amy.m.watson@Colorado.EDU, stanfield.lee@Colorado.EDU, lynette.laffea@Colorado.EDU, Diego.Riveros-iregui@Colorado.EDU, dolores.asensio@Colorado.EDU, lindsay.l.young@gmail.com, ryan.a.weaver@Colorado.EDU cc: sean.burns@Colorado.EDU From: Sean Burns Subject: Updates to Niwot AmeriFlux data... Hi All, fyi---the CU/Monson AmeriFlux data from 1998-2007 have been updated to version 3.0. Also the 2008 have been added (version 1.0). For full details about the changes see the header of each data file (the header also contains the date and version of the data file)....you can access these data at: http://urquell.colorado.edu/data_ameriflux/ if you have any questions or see any problems please let me know... thanks, SpB. ------------------------------------------------------ Sean Burns Department of Ecology and Evolutionary Biology (EEB) Campus Box 334 University of Colorado Boulder, CO 80309-0334 for FEDex: Ramaley Building, Room N122 Internet: sean.burns@colorado.edu http://www.mmm.ucar.edu/people/burns/ Phone: (303) 492-5796 Fax: (303) 492-8699 ------------------------------------------------------- ---------------------------------------------------------------------- To: russell.monson@colorado.edu, laura.scott@colorado.edu, jia.hu@colorado.edu, nicole.trahan@colorado.edu, lynette.laffea@colorado.edu, Diego.Riveros-iregui@colorado.edu Subject: Updates to Monson/AmeriFlux Data.... Date: Thu, 05 Mar 2009 14:28:36 -0700 From: "Sean Burns" Hi All, Attached below is an update about the Monson Niwot Ridge Ameriflux data...if you want to be removed from this email list just let me know and i'll take you off....i hope to have a "final" 2008 data and updates to previous years available sometime in the May/June time frame.... thanks, SpB. - ------------------------------------------------------------------------------ Sean Burns Department of Ecology and Evolutionary Biology (EEB) Campus Box 334 University of Colorado Boulder, CO 80309-0334 for FEDex: Ramaley Building, Room N122 Internet: sean.burns@colorado.edu http://www.mmm.ucar.edu/people/burns/ Phone: (303) 492-5796 Fax: (303) 492-8699 - ------------------------------------------------------------------------------ Updates to report about the CU/Monson AmeriFlux data. 1. Photos from 2008 are on-line in one spot. these are: http://urquell.colorado.edu/photos/photos_2008a.html % covers Jan-Jul (365 photos) http://urquell.colorado.edu/photos/photos_2008b.html % covers Aug-Dec (326 photos) photos from previous years are: http://urquell.colorado.edu/photos/photos_2007a.html % covers Jan-Jun (552 photos) http://urquell.colorado.edu/photos/photos_2007b.html % covers Jul-Dec (319 photos) http://urquell.colorado.edu/photos/photos_2006a.html % covers Jan-Jun (553 photos) http://urquell.colorado.edu/photos/photos_2006b.html % covers Jul-Aug (544 photos) http://urquell.colorado.edu/photos/photos_2005a.html % covers Jan-Apr (683 photos) http://urquell.colorado.edu/photos/photos_2005b.html % covers May-Jul (563 photos) http://urquell.colorado.edu/photos/photos_2005c.html % covers Aug-Dec (556 photos) http://urquell.colorado.edu/photos/photos_2004a.html % covers Jan-Apr (662 photos) http://urquell.colorado.edu/photos/photos_2004b.html % covers May-Aug (728 photos) http://urquell.colorado.edu/photos/photos_2004c.html % covers May-Aug (606 photos) http://urquell.colorado.edu/photos/photos_2003.html % covers Apr-Dec (870 photos) total number of photos from 2003-2008= 7,327 2. Forestcam photos. All the forestcam photos from 2008 are on one page...it's: http://urquell.colorado.edu/forestcam/webcam_2008.html 3. A preliminary version of the 2008 data is available at: http://urquell.colorado.edu/data_ameriflux_test/data_30min_monthlyfiles/ the files are: - -rw-r--r-- 1 sburns 5559060 Mar 4 16:41 climate_2008.dat - -rw-r--r-- 1 sburns 2834554 Mar 4 16:46 climate_flags_2008.dat - -rw-r--r-- 1 sburns 2919559 Mar 4 16:49 flux_2008.dat - -rw-r--r-- 1 sburns 1865378 Mar 4 16:53 flux_flags_2008.dat note, i have not updated the "soil_2008.dat" data file yet...we added more sensors in Sept and moved some of the existing sensors. I am still thinking about the best way to incorporate these in...i think it might be easiest to create a new file with the new sensors and leave the old file in more-or-less the same format....if anyone sees a major problem with these data let me know. Also, I noticed that the old "soil_YYYY.dat" files had a reduced resolution for the soil moisture...so I will update all the old files with the next major data update (which will be sometime in May). 4. In looking over the "ustar correction" from past years, there appears to be some inconsistencies. I won't get into whether or not the ustar correction is appropriate or not, because this is a separate issue (eg, see Acevedo, et al 2009 for a discussion about this). For the years 2004-2007, the ustar-correction was not applied in the winter....it's windy in the winter so ustar is typically not low, but this still makes a small difference. For the 2002 data, the coefficients used to do the ustar-correction were unusually large..this made the ustar-corrected data too large and had a significant impact the NEE for that year....SO, to make the data more consistent from year-to-year we decided to use a simple scheme for the correction...one set of coefficients in the winter and a different set in the summer. What we are using is: Equation: F_co2= A*exp(B*T.soil) For fall/winter (days 1-140 and 273-366), A=1.07; B=0.108; For spring/summer (days 141-272), A=1.35; B=0.086; A more rigorous method such as that by Gu, et al, 2005 could be used and we might change to that at a later date (of course anyone can do this themselves, if they are so-inclined). For now, this is an improvement over what currently exists. And i believe that Bai Yang and Dario Papale, etc are going to do their own ustar-correction-method for the "level4" data files available through the ameriflux webpage, ie: ftp://cdiac.ornl.gov/pub/ameriflux/data/Level3/Sites_ByName/Niwot_Ridge/ ...Because we are going to update the older flux data I was also planning to take this opportunity to clean up some of the spikes which exist in the older data following procedures in Papale D, et al, 2006 or something similar to that. However, the effect of the "despiking" should be somewhat small....so that will not be implemented until the final data release. For anyone that is actively working with co2 NEE data I have updated data that use a consistent ustar filter for each year on the web at: http://urquell.colorado.edu/data_ameriflux_test/ the files are: - -rw-r--r-- 1 sburns 647028 Mar 5 09:58 niwot_NEE_fixed_1999.csv - -rw-r--r-- 1 sburns 649481 Mar 5 09:59 niwot_NEE_fixed_2000.csv - -rw-r--r-- 1 sburns 648423 Mar 5 09:59 niwot_NEE_fixed_2001.csv - -rw-r--r-- 1 sburns 629704 Mar 5 10:00 niwot_NEE_fixed_2002.csv - -rw-r--r-- 1 sburns 629782 Mar 5 10:00 niwot_NEE_fixed_2003.csv - -rw-r--r-- 1 sburns 630058 Mar 5 10:00 niwot_NEE_fixed_2004.csv - -rw-r--r-- 1 sburns 627483 Mar 5 10:01 niwot_NEE_fixed_2005.csv - -rw-r--r-- 1 sburns 696531 Mar 5 10:01 niwot_NEE_fixed_2006.csv - -rw-r--r-- 1 sburns 696557 Mar 5 10:02 niwot_NEE_fixed_2007.csv the columns in each file are: where the columns are: day s_Fco2_21m_nee year mo day hr min sec of year no ustar with ustar 2007, 1, 1, 4, 45, 0, 1.1979, 0.97524, 0.97524 2007, 1, 1, 5, 15, 0, 1.2188, 0.48794, 0.48794 2007, 1, 1, 5, 45, 0, 1.2396, 0.8703, 0.8703 2007, 1, 1, 6, 15, 0, 1.2604, -0.19222, -0.19222 so column 8 should correspond to what you have in your current data file (as the non-ustar corrected co2 "nee" flux)....and column 9 is the "new" ustar-filtered co2_nee data. If you are not actively working on these data I would suggest that you wait until the final files are released....if you are working actively on something it may be a good idea to check and see how these changes affect your results. And here are the values for each year: NEE [gC m-2], (summed from 1 Jan - 31 Dec) year no_ustar ustar (new) ustar (old) effect of ustar filter - ----- -------- ---------- -------- --------------------- 1999 -160.73 -87.95 -88.48 72.78 2000 -117.76 -48.60 -48.83 69.16 2001 -142.76 -78.30 -82.95 64.46 2002 -107.95 -41.66 -20.73 66.29 2003 -95.89 -52.94 -67.10 42.95 2004 -91.43 -57.38 -62.20 34.05 2005 -112.66 -69.41 -88.01 43.25 2006 -129.49 -95.35 -104.36 34.14 2007 -123.13 -89.28 -97.85 33.85 2008 -120.53 -97.66 -97.66 22.87 the thing that i'm a bit puzzled over is why the effect of the ustar filter was realively larger in early years compared to the past several years...something subtle is probably happening here. For anyone interested, here are more plots and discussion about this: - ----------------------Further details/plots about ustar stuff: The main plot about the ustar-filtering is: http://urquell.colorado.edu/sean/plots_interyearly/plot_ustarfilter.html the upper row of 3-panel plots are: - difference of ustar-filtered NEE and non-filtered - cumulative nee over the year - the difference between ustar-filtered NEE - non-filtered (for both the "old" and "new" fit-coefficients. the lower row of 2-panel plots are related to the equation, F_co2 = A*exp(B*T.soil) and are: - the "A" coefficient - the "B" coefficient for the years 1999-2002 the difference between ustar-filtered and non-filtered is not zero for ustar > 0.2. I'm not sure why this is happening, but it will require re-processing the raw hi-rate data which is a long-term goal, but is not going to happen before next year. Also, a plot of the A/B data for each year is: http://urquell.colorado.edu/sean/plots_interyearly/plot_A_B_allyears.pdf this is probably the plot that shows most clearly the changes in the A/B values with time. Note that the black lines are what was used previously (see high A value for 2002), the blue lines are from the "sliding window" fit to the data, and the red lines are what we are using as the "new" coefficients. These also seems to be a distinct change in the sliding window values for the years 2006-2008 compared to earlier years....this coincides with changing our "reference" soil temperature sensor...but I'm not sure if it's the reason for this change... References: - ----------- Acevedo OC, Moraes OLL, Degrazia GA, et al. 2009: Is friction velocity the most appropriate scale for correcting nocturnal carbon dioxide fluxes?, Agricultural And Forest Meteorology, 149, 1-10. Gu, et al, 2005: Objective threshold determination for nighttime eddy flux filtering, Agricultural And Forest Meteorology, 128, 179-197. Papale D, Reichstein M, Aubinet M, et al. 2006: Towards a standardized processing of Net Ecosystem Exchange measured with eddy covariance technique: algorithms and uncertainty estimation, BIOGEOSCIENCES, 3, 571-583. ---------------------------------------------------------------------- Date: Tue, 11 Mar 2008 17:07:42 MDT To: sean.burns@colorado.edu From: "Sean Burns" Subject: Updates to CU/Monson AmeriFlux data, biological data, etc. Hi All, fyi---the 2006 and 2007 CU/Monson 30-min "climate" and "flux" data files are now available. In addition, the 2003/2004 soil temperature data (within the climate data files) has been updated (see header of the 2003 and 2004 "climate" data files for details). The updated soil temperature data can be up to several degC smaller than the raw data (in the summer). So, if absolute soil temperature is important to what you are doing, you might want to re-download the updated data. Data can be accessed via: http://urquell.colorado.edu/data_ameriflux/ The new data files are: -rw-r--r-- 1 sburns 5544437 Mar 10 16:20 climate_2006.dat -rw-r--r-- 1 sburns 2827380 Mar 10 16:21 climate_flags_2006.dat -rw-r--r-- 1 sburns 2911586 Mar 10 16:22 flux_2006.dat -rw-r--r-- 1 sburns 1860291 Mar 10 16:22 flux_flags_2006.dat -rw-r--r-- 1 sburns 5543886 Mar 10 16:29 climate_2007.dat -rw-r--r-- 1 sburns 2826826 Mar 10 16:30 climate_flags_2007.dat -rw-r--r-- 1 sburns 2911583 Mar 10 16:31 flux_2007.dat -rw-r--r-- 1 sburns 1860291 Mar 10 16:32 flux_flags_2007.dat We have also updated the README file which is: http://urquell.colorado.edu/data_ameriflux/docs/Readme1st.pdf And Jeff Beauregard (with input from Maggie and Jia and others) compiled the "biological" data spreadsheet which is: http://urquell.colorado.edu/data_ameriflux/docs/AmeriFlux_Biological_Data_LTER_NWT1.xls A few more notes about the 2006-7 climate/flux data: 1. time stamp is now in the center of the avg period. (previously it was at the start of the 30-min period). With the time stamp in the center of the avg period, there is no need to add or subtract to the "day of year" time stamp to align them to "true" time...this change has been made to all the data files from all years. 2. mean co2 at 21.5m measured by dave bowlings tunable diode laser are included in 2006/2007 climate data files. For more laser co2 (and d13co2) data go to: http://www.biology.utah.edu/bowling/research/niwot/nwt_public_data/nwt_public_data.html 3. new gap-filling technique for Qe, Qh, and Fco2 were used in the 2006/2007 data. (this was mostly due to dealing with large data gaps in 2006 (power outage in late April) and 2007 (hard drive failure on Dec 20th). 4. More detailed info about the gap-filling of the individual climate and flux parameters is in: http://urquell.colorado.edu/sean/data_stats_2006/ http://urquell.colorado.edu/sean/data_stats_2007/ 5. monthly data files are no longer being created; only year-long files. If anyone sees problems in the data or has questions (or wants to be removed from this email list) let me know...Tom, if we need to make any changes to the spreadsheet let us know---we will check out the L4 level data from past years within the next month or so (and also look at the 2006/7 L4 data whenever they might be available)... thanks, SpB. ---------------------------------------------------------------------- Date: Mon, 10 Mar 2008 17:07:34 MDT To: russell.monson@colorado.edu, jia.hu@colorado.edu, lynette.laffea@colorado.edu, nicole.trahan@colorado.edu, jeffrey.beauregard@colorado.edu, maggie.prater@colorado.edu, marissa.hamed@colorado.edu, amy.trowbridge@colorado.edu, michael.wilkinson@colorado.edu, erin.brown@colorado.edu, stanfield.lee@colorado.edu, sierra.lovestowell@colorado.edu cc: sean.burns@colorado.edu, bowling@biology.utah.edu, molotch@seas.ucla.edu From: "Sean Burns" Subject: CU Tower 2006/2007 tower data... Hi, fyi---the "final" version of the CU Tower data on the web at: http://urquell.colorado.edu/data_ameriflux_test/ the data files are: -rw-r--r-- 1 sburns 5544437 Mar 10 16:20 climate_2006.dat -rw-r--r-- 1 sburns 2827380 Mar 10 16:21 climate_flags_2006.dat -rw-r--r-- 1 sburns 2911586 Mar 10 16:22 flux_2006.dat -rw-r--r-- 1 sburns 1860291 Mar 10 16:22 flux_flags_2006.dat -rw-r--r-- 1 sburns 5543886 Mar 10 16:29 climate_2007.dat -rw-r--r-- 1 sburns 2826826 Mar 10 16:30 climate_flags_2007.dat -rw-r--r-- 1 sburns 2911583 Mar 10 16:31 flux_2007.dat -rw-r--r-- 1 sburns 1860291 Mar 10 16:32 flux_flags_2007.dat as usual, look in the header for details about the data within each file. a few notes/changes: 1. time stamp is now in the center of the avg period. (previously it was at the start of the 30-min period). With the time stamp in the center of the avg period, there is no need to add or subtract to the time stamp to align them to "true" time...this was something that i always found a bit annoying in the old data format so i'm doing away with it. (older data files will be updated sometime soon). 2. mean 21.5m co2 data from dave bowlings laser are included. 3. new gap-filling technique for Qe, Qh, and Fco2. (this was mostly due to dealing with large data gaps in 2006 (power outage in late April) and 2007 (hard drive failure on Dec 20th). 4. no more monthly data files; only year-long files. 5. there is a "biological" summary that Jeff organized and put together with help from others in the lab (this was requested by AmeriFlux). This is available at: http://urquell.colorado.edu/data_ameriflux/docs/AmeriFlux_Biological_Data_LTER_NWT1.xls http://urquell.colorado.edu/data_ameriflux/docs/AmeriFlux_Biological_Data_Submission_Guidelines.doc If anyone has any comments or corrections to what's in this spreadsheet please let us know... I'll be moving the data files to our "official" webpage on Wednesday and emailing AmeriFlux about them at that time..if anyone has any comments or sees any problems in these data please let me know...unless, there are problems, these data will not change again (at least not anytime soon). thanks, SpB. ---------------------------------------------------------------------- Date: Sat, 29 Apr 2006 14:50:49 MDT To: russell.monson@Colorado.EDU, todd.rosenstiel@Colorado.EDU, laura.scott@Colorado.EDU, chuixiang.yi@Colorado.EDU, jia.hu@Colorado.EDU, michael.weintraub@Colorado.EDU, lynette.laffea@Colorado.EDU, jcmonical@hotmail.com, peter.casey@Colorado.EDU, nicole.trahan@Colorado.EDU, dmoore1@ucar.edu, kelly.sensecqua@Colorado.EDU, jeffrey.beauregard@Colorado.EDU, Maggie.Prater@Colorado.EDU cc: sean.burns@Colorado.EDU From: "Sean Burns" Subject: 2005 CU Ameriflux Data... Hi, fyi--I added the 2005 30-min data to the CU ameriflux webpage: http://urquell.colorado.edu/data_ameriflux/ unless i made some mistake these are the final data...i still have a few small updates to do to the data from prev years (mostly impacting the soil temperature). also, I'm meeting an electrician on Monday at MRS at 10am to try and get the power going at the tower again. Jeff or Kelly, if you are available to go to the site on MOnday please let me know---I'm leaving from Boulder at around 9am (not sure when I will return)---this would be a good chance for you to learn what to do in case the power goes out at the tower (and I'm not around). It also might be useful for us to have an extra person up there...If you are busy with finals/classes/etc then don't worry about this (i can't recall when finals start)...but if you are available please let me know. thanks, SpB.