------------------------------------------------------------------------- % -- Niwot Ridge Subalpine Forest AmeriFlux Data (site ID: US-NR1) -- % % File Name: niwot_USNR1_Ttc_YYYY.csv % File Created by: Sean Burns (sean.burns@colorado.edu) % File Created for: urquell website % Date: 24-Sep-2026 % -------- % % The vertical profile of the thermocouple data from the US-NR1 % AmeriFlux tower is available at: % % https://urquell.colorado.edu/data_ameriflux/data_supplemental/data_thermocouple_profile/ % % the data files are: % % -rw-r--r--. 2706092 Sep 24 10:28 niwot_USNR1_Ttc_2004.csv % -rw-r--r--. 2696851 Sep 24 10:28 niwot_USNR1_Ttc_2005.csv % -rw-r--r--. 2782617 Sep 24 10:28 niwot_USNR1_Ttc_2006.csv % -rw-r--r--. 2681721 Sep 24 10:29 niwot_USNR1_Ttc_2007.csv % -rw-r--r--. 2891962 Sep 24 10:29 niwot_USNR1_Ttc_2008.csv % -rw-r--r--. 2886318 Sep 24 10:29 niwot_USNR1_Ttc_2009.csv % -rw-r--r--. 2888239 Sep 24 10:29 niwot_USNR1_Ttc_2010.csv % -rw-r--r--. 2914025 Sep 24 10:29 niwot_USNR1_Ttc_2011.csv % -rw-r--r--. 2902855 Sep 24 10:29 niwot_USNR1_Ttc_2012.csv % -rw-r--r--. 2933301 Sep 24 10:29 niwot_USNR1_Ttc_2013.csv % -rw-r--r--. 2902102 Sep 24 10:30 niwot_USNR1_Ttc_2014.csv % -rw-r--r--. 2902006 Sep 24 10:30 niwot_USNR1_Ttc_2015.csv % -rw-r--r--. 2911298 Sep 24 10:30 niwot_USNR1_Ttc_2016.csv % -rw-r--r--. 2811247 Sep 24 10:30 niwot_USNR1_Ttc_2017.csv % -rw-r--r--. 2819483 Sep 24 10:31 niwot_USNR1_Ttc_2018.csv % -rw-r--r--. 2818714 Sep 24 10:31 niwot_USNR1_Ttc_2019.csv % -rw-r--r--. 2715862 Sep 24 10:31 niwot_USNR1_Ttc_2020.csv % -rw-r--r--. 2707514 Sep 24 10:31 niwot_USNR1_Ttc_2021.csv % -rw-r--r--. 2741422 Sep 24 10:31 niwot_USNR1_Ttc_2022.csv % -rw-r--r--. 2703058 Sep 24 10:32 niwot_USNR1_Ttc_2023.csv % -rw-r--r--. 2685295 Sep 24 10:32 niwot_USNR1_Ttc_2024.csv % -rw-r--r--. 2689479 Sep 24 10:32 niwot_USNR1_Ttc_2025.csv % % Notes: % % * The reference to use for the thermocouple data is: % % Burns, S.P., P.D. Blanken, A.A. Turnipseed, J. Hu, and R.K. Monson, % 2015: The influence of warm-season precipitation on the diel cycle of % the surface energy balance and carbon dioxide at a Colorado subalpine % forest site. Biogeosciences, 12, 7349--7377, % https://doi.org/10.5194/bg-12-7349-2015 % % * the thermocouples were originally setup in summer of 2003 in collaboration % with Jielun Sun from NCAR. Jielun kindly donated these thermocouples and the % CR23X data logger (NCTC logger) to the US-NR1 site. % % Installation Notes: % % Tuesday, September 23rd, 2003 Visit: % ------------------------------------ % At the site : SpB % % * Straightend up the Thermocouples...new hts (measured from the ground): % % Niwot Thermocouples: % % Nom.Ht logger % (m) channel Note/Change.... % ----- ------- -------------------- % 22 12 not changed % 19 10 Old Location ~ 31cm below current ht. % 16 11 Old Location ~ 57cm below level. % 13 9 about the same (no sag) % 10 4 Old Location, sag ~ 10cm % 8 3 Old Location, sag ~ 5cm % 6 2 New ht. ~ 590cm (same as old) % 4 6 Old ht. ~ 396cm (adj to 400cm) % 2 5 Old ht. ~ 186.5cm (adj to 200cm) % 1.46 1 not changed % 0.96 7 not changed % 0.49 8 not changed % % Also, % % Tuesday, September 30th, 2003 Visit: % ------------------------------------ % At the site : SpB, BB % % (Nominal) % ht logger Measured Ht % (m) channel (cm) % ----- ------- ----------- % 22 12 2198 % 19 10 1950 (old level is ~31cm below current) % 16 11 1650 (old level is ~57cm below new level) % 13 9 1298 % 10 4 993 (saggin ~10 cm) % 8 3 806 (sagging ~ 5cm) % 6 2 592 % 4 6 396 % 2 5 186.5 --> adjusted to 200 cm % 1.46 1 138 % 0.96 7 90 --> adjusted to 91cm % 0.49 8 45 (sagging to ~ 36cm) % % * other details (and photos) of the thermocouples can be found % on the US-NR1 calendar and logbook webpages: % % https://urquell.colorado.edu/calendar/ % % https://urquell.colorado.edu/logbook/type_site_visit_entries.html % % * the heights of each sensor for years 2004-2025 is: % % 40cm 91cm 138cm 200cm 396cm 592cm 806cm 993cm 1298cm 1650cm 1950cm 2198cm % % * It is important to realize that the thermocouple temperature is % NOT the same as air temperature (due to radiative effects on % the thermocouple measurements). The thermocouple temperature is % close to the air temperature, but they are not equivalent. Also % the error will not be constant with elevation (depending on wind % speed, radiation reaching the sensor, etc). No correction has been % applied for radiation errors. % % -------- % % 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. Rsw_in_25m_KZ W/m2 25.5m Incoming Shortwave Radiation Kipp and Zonen CNR1 % 09. Ta_21m degC 21.5m Aspirated Air Temperature Vaisala HMP-35D % 10. RH_21m percent 21.5m Relative Humidity Vaisala HMP-35D % 11. T_tc degC 0.40m Thermocouple Temperature type-E, 0.254 DIA Bare wire. % 12. T_tc degC 0.91m Thermocouple Temperature type-E, 0.254 DIA Bare wire. % 13. T_tc degC 1.38m Thermocouple Temperature type-E, 0.254 DIA Bare wire. % 14. T_tc degC 2.00m Thermocouple Temperature type-E, 0.254 DIA Bare wire. % 15. T_tc degC 3.96m Thermocouple Temperature type-E, 0.254 DIA Bare wire. % 16. T_tc degC 5.92m Thermocouple Temperature type-E, 0.254 DIA Bare wire. % 17. T_tc degC 8.06m Thermocouple Temperature type-E, 0.254 DIA Bare wire. % 18. T_tc degC 9.93m Thermocouple Temperature type-E, 0.254 DIA Bare wire. % 19. T_tc degC 12.98m Thermocouple Temperature type-E, 0.254 DIA Bare wire. % 20. T_tc degC 16.50m Thermocouple Temperature type-E, 0.254 DIA Bare wire. % 21. T_tc degC 19.50m Thermocouple Temperature type-E, 0.254 DIA Bare wire. % 22. T_tc degC 21.98m Thermocouple Temperature type-E, 0.254 DIA Bare wire. % -------- % % * Missing data are set to NaN. % % * the number of missing samples for each year and level is: % % 40cm 91cm 138cm 200cm 396cm 592cm 806cm 993cm 1298cm 1650cm 1950cm 2198cm % 2004: 6 6 6 6 6 6 6 8 6 6 6 6 % 2005: 13 13 13 13 13 13 13 13 13 13 13 2751 % 2006: 619 4016 619 619 619 619 619 619 619 619 619 619 % 2007: 870 7274 870 871 872 871 871 871 870 870 870 870 % 2008: 4 4 4 4 4 4 651 4 5 4 4 4 % 2009: 0 179 0 0 0 0 0 0 0 0 0 0 % 2010: 0 1590 0 0 0 0 0 0 0 0 0 0 % 2011: 0 746 0 0 0 0 0 0 0 1 0 0 % 2012: 0 0 0 0 0 0 0 0 0 825 1 0 % 2013: 0 0 0 0 0 0 0 0 0 0 0 0 % 2014: 18 18 20 17 18 19 128 21 17 17 19 17 % 2015: 45 6 6 6 6 6 278 6 6 902 6 6 % 2016: 0 0 0 0 0 0 3524 1 966 149 0 0 % 2017: 0 115 0 0 0 0 7605 8284 0 5509 0 0 % 2018: 0 0 0 0 0 0 0 9578 0 10631 0 0 % 2019: 25 119 0 0 0 0 1827 3840 39 16553 0 0 % 2020: 146 86 0 0 0 0 17548 0 5975 17568 0 0 % 2021: 185 428 1 1 1 2 17484 6106 3331 14756 1 1 % 2022: 10 5129 0 0 1 1 17495 518 7456 5769 0 0 % 2023: 112 832 0 1 3 2 17456 0 10131 14092 0 0 % 2024: 19 11 11 11 11 11 17568 11 17568 11696 11 11 % 2025: 4 7 0 0 0 0 17520 5 17520 6616 0 0 %