Site visit reports for US-NR1 AmeriFlux Tower:
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Thursday, July 10, 2025

Weather: warm, sunny, breezy, isolated rainstoms in the afternoon

1. Record gas cylinder pressures
   * CO2 span: 1100 psi
   * N2: 1850 psi

2. Download data from loggers
   * CNR CR23x
	-Notes: skipped due to wind and storm
   * CNRB CR23x
	-Notes: skipped due to wind and storms
   * AR CR800
	-Notes: skipped due to wind and storms
   * PRF CR23x
	-Notes: downloaded doy 162-191
   * MET CR23x
	-Notes: downloaded doy 162-191
   * NCTC CR23x
	-Notes: downloaded doy 162-191
   * AP200 CR1000
	-Notes: downloaded doy 162-191
   * UCB CR23x
	-Notes: downloaded doy 162-191
   * Bowling CR1000
	-Notes: still haven't setup connection in LoggerNe
   * SOIL CR23x
	-Notes: downloaded doy 170-19
   * TC CR23x
	-Notes: downloaded doy 162-191

3. Additional tasks
   * AP200 LI-850 replacement:
	- Original CO2 reading: -444 ppm, H2O: 20-25 (units?). Disconnected AP-200 from power at 10:35 MDT. Removed LI-850 from enclosure to check if optical source was working. Had to power it all back up at 11:00 MDT for ~30 sec to check the source (part #2208-0044). The light was blinking, but according to LI-COR tech support, it can still blink and be on the way out since it's a filament IR bulb. We replaced the optical source (part #0509-11112) and new readings were; CO2: 920-940 ppm, H2O: 20-25 (units?). LI-COR tech support says the LI-850 now needs a manual zero and span. 
   * PB refilled both grounding tubes with salt water

4. Additional notes
   * did not clean the KH2O due to weather
   * will bring cylinders to snowshed next week when driving up to C1
   * need to replace board in Como Creek bridge before September AGU Chapman meeting
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Thursday, June 19, 2025

see: (add link to pdf)
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Wednesday, June 11, 2025

see: <a href="https://urquell.colorado.edu/calendar/site_visit_report_250611.pdf">
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Thursday, May 29, 2025

see: (add link to pdf)
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