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August

2025

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27

JD208

28

JD209
at 1:10 MST, network connection to US-NR1 site is down (ok to C-1)

SpB Returns

29

JD210
network connection to US-NR1 site is down all day (ok to C-1)

HR Returns

30

JD211
Site Visit (HR): Details, HR Photos (11)

Span cylinder: 350 psi, N2: 1650 psi

rebooted radio modem at tower, bypassed white timer device and pluged modem power supply directly into outlet. Network connection restored.

LI-7500a CO2 signal strength at 0.0. Could indicate "contaminated optics". Pictures of LI-7500 connection and diagnostics screens included and will reach out to LI-COR about it.

HR's jeep

sunny, ~12C, isolated storms by noon MDT

31

JD212

1

JD213

2

JD214
In the AM, the 21.5m LI-7500RS starts working again

3

JD215

4

JD216
Site visit (HR, BK, MR; CSU: DB, RE, AB, HL): Details , HR Photos (3)

span cylinder: 50 psi, N2: 1700 psi

emptied pluvios at 10:50 MDT

*Xcel was doing powerline work and shut power off at/above C-1 from 8:00-16:00 MDT*

after power came back on, isffa rebooted, but missing two channels (UCB logger and NCTC logger)

DB installed CRNS on SW corner of N canopy tower

HR's jeep

sunny, ~20C, calm

SpB Off

5

JD217

6

JD218
Site visit (HR): Details , HR Photos (11)

span cylinder: 50 psi, N2: 1700 psi

replaced span cylinder ff66936 with ff66921

replaced UCB battery and maintainer with the spares in the shed

at 10:30 MST, fully plugged blue serial cable back into NCTC so it can connect to the data system

at 12:00 MST, UCB logger reconnected to isffa

at 12:00 MST, the 2.5m CSAT3 stops sending data



HR's jeep

hot and windy

7

JD219

8

JD220

9

JD221

10

JD222

11

JD223

12

JD224

13

JD225
SpB Returns

14

JD226

15

JD227

16

JD228

17

JD229

18

JD230

19

JD231

20

JD232
at 8:00 MDT, reboot of urquell

21

JD233
Site Visit (SpB, HR, AB): SpB Details , SpB Photos (26) , HR Details

span cylinder: 1900 psi, N2: 1600 psi

organized cylinders at tower, in shed, and in C-1 trailer. See gas cylinder info

swapped LI-7200 inlet

hard restart (unplugged and plugged back in) of 2.5m CSAT3

Enterprise SUV (by SpB)

hot and windy, afternoon rainstorms

Site visit by AB/SM

22

JD234

23

JD235

from 8:30-9:30 MST, PB brought ~20 GEOG grad students and faculty to tower for GEOG new grad student orientation

overcast/foggy

24

JD236

25

JD237

26

JD238

27

JD239

28

JD240
at around 7:00 MST, the LI-7200 CO2/H2O go off-scale (flow rate issue?)

Lab Meeting at 14:00 MDT

29

JD241
between around 6:45-11 MST, lost contact with the US-NR1 site (a network switch near Blackhawk failed)

30

JD242