Field Notes

East End: 2024-01-18 13:50:00 (DOY 18)
Author: Daphne Szutu
Others: Arman

Summary: Swapped 7500 for calibration, measured surface water conductivity

2024-01-18
East End

Arman and I arrived at 13:50 PST after a wait for one-way traffic control over Threemile Slough bridge. It was cool, breezy, and overcast. The staff gauge read 63.5cm. The reservoir was 75% full; Arman refilled it.

Arman cleaned flux and rad sensors and I showed him how to swap the 7500 for calibration. The head mount wouldn't untwist from the vertical bar, so he had to unscrew the sensor from the mount. One of the washers worked to catch the bolt, but the other washer is funky and doesn't catch as expected, but Arman caught the bolt before it dropped in the water. sn 75H-2180 came off and sn 75H-2182 went on.

I downloaded met, cam, and USB GHG data. I uploaded the new 7500 config file and updated the pressure coefficients. I changed the eddy clock +30sec from 14:08 to 14:08:30 PST to match the laptop time and restarted logging.

I checked the conductivity sensor as part of its routine check every 3 months. Its orifice was clear.

2180 dirty read: 441ppm CO2, 530mmol/m3 H2O, 13.7C, 101.7kPa, 99SS
2180 clean read: 443ppm CO2, 516mmol/m3 H2O, 13.7C, 101.7kPa, 100SS
2182 fresh read: 447ppm CO2, 513mmol/m3 H2O, 13.5C, 101.7kPa, 97SS
The 7700 read: 2.18ppm CH4, 53RSSI – 82 after cleaning

We measured the surface water conductivity with the handheld YSI probe.
Sample, temperature-compensated conductivity, temperature
Surface, 7.64 uS, 6.9 degC

We left at 14:15 PST.

0 photos found

11 sets found

14 EE_met graphs found