Field Notes

Hill Slough: 2021-11-18 08:30:00 (DOY 322)
Author: Daphne Szutu
Others: Dennis, Robert

Summary: Regular data collection/cleaning, close to low tide, dew on sensors, 7700 thermocouple broken--fixed, changed eddy clock +2min

2021-11-18
Hill Slough

Dennis, Robert, and I arrived at 8:30 PST. It was a chilly and foggy day but calm. The water level was near low tide. The staff gauge read 4.28ft at 8:40 PST. The bottom of the staff gauge is at 4â€™, so the water was only .28â€™ (8.5cm) above the ground level. The eosGP and miniDOT were both still underwater.

I downloaded met, camera, and USB GHG data. The eosGP sensors has been maxed out at 1% since it was installed. This is a new sensor so there shouldn't be anything wrong with it.

We replaced the 7700 thermocouple which we noticed last time was broken. Joe had repaired a Licor thermocouple assemblyâ€”it worked, which is great because we no longer need to pay 0/thermocouple.

Robert and Dennis cleaned flux and rad sensors. All the sensors were wet with dew. The wash reservoir was Â½ full; we refilled it.

I changed the eddy clock from 8:47 to 8:49 and re-started logging afterwards.

LI-7500 readings:
CO2 465ppm
H2O 475ppm
T 9.6C
P 102.2kPa
SS 96 --> 100 after cleaning
LI7700 readings:
CH4 2.2ppm after TC swap
RSSI 0 --> 78 after cleaning

We left at 9:05 PST. We drove through thick fog on the way along Hwy 12 to Bouldin Island. It looked nice against the green rolling hills.

4 photos found

20211118HS_LowTide1.jpg ( 2021-11-18 08:35:57 ) Full size: 1920x1440
Daphne on site. Wetland is close to low tide.