Field Notes

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Gilbert Tract: 2024-06-18 09:00:00 (DOY 170)
Author: Daphne Szutu
Others: Kyle, Charlie

Summary: Smoky air, low tide, removed bad dissolved CO2 sensor, replaced dfPAR motor

2024-06-18
Gilbert Tract

Kyle, Charlie, and I arrived at 9:00 PST (10:00 PDT). Kyle came in her own car because she was recovering from a cold. The air smelled and looked smoky and the light had that vaguely yellow color—probably from the Point Fire near Healdsburg or maybe the Sites fire in Colusa County. It was breezy, warm and, and mostly sunny with scattered cirrus clouds. There was our usual grackle screeching at us from the top of the telephone pole.

Charlie is an undergraduate student in Rob Rhew’s lab who came along today for more field experience—he has been incubating GT soil cores in the lab and measuring their fluxes with changing water levels.

A bunch of cows were gathered together on the western edge of Burroughs Parcel and were eventually driven south along the road. Not sure where to.

It was near low tide and the water level read 30cm at 9:20 PST.

Kyle got in the water to remove the bad eosGP sensor. She reported that the bottom of the water sensors were about 10-15cm below the water surface (we didn’t have a tape measure today so had to estimate). She put the Campbell conductivity sensor and HYDROS21 CTD sensor back in the same position.

I downloaded met, cam, and USB GHG data. I changed the eddy clock +1:30min from 9:16 to 9:17:30 to match the laptop time and restarted logging. I downloaded the Song Meter Micro data, swapped its desiccant, and synched its clock and location by pairing it with my phone. Kyle and Charlie cleaned flux and rad sensors, topped off the wash reservoir, downloaded miniDOT data (swapped desiccant), and measured surface water conductivity.

Sample, temperature-compensated conductivity, temperature
Surface, 239 uS, 20.1 C

I replaced the dfPAR motor, which hasn’t been working consistently since mid-May. I replaced the 0.5rpm motor with a 2rpm motor with a motor control board. Conveniently, my Campbell screwdriver fit perfectly in the the allen head set screw, so I could remove the shadowband without an additional tool. The motor is only attached to the enclosure with one screw for now. I couldn’t quite reach the second screw, and left the screw inside the enclosure. I’ll try again next time. I adjusted the dial on the board until the motor was spinning about 0.5rpm. Afterwards, the dfPAR and totPAR data seemed reasonable.

The 7500 read: 411ppm CO2, 408mol/m3 H2O, 25.2C, 100.9kPa, 98SS – 99 after cleaning
The 7700 read: 2.15ppm CH4, 32RSSI – 81 after cleaning

We got to the channel around 10:05 PST (11:05 PDT). The water level was low and we saw 1 swan and 1 egret in the channel. Kyle downloaded the ADCP data, reset its clock, and restarted data collection. Charlie and I took turns digging up prickly shrubs by our ADCP enclosure.

We left at 10:20 PST (11:20 PDT).

0 photos found

8 sets found

Can't check MBWPEESWGT_mixed
Can't check MBEEWPSWEPGT_cam
16 GT_met graphs found