Field Notes

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Gilbert Tract: 2023-11-28 10:00:00 (DOY 332)
Author: Daphne Szutu
Others: Robert

Summary: Site visit after Antioch HS outreach event, swapped eosGP, error downloading ADCP but ok after restart, water sensors need to be lowered

2023-11-28
Gilbert Tract

Robert and I arrived at 10:00 PST after our morning visit with Dennis to Antioch HS. It was another beautiful fall day—sunny and crisp. The wetland is continuing to senesce. It was near low tide and the water level was rising. The staff gauge read 51cm near 10:20 PST. The irrigation system turned on shortly after we arrived. There was a bunch of irrigation pipe at the end of the road near the channel so they must be working on something.

It’s been three weeks since our last visit. This site was due last week, but we ran out of daylight to finish all of the sites. I downloaded met, cam, and USB GHG data. I changed the eddy clock +1min from 10:10 to 10:11 PST to match the laptop time and restarted logging. Robert cleaned flux and rad sensors. The wash reservoir was almost empty; we refilled it.

I walked out on the boardwalk pier to measure surface water conductivity.

Sample, Temperature-compensated conductivity, Sample temperature, Time
Surface, 450uS, 7.2 degC, 11:00 PST

There were two pollywogs on the boardwalk, dead after being marooned there with an ebbing tide. I replaced the dissolved CO2 sensor eosGP since it has been giving noisy data for a few weeks. I removed sn GP20210002 (0-2% probe) and installed sn GP20160117 (0-1% probe) at the same depth. When the staff gauge read 52cm, the water sensors were about 35cm below the water surface. I wasn’t sure if the new sensor was working at first, because the reading was ~100 mV. I pulled the sensor out of the water and the reading went down to near 0. Then I blew into the sensor and the reading spiked up as expected. I left the new sensor there and I’ll check the data next time.

I checked the conductivity sensor as parts of its routine check every 3 months and because its data has been looking weird with conductivity dropping low every night (Never mind—I think the conductivity sensor was coming out of the water during low tide and that’s why the data looked bad. I’ll lower the sensors next time; we probably stepped on the water sensor cables at some point which brought the sensors closer to the water surface.) This conductivity interface A547 has the broken temperature. The conductivity orifice looked clean.

We went to the channel to download Flo’s data and ran into two CDFW people checking camera traps, I assume for nutria. At the ADCP, I rest the clock and downloaded the data, but there was an “Error opening file,” shortly after I started the download. I power-cycled the ADCP and restarted the SL software. I re-downloaded the data and all seemed fine. I restarted data logging and we left around 11:25 PST.

0 photos found

7 sets found

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