Field Notes

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Other sites visited today: Bouldin Corn | Bouldin Alfalfa | Hill Slough
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Gilbert Tract: 2023-04-11 08:30:00 (DOY 101)
Author: Daphne Szutu
Others: Dennis, Robert, Kyle

Summary: Knightsen field trip, data collection/cleaning, swapped 7500 for calibration, gave QSE calibration solution to USGS

2023-04-11
Gilbert Tract

Dennis, Robert, Kyle, and I arrived around 8:30 PDT to meet with about sixty 5th graders from Knightsen and Old River schools. We hosted them for a field trip, walking up and down along the eastern levee of Gilbert Tract. We talked about tidal flows in the estuary, how water conductivity changes across the estuary, the carbon cycle, peat soil, and tower sensors. Tides were high in the morning and the boardwalk into the wetland was slightly submerged. By late morning the water level had come down so a few students were able to walk out onto the boardwalk. The field trip wrapped up around 11:00 PDT and Dennis, Robert, and Kyle headed home. I stayed to download data here and a few other sites today. It’s an off-cycle visit since I will be out of town next week.

James and Audrey from USGS came by the tower shortly after 11:00 PDT. I gave them a 1L bottle of QSE standard for them to calibrate our fDOM sensor. They had pulled their EXO previously and had calibrated everything except fDOM in the lab. Today they planned to calibrate fDOM sensor and deploy the whole EXO today.

I started at the tower around 11:10 PDT. It was mild, partly cloudy, and breezy. Some more reeds are coming up, especially around the edges of patches. Some of the green tules are >2m tall, but most of the cattails are <1m tall. Overall 5-10% of the wetland is green. The staff gauge read 79cm at 10:50 PST.

I downloaded met, cam, and USB GHG data. I checked LoggerNet File Control to make sure the new cam card had mounted. I cleaned flux and rad sensors; NDVI incoming was dirty with bird poop and I swept a bunch of cattail fluff off the sonic transducers. I topped off the wash reservoir.

I swapped the LI-7500A for calibration: sn 75H-2667 came off and sn 0065 went on. I uploaded the new config file, updated the pressure coefficients, changed the eddy clock +1:30min from 10:43 to 10:44:30 and reset the 7550. All looked ok.

2667 dirty read: 430ppm CO2, 586mmol/m3 H2O, 18.7C, 101.8kPa, 103SS
2667 clean read: 427ppm CO2, 587mmol/m3 H2O, 19.1C, 101.7kPa, 104SS
0065 fresh read: 422ppm CO2, 632mmol/m3 H2O, 19.1C, 101.8kPa, 101SS
The 7700 read: 1.98ppm CH4, 48RSSI – 83 after cleaning

I got to the channel to download Flo’s data around 12:10 PDT. The water level was too high and turbid to see how much submerged aquatic vegetation was in the channel. I reset Flo’s clock to match the laptop time and downloaded data. I didn’t see many drops in the last week. We’re still recording at 1min interval. I’ll send the recent 1min data to Marc and see if that’s sufficient for them. If they have the data they need, then I can change the sampling duration and sampling interval back to 5min. I got back to the car and then realized I forgot to restart data logging. I walked back to Flo and restarted logging before I left around 12:30 PDT.

0 photos found

8 sets found

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