Field Notes

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Other sites visited today: Gilbert Tract | Mayberry | Bouldin Corn | Bouldin Alfalfa
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East End: 2024-06-18 14:35:00 (DOY 170)
Author: Daphne Szutu
Others: Charlie

Summary: 7700 clock sync error--reset, RH/AirT data bad--fixed maybe

2024-06-18
East End

Charlie and I arrived at 14:35 PST (15:35 PDT). It was warm, hazy, and breezy outside of the canopy. We stopped first on top of the levee next to the pumphouse to show Charlie the view. 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.

The staff gauge read 79cm.

I downloaded met, cam, USB GHG, and miniDOT data. I swapped desiccant for the miniDOT and water level sensor. There was a 7700 clock sync error when we arrived, which went away after I changed the eddy clock +1min to match the laptop time. I restarted logging and confirmed that the 7700 clock sync error did not show up. Charlie cleaned flux and rad sensors and refilled the wash reservoir. He noticed a small, white spot on the SWin sensor.

The HMP60 data was obviously bad when I arrived, and looking at the data back in the lab, the air temperature was has been funky since early June, and maybe the nighttime temperatures have been drifting since the beginning of 2024. The RH seems overall reasonable. The minimum RH has been super low (<10) in the past week, although we have had a Red Flag warning in the past week. We’ll have to compare with nearby sites.

I thought the HMP 60 finally died, but after I messed with the mux wiring, I think it was just a loose wire. I moved it to another mux port, and updated the program—the numbers looked fine. I moved it back to the original mux port and reloaded the original program—the numbers still looked fine. I deleted the updated program from the CR1000 memory and made sure the original program was running and set to run on datalogger power up. There were some spiderwebs on the original mux port that I cleaned off. Maybe I should install our new HygroVUE here anyways, and save the HMP60 as back-up.

The 7500 read: 414ppm CO2, 394mol/m3 H2O, 31.9C, 100.7kPa, 95SS – 96 after cleaning
The 7700 read: 2.05 ppmCH4, 60RSSI – 78 after cleaning

We forgot to measure the surface water conductivity.

We left at 15:10 PST (16:10 PDT).

0 photos found

11 sets found

14 EE_met graphs found