Field Notes

East End: 2025-01-02 14:07:00 (DOY 2)
Author: Daphne Szutu
Others: Joe

Summary: End-of-year data collection, leak in wash reservoir--fixed, a few days of data missing from dark/rainy days, improved met box, dropped HMP solar shield bolts/nuts

2025-01-02
East End

Joe and I arrived at 14:07 PST. Happy new year! It was a mild winter day, calm, cool, and sunny with high thin clouds. The staff gauge read 56cm.

The wash reservoir was empty. Joe refilled it, then we tested the spray. There was a leak in the tubing at the reservoir. There was enough slack in the tubing so Joe pulled out the reservoir and fixed the leak. We have plenty of tubing in the lab so maybe we should put some extra in the blue bag for the field.

I downloaded met, cam, and USB GHG data. We are missing about 2 days of data from low power with the recent dark and dreary weather. I changed the eddy clock -5min from 14:30 to 14:25 PST to match the laptop time and restarted logging. LWin and PARin have both been spiky. I re-wired the LWin wires in the mux, although they looked fine. PARin has been spiky for a while so I moved it from mux 15 to 19 and sent a new datalogger program. The met numbers looked reasonable with the new program.

Joe cleaned flux and rad sensors. He confirmed the rain bucket funnel was clean. The HMP fan was dead so he swapped it out and in the process dropped 2 of the bolts and 3 of the nuts holding the solar shield together. It’s held together for now with the remaining bolt, some cross-threaded nuts, and zipties. We’ll bring all-thread and more nuts for next time.

I secured everything in the met box to the wooden backing board and brought the extra screws back to the lab. Much easier to do with the proper screwdriver! I also exported another handful of wasps out the box, but there are plenty more behind the wooden backing board.

We downloaded the miniDOT and swapped the desiccant for the miniDOT and the water level sensor. Joe measured the surface water conductivity.

Surface, 713uS, 7.3C

The 7500 read: 428ppm CO2, 530mmol/m3 H2O, 17.8C, 101.9kPa, 94SS—95 after cleaning
The 7700 read: 2.19ppm CH4, 24RSSI—79 after cleaning

Maintenance to-do:
- Extra half-layer of scaffolding on the boardwalk that could go back to the lab
- Two full sets of scaffolding from Home Depot (one on the boardwalk, one still in the wetland) that are rotted and could be cut up recycled. Maybe we should buy our own skillsaw with a metal-cutting blade.
- Replace water level sensor with one that has a better-sealed outer cable.
- Stomp down litter where water level sensor and conductivity sensor are
- Remove well pipe
- Add some jumpers to empty mux ports
- The 7700 power cable is short and has an awkward run to to the met box. Not sure if this grey cable was previously trimmed, but maybe try a new power cable?

We left at 15:00 PST.

0 photos found

11 sets found

14 EE_met graphs found