Field Notes

Bouldin Corn: 2023-02-14 11:20:00 (DOY 45)
Author: Daphne Szutu
Others: Carlos

Summary: Regular data collection/cleaning, cold and windy, water still draining from field, re-leveled sonic

2023-02-14
Bouldin Corn

Carlos and I arrived at 11:20 PST. It was mostly overcast, cold and windy. The water on the field is slowly draining and is barely ankle-deep at the tower. The surrounding fields are damp but there's not much standing water remaining. We noticed the ditch east of our field has been dredged, or at least the banks have been cleared of vegetation recently. A guy in a white truck passed us at our parking spot and asked what we were up to. He drove away once we said we were the tower team.

I downloaded met, cam, USB GHG, PA, and IRT data. There is no FD chamber deployed here yet; still waiting for the field to drain more. Carlos cleaned flux and rad sensor.

I changed the eddy clock +25sec from 11:38 to 11:38:25 and restarted logging. I checked the phenocam clock and changed it +1:30min from ~11:38 to 11:39:30.

Carlos noticed the sonic was tilted 2deg to the south and the 7700 was tilted 3deg to the south. I lowered the NW corner of the scaffolding by turning (banging with a hammer) the foot jack a few revolutions. I tightened both turnbuckles on the north side. This changed the sonic tilt from 2deg to 1deg. We added a washer as a shim between the sonic base and the sonic mount. The sonic mount also only had 2 bolts so we added a 3rd bolt. The sonic now level. The heading is the same as the most recent equipment entry, 353 deg true north. The 7700 is not quite level but that shouldn't affect the 7700 data. We should check the level of the whole tower next time.

The 7500 read: 420ppm CO2, 187mmol/m3 H2O, 11.4C, 101.6kPa, 101SS--103 after cleaning
The 7700 read: 1.94ppm CH4, 51RSSI--81 after cleaning

We left at 12:15 PST.

1 photos found

20230214BC_SonicShim.jpg ( 2023-02-14 12:09:21 ) Full size: 1440x1920
Shim under sonic mount to re-level sonic