Field Notes

Bouldin Corn: 2020-01-07 09:30:00 (DOY 7)
Author: Daphne Szutu
Others: Joe, Camilo

Summary: Regular data download/collection, cold and foggy, updated 7700 wash/heat settings, installed 3 eosFD chambers, set phenocam clock forward 16 min, swap PRI sensor, new CR1000 program, missing camera data

2020-01-07
Bouldin Corn

Joe, Camilo, and I arrived at 9:30 PST. It was very cold, foggy, and a little breezy. There field was flooded in the past few weeks, and now there is only some water on the field in low spots. The water level was 1.14ft from the top of the pipe; I forgot to measure the pipe height from the ground.

Joe re-installed the 3 eosFD chambers on 12â€ black plastic collars. One chamber is in the blown-down corn patch sn FD20180047 and 2 chambers sn FD20180048 and sn FD20180067 are by Tylerâ€™s gas ports. The serial numbers should match the original locations. All location had standing water but just puddles. Bubbles were released by the sediments as the chambers were installed.

Camilo cleaned flux and rad sensors (lots of condensation on eddy mirrors). I changed the 7700 heater settings to match BA (changed power from 5 to 25, changed end time from 9:00 to 11:00), and I changed the 7700 wash spin from 10 sec to 30 sec to allow enough time to spin away the spray water (7700 wash spray remained at 10 sec). The 7500 and 7700 clocks looked ok. We put a new spiky hat on the 7700, but one spike broke off already.

I downloaded met, camera, USB GHG, and PA data. I set the phenocam clock from 10:29 to 10:45 to match the laptop time. We swapped desiccant for the water level sensor. The wash reservoir was empty; we refilled it.

Camilo swapped PRI_out sensor (field-stop sn 930103952 came down, hemispherical sn 897103002 went up). There were gaps in the water-level data. I changed the CR1000 program to update the PRI_out address and to ignore NANs in the water level averages.

LI-7500 readings:
CO2 450ppm
H2O 153ppm
T 4.0C
P 101.8kPa
SS 92--> 98 after cleaning
LI7700 readings:
CH4 4.1ppm-->2.7 after cleaning
RSSI 1.4-->40 after cleaning (a lot of condensation on mirrors)

We left at 11:00 PST.

Back in the lab, there were no camera photos after 2019-12-23. Maybe the current card is getting old.

0 photos found

6 sets found

17 BC_met graphs found