Field Notes

Bouldin Alfalfa: 2020-12-03 10:15:00 (DOY 338)
Author: Daphne Szutu
Others: Camilo

Summary: Regular data collection/cleaning, sheep on corner of the field, swapped 7500 for calibration

2020-12-03
Bouldin Alfalfa

Camilo and I arrived at 10:15 PST. It was a calm and hazy day with many snow geese flying overhead. Weâ€™re now into month 9 of coronavirus shelter-in-place.

There was a flock of sheep grazing 2 fields to our east, and a few enclosures with lambs and ewes were set up in the NE corner of our field. There was some non-electrified fencing going down the length of our field, so we parked as close as we could and walked to the tower. There is a wire fence set up around our tower that we were able to hop over.

I downloaded met, cam, USB, and FD data. I cleared the FD chamber after download. Camilo cleaned flux and rad sensors and topped off the reservoir.

We swapped the LI-7500 for calibration: sn 0065 came down and sn 75H-2182 went up. I uploaded a new config file, updated the pressure coefficients, and reset the box.
I added a quick disconnect for the precip bucket, but we didnâ€™t test the bucket here. I tested the 7700 wash, which seemed fine.

LI-7500 readings (sn 0065 --> sn 0065 after cleaning --> sn 75H-2182):
CO2 461ppm --> 463 --> 455
H2O 374ppm --> 360 --> 390
T 11.9C --> 13.6 --> 13.8
P 102.6kPa --> 102.6 --> 102.6
SS 98--> 100 --> 99
LI7700 readings:
CH4 2.3ppm
RSSI 39-->73 after cleaning

We left at 10:45 PST.

Next Mowing: 2020-12-11

6 photos found

20201203BA_Fence.jpg ( 2020-12-03 10:32:19 ) Full size: 1920x1440
Farmers have set up a wire fence around our tower to protect it from imminent sheep.

bouldinalfalfa_2020_12_02_074506.jpg ( 2020-12-02 07:48:34 ) Full size: 1296x960
Fog and moonrise

20201203BA_Radiometers.jpg ( 2020-12-03 10:19:34 ) Full size: 1920x1440
4-way radiometer and Apogee NDVI sensors

bouldinalfalfa_IR_2020_12_04_104506.jpg ( 2020-12-04 10:48:58 ) Full size: 1296x960
Bird tail

bouldinalfalfa_IR_2020_12_03_104506.jpg ( 2020-12-03 10:48:50 ) Full size: 1296x960
Daphne and Camilo stepping over the sheep fence to return to their cars

bouldinalfalfa_2020_12_03_101505.jpg ( 2020-12-03 10:18:22 ) Full size: 1296x960
Camilo's and Daphne's cars parked in the field on the other side of the electric fence