Field Notes

Bouldin Alfalfa: 2019-01-31 15:50:00 (DOY 31)
Author: Daphne Szutu
Others: Kuno, Jiangong

Summary: Regular data collection/cleaning, swapped 7500 for calibration, 7700 clock sync error, sheep grazing our field

2019-01-31
Bouldin Alfalfa

Kuno, Jiangong, and I arrived at 15:50. It was sunny with fog/clouds at the horizon. Our field was getting grazed right around the tower and the sheep were guarded by 3 sheep dogs, so we drove on the neighboring field and parked across the ditch from our tower. The sheep herder came on his ATV, stepped down on the electrical fence, and motioned for us to cross.

Kuno and Jiangong cleaned the flux and rad sensors and swapped the 7500 for calibration: sn 75H-2667 came down and sn 0035 went up. I uploaded a new configuration file, updated the pressure coefficients, and reset the box. There was a 7700 clock sync error; I changed the 7700 clock settings from slave to auto and reset the box, which solved the problem. This seems to be happening across all the 7700s more frequently. Looking at the data in the lab, the GHG columns were funky--7700 data was stored, but only 7500 data columns were stored. Hopefully the new firmware from Licor (v.1.0.27) will fix both the GHG column and clock sync errors.

I collected met, camera, and USB GHG data. I skipped the FD since the sheep herder was patiently waiting for us.

LI-7500 readings (sn 75H-2667--> sn 75H-2667 clean --> sn 0035):
CO2 448ppm --> 452 --> 448
H2O 595ppm --> 608 --> 575
T 18.6C --> 18.6 --> 19.8
P 101.2kPa --> 101.2 --> 101.6
SS 106--> 108 after cleaning --> 99

LI7700 readings:
CH4 2.4ppm
RSSI 65 --> 75 after cleaning

We left at 16:05.

Next Mowing: 2019-04-29

1 photos found

20190131BA_sheepgrazing.jpg ( 2019-01-31 16:01:12 ) Full size: 1920x1440
Sheep grazing at Bouldin Alfalfa.