Field Notes

Twitchell Alfalfa: 2014-02-25 14:45:00 (DOY 56)
Author: Cove Sturtevant
Others: Dennis, Patty

Summary: Field extensively grazed by sheep. Moved 7700 over to East End. Regular field work. Data download. Reset radiation 10x.

Twitchell Alfalfa
2014-02-25

We arrived about 14:45 PST, having first dropped off Joe and the new scaffold at East End. It was partly cloudy, warm, and breezy. About 2/3 of the field has been grazed to dirt by sheep which are presently confined to the middle third of the field. Should make for interesting fluxes.

I downloaded data and cleaned the flux instruments while Dennis removed the 7700 (sn 0155) for install at East End. Patty took spectral measurements and cleaned the radiation sensors and solar panels.

7500 readings:
CO2 = 394 ppm (410 after cleaning)
H2O = 599 mmol m-3 (535 after cleaning)
SS = 75.5% (77.87% after cleaning)
T = 20.3 C
p = 101.1 kPa
sos = 346.5 m s-1

7700 readings:
CH4: 2.3 ppm
RSSI: 5%
Reservoir was empty.

MET looked good.

The radiation 10x wasnâ€™t working and the solar panel was flat. Tilted solar panel to the south and recycled connection from battery to solar controller. 10x restarted.

3 photos found

20140225TA_SheepOnField.jpg ( 2014-02-25 15:21:20 ) Full size: 1920x1440
Sheep on the alfalfa field