Field Notes

Twitchell Rice: 2013-06-27 10:15:00 (DOY 178)
Author: Cove Sturtevant
Others: Laurie, Yanel

Summary: Cut down swath of cattails near tower. Standard fieldwork. All good.

Twitchell Rice
2013-06-27

We arrived about 10:15 PDT. It was warm/hot (25.5 C), sunny, and humid with a nice breeze. The rice continues to grow steadily, currently about knee high if standing in the water. There is a swath of ~chest high cattails growing along the margins where the field was not plowed. I cut down this swath in the direct vicinity of the tower (see photo) to avoid upward flow and unrepresentative radiation/ground sensor readings. Laurie and Yanel did spectra measurements and clip plots. I downloaded data and attended to the tower.

7500 readings:
CO2 = 387 ppm (400 after cleaning)
H2O = 920 mmol m-3 (820 after cleaning)
signal strength = 75.6% (78.5% after cleaning)
t = 25.2 C
p = 102.2 kPa
sos = 349.7 m s-1

7700 readings:
CH4 = 1.8 ppm (same after cleaning)
RSSI = 41.5 (bumped to 72 after cleaning)
Topped off the reservoir (was about full).

MET looked good, including the DO probe (reading about 4 mV). I cleaned some spider webs from the sonic and 7700. I also cleaned the radiation instruments. The net radiometer had some bird poop on it. Checked clock settings on the 7550: A-OK.

2 photos found

20130627TW_cutdowncattails.jpg ( 2013-06-27 10:30:00 ) Full size: 1296x968
Cattails cut down