Field Notes

Mayberry: 2013-08-21 14:20:00 (DOY 233)
Author: Cove Sturtevant
Others: Joe, Laurie

Summary: Calibrated 7700. 7700 washer line needs replacing.

Mayberry
2013-08-21

We arrived about 14:20 PDT. It was breezy, sunny, and warm. Laurie went out and cleaned the instruments and took water samples while Joe and I attended to the tower and calibrated the 7700.

7500 readings:
CO2: 392 ppm (395 after cleaning)
H2O: 740 mmol m-3 (700 after cleaning)
signal strength = 96.1% (96.4% after cleaning)
t: 25.4 C
p = 101.1 kPa
sos = 347.5 m s-1

Current 7700 readings:
CH4 = 1.80 ppm (1.88 after cleaning)
RSSI = 21 (88 after cleaning)
The reservoir was full.
We noticed that there was a break in the washer fluid tubing where it exited the reservoir. In fact, the whole tube is rather deteriorated. Joe spliced the break in the tube and well bring an entire replacement tube next week. Next week we will also swap out the 7700 radiation hat with one that has better bird spike placement. The current one doesnt seem to keep all bird activity off of it.

We calibrated the 7700 with zero gas and 4.995 ppm span tanks we brought with us. The zero offset was 0.00 ppm and the span offset was -0.029 ppm. CH4 read 1.9 ppm after calibration. We downloaded the GHG data because we noticed the 7700 time was not updated to GMT+8 (was still in GMT-8, causing the heaters to come on at the wrong times). I dont think this had any effect on the data sync to the 7550, but we downloaded the data anyway and changed to the correct GMT+8 time zone (at 13:40 GMT+8).

MET looked good.

Joe added a bolt to the post for the camera boom so that the boom rotated to about level and stopped.

0 photos found

11 sets found

7 MB_flux graphs found