Field Notes

Sherman Island: 2013-08-21 13:15:00 (DOY 233)
Author: Cove Sturtevant
Others: Joe, Laurie

Summary: Swapped 7500 for calibrated one. Regular field work. Tightened soil CO2 probe connections - fixed dropout from deep probe in 1st profile. Removed unused 10x from site.

Sherman
2013-08-21

We arrived about 13:15 PDT. It was sunny, windy, and warm (23 C). The water under the bridge on the way in was gone but the soil still muddy.

Joe and I checked the tower and swapped the 7500 for a calibrated one (removed box and head sn 0035, installed box and head sn 1594). Laurie did moisture point, soil CO2 flux, and spectral. I took well depth.

LGR readings: 1.84 ppm, 13:33, 27.8 C, 130.1 Torr (adjusted to 143.7 Torr), 12.58 us, 10 Hz

7500 readings (before swap):
CO2: 15.8 mmol m-3 (16.0 after cleaning)
H2O: 720 mmol m-3 (700 after cleaning)
diag: 248
p: 101.1 kPa
t: 26.4 C

7500 readings (after swap):
CO2: 16.1 mmol m-3
H2O: 680 mmol m-3
diag: 248
p: 101.2 kPa
t: 26.5 C

MET looked good.
Soil CO2 looked good. The deep CO2 probe in profile 1 was showing some dropouts in the data, and the reading was low when we arrived). Joe found a loose connection and tightened all the screws. The reading came back to normal afterward. This should fix the dropouts.

Cleaned radiation instruments.

Joe removed a 10x from the site that wasnt being used.

1 photos found

20130821SI_Thurderhead.jpg ( 2013-08-21 14:56:49 ) Full size: 1920x1440
Thunderheads over Delta fields