Field Notes

<--2012-12-14 13:00:00 | 2013-01-17 13:15:00-->
Other sites visited today: Sherman Island | Mayberry | West Pond | DWR Corn
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Twitchell Rice: 2013-01-03 10:00:00 (DOY 3)
Author: Cove Sturtevant
Others: Joe

Summary: Downloaded data. Swapped out 7550 and 7500. Top of rain gauge blew off. Installed DO sensor. Some ice in 7700 reservoir.

Twitchell
2013-01-03

We arrived at approximately 10:00 PST. It was clear and cold (~6 °C). The field remains flooded and there was a thin sheet of ice in the shallow parts. We downloaded the data and autocam, and cleaned the flux instruments. Joe installed the DO sensor from West Pond (s/n DO4). We swapped out the 7550 for one recently returned from LI-COR with new firmware (removed s/n 674, installed s/n 650). We also swapped out the 7500 head for a newly calibrated one (removed s/n 2176, installed s/n 2180).

7500 before swap (s/n 2176):
CO2 = 460 ppm
H2O = 325 mmol m-3
agc = 37.5
sos = 335

7500 after swap (s/n 2180):
CO2 = 452 ppm
H2O = 354 mmol m-3
agc = 15.2 (new format)
sos = 335 m s-1

7700 readings:
CH4 = 2.7 ppm
RSSI =14 (bumped to 60 after cleaning)
Topped off reservoir (was 1/2 full, some ice). Need to mix with low temp washer fluid next time.

MET looked good. We noted that the top to the rain gauge had blown off but forgot to put it back on before we left.

3 photos found

20130103TW_MorningFog1.jpg ( 2013-01-03 09:17:55 ) Full size: 1920x1440
Tule fog in the Delta