Field Notes

<--2012-08-16 12:30:00 | 2012-08-30 11:45:00-->
Other sites visited today: Sherman Island | Mayberry | Twitchell Rice | DWR Corn

West Pond: 2012-08-23 14:30:00 (DOY 236)
Author: Cove Sturtevant
Others: Sara, Laurie

Summary: Swapped 7500A heads, DO sensor may be bad, vegetation tall and green with lots of algae in water.

West Pond
2012-08-23

We arrived at about 14:30 PDT with an intermittent breeze and sunny skies. The vegetation was still very green and tall, lots of algae in the water. Sara checked the tower readings while I swapped out the 7500A heads.

Readings prior to swap:
CH4: 1.94 ppm
RSSI: 70
CO2: 340 ppm
H2O: > 1000 ppm
agc: 50

The 7500A readings seemed off, similar to last week. We put in sn 75H-2182, following the procedure that Joe found to work, which was to 1) connect to the instrument, 2) save the current configs, 3) load the new configs, and 4) without disconnecting, swap the heads. This worked splendidly, although Sara was having some issues with the program disconnecting unexpectedly. This happened during the swap without any problems, however.

After the swap, the 7500A read:
CO2: 380 ppm
H2O: 700 mmol m-3
agc: 43.8
temp: 28.9 ï¿½C

The DO sensor was reading ~1, but Sara wanted to talk to Joe before pulling it. Laurie put up tower guidelines sheet.

1 photos found

WP_autocam_20120823_1345.jpg ( 2012-08-23 13:45:02 ) Full size: 1920x1440
Boom folded for field visit