Field Notes

<--2015-05-07 10:50:00 | 2015-06-09 15:30:00-->
Other sites visited today: Twitchell Alfalfa | West Pond | East End | Twitchell Rice

Mayberry: 2015-05-21 09:00:00 (DOY 141)
Author: Joe Verfaillie
Others: Sara

Summary: Cleaned water sensors, moved water level and conductivity, copper screens from water CO2, set clock on 23x and AIU, installed barometer, RH/AirT fan needs replacing

Mayberry
2015-05-21

I arrived about 9am with Sara. It was cool, breezy and overcast. The water was a little higher than usual. The wetland is getting green, but a lot of thatch is still visible. The weeds on the levees are tall and thick.

Sara went into the water to clean the DO and CO2 sensors and check on the water level and conductivity probes. The DO and CO2 sensors were all cleaned. The CO2 sensors got new copper meshes held on with stainless steel hose clamps. The connector on the top CO2 sensors is beginning to corrode. We might try wrapping these with silicone tape.

Both the water level and conductivity sensors might have been laying in the mud at the bottom. The water depth at the scaffolding was 70cm. The water pressure and conductivity probe were remounted at 25cm below the water surface.

The 7700 read: 1.915ppm CH4, 36.3RSSI â€“ 69.6 after cleaning
The 7500 read: 359.7ppm CO2, 580.5mmol/m3 H2O, 73.5SS, 14.88C, 101.3kPa â€“ 95.5SS after cleaning

The CR23X clock has been about 10min behind for a long time. Today at 8:21PST the data logger read 8:09 and I reset the data logger clock. The Licor system clock was off by a couple minutes. I reset this as well.

I installed barometer sn E1330045. This barometer had a different range than the previous one so I updated the 23x program with the new range and changed the measurement from SE to Diff.

The HMP60 fan was not working, I forgot to replace it.

5 photos found

20150521MB_ViewNorth.jpg ( 2015-05-21 09:23:22 ) Full size: 2560x1440
View to the north of the Tower