Field Notes

East End: 2019-12-05 11:40:00 (DOY 339)
Author: Daphne Szutu
Others: Alex, DÃ©bora

Summary: Regular data collection/cleaning, lots of blowdown, power was off--fixed, missing half-day of data

2019-12-05
East End

Alex, DÃ©bora (our visitor from Brazil), and I arrived at 11:40 PST. It was an overcast, foggy, and cool day. Lots of rain in the past week and more to come this weekend.

There was a lot of blowdown, especially of the cattail. There were still some upright, green tule bunches, even though the wetland was mostly brown. The water level was 41 cm.

When we arrived, the logger box was open and the bottom surface of the box was wet, and there was no power at the datalogger box or to the 7550. The conductivity interface was wet. I put on waders and checked the solar panels and batteries, pushing my way through the vegetation. The solar amps and battery voltages seemed fine, so there was probably a short at the tower when something inside the datalogger box got wet. I reset the solar charge controller, and all the sensors came back online. The met and flux numbers all seemed reasonable.

I wiped the bottom of the datalogger box, removed the conductivity sensor sn 6494 and its interface to fully dry and test back in the lab, and moved a desiccant pack from the 7550 box to the datalogger box. I downloaded met, camera, and USB GHG data--there was met data until midnight. The wash reservoir was empty; Alex refilled it and cleaned flux and rad sensors.

LI-7500 readings:
CO2 490ppm
H2O 299ppm
T 13.5C
P 101.8kPa
SS 78--> 100 after cleaning
LI7700 readings:
CH4 2.5ppm
RSSI 24--> 80 after cleaning

We left around 12:35.

Looking at the data back in the lab, the barometer's air pressure dropped suddenly in the past few days, whereas the 7500/7700 air pressure did not. Should check the sensor next time.

0 photos found

11 sets found

14 EE_met graphs found