Field Notes

East End: 2021-03-16 14:50:00 (DOY 75)
Author: Daphne Szutu
Others:

Summary: Regular data collection/cleaning, 7700 wash reservoir leaking--needs attention, changed eddy clocks +3min, swapped 7500 for calibration

2021-03-16
East End

I arrived at 14:50 PDT. It was a mild and breezy day with gauzy clouds. There are tules and cattails coming up by the tower. I should put in the undercanopy PAR sensor soon before things are growing too much. The staff gauge read 34 cm. (Note by Daphne 2021-03-19: I had originally written 43cm in the notes, but 34 cm makes much more sense with the water level sensor data, so I think I just made a mistake reading the staff gauge or writing the number down.)

The reservoir was empty again. After refilling it and watching it for a while while doing other tasks, I realized it was leaking. I pulled the reservoir out and it was leaking at the in-line filter, which had already been taped up with electrical tape. The jostling made the reservoir leak even more, so I re-taped the filter which helped. Iâ€™m not sure what a better fix would be without replacing the filter.

I downloaded met, camera, and USB GHG data. I cleaned flux and rad sensors. The conductivity sensor was clean.

I swapped LI-7500s for calibration: sn 0041 came off and sn 0065 went on. After the swap, I uploaded a new config file and updated the pressure coefficient. When the 7550 clock was 13:54, I set it to 13:57 to match the laptop time. I reset the 7550 box and checked that the USB was logging, the 7700 was connected, and the clocks still looked good.

LI-7500 readings (sn 0041 --> sn 0041 after cleaning --> sn 0065):
CO2 416ppm --> 418 --> 425
H2O 300ppm --> 288 --> 277
T 18.6C --> 18.5 --> 18.1
P 101.6kPa --> 101.6 --> 101.6
SS 100--> 101 --> 100
LI7700 readings:
CH4 2.09ppm
RSSI 62-->83 after cleaning

I left at 15:25 PDT.

0 photos found

11 sets found

14 EE_met graphs found