Field Notes

West Pond: 2021-10-07 11:10:00 (DOY 280)
Author: Daphne Szutu
Others: Dennis, Ari

Summary: Regular data collection/cleaning, wetland still dry, swapped 7500 for calibration, lots of spiderwebs over the sensors

2021-10-07
West Pond

Dennis, Ari, and I arrived at 11:10 PDT. It was a pleasant day, mild and partly cloudy with a slight breeze. We could smell some occasional smoke, but we didnâ€™t see any obvious fires nearby. There werenâ€™t as many tule flowers here compared to Mayberry. The water level is still going down; no water at the soil surface.

The reservoir was 1/3 empty; we refilled it. Ari and Dennis cleaned flux and rad sensors. There were many spiderwebs on the upper 7700 mirror and lots of spiderwebs and bird feathers around the radiometers. The RSSI was 0, but I forgot to check the wash spin/spray. I think the spray/spin are probably ok, it was just cleaning the lower mirror repeatedly (and using 1/3 of the reservoir) and not getting the spiderwebs on the upper mirror.

I downloaded met, cam, and USB GHG data. Ari straightened the view of the Canon camera. We swapped LI-7500s for calibration: sn 75H-2182 came off and sn 75H-2150 went on. I uploaded a new config file, updated the pressure coefficients, changed the eddy clock ~+30sec to match the laptop time, and rest the box. I checked that the USB was logging and the 7700 was connected.

LI-7500 readings (sn 75H-2182 --> sn 75H-2150):
CO2 400ppm --> 408
H2O 430ppm --> 383
T 20.3C --> 20.5
P 101.5kPa --> 101.4
SS 94--> 100 after cleaning
LI7700 readings:
CH4 2.5ppm
RSSI 0--> 83 after cleaning

We left at 11:30 PDT.

1 photos found

WP_autocam_20211007_1745.jpg ( 2021-10-07 17:45:01 ) Full size: 1920x1440
Pretty colors at sunset