Field Notes

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Bouldin Corn: 2020-08-21 12:30:00 (DOY 234)
Author: Daphne Szutu
Others:

Summary: Regular data collection and cleaning, terrible air quality because of wildfire smoke, installed PurpleAir sensor, swapped 7500 for calibration

2020-08-21
Bouldin Corn

I arrived at 12:30 PDT. The day was warm with some breeze and occasional gusts. The sky was a murky brown soup and there was weak, reddish sunshine. The air quality was terrible because of wildfires that started earlier this week. Weâ€™re now into month 6 of coronavirus shelter-in-place.

Someone (Tyler?) has started pulling weeds east of the tower. The corn plants are mostly yellow now. Ben is expecting to harvest at the end of September, and Tyler plans to move his chambers back the first week of September. Do we want to take one more biomass sample before they harvest?

I installed PurpleAir sn 84f3ebd5ffb1 at its usual location on the SW corner of the tower. The PM2.5 reading was 240-260.

I downloaded met, cam, and USB GHG data. I swapped the LI-7500A for calibration: sn 75H-2176 came off and sn 0073 went on. I updated the configuration file, changed the pressure coefficient, and reset the box. I cleaned flux and rad sensors, topped off the wash reservoir, and swapped the water level desiccant.

LI-7500 readings (sn 75H-2176 --> sn 75H-2176 after cleaning --> sn 0073):
CO2 413ppm --> 425 --> 421
H2O 813ppm --> 473(seems low) --> 702
T 30.9C --> 31.4 --> 31.3
P 100.4kPa --> 100.4 --> 100.3
SS 100--> 103 --> 103
LI7700 readings:
CH4 2.0ppm
RSSI 30-->90 after cleaning

I left at 13:15.

0 photos found

6 sets found

17 BC_met graphs found