Field Notes

Bouldin Corn: 2021-03-04 14:55:00 (DOY 63)
Author: Daphne Szutu
Others:

Summary: Regular data collection/cleaning, swapped 7500 for calibration, changed eddy clocks +1min, new electronic gate by overpass, field is no longer flooded

2021-03-04
Bouldin Corn

I arrived at 14:55 PST. It was a mild and slightly breezy day with blue skies and hazy horizons. The main red gate by the overpass has been converted into an electronic gate, so I parked outside the gate and walked in. Thereâ€™s no standing water on our field now.

I downloaded met, camera, and USB GHG data. I downloaded FD data and cleared its memory. I downloaded PA data and power-cycled the sensor. The wash reservoir was mostly full; I topped it off. I also cleaned the flux and rad sensors and swapped the desiccant for the water level sensor.

The met enclosure still needs to be ground: I think the grounding anchor on the outside of the box is missing a bolt or screw to attach it to the enclosure.

I swapped LI-7500s for calibration: sn 1594 came down and sn 75H-2514 went up. After the swap, I uploaded a new config file and updated the pressure coefficient. I also changed the eddy clocks from 15:12 to 15:13 to match the laptop time. I reset the 7550 box and checked that the USB was logging, the 7700 was connected, and the times still looked good.

LI-7500 readings (sn 1594 --> sn 1594 after cleaning --> sn 75H-2514):
CO2 415ppm --> 427 --> 424
H2O 452ppm --> 356 --> 368
T 19.2C --> 19.3 --> 20.7
P 102.2kPa --> 102.2 --> 102.2
SS 98--> 102 --> 101
LI7700 readings:
CH4 2.1ppm
RSSI 44-->73 after cleaning

I left at 15:25 PST.

1 photos found

bouldincorn_2021_03_03_121505.jpg ( 2021-03-03 12:16:50 ) Full size: 1296x960
Smoke plume on the horizon