Field Notes

Bouldin Corn: 2020-02-20 09:30:00 (DOY 51)
Author: Joe Verfaillie
Others: Daphne, Robert, Sebastien, Stephen, Tyler

Summary: Inspecting the site for N2O system, power off momentarily for current sensor install, 7500 swap, reinstalled purple air, box doors found open

Bouldin Corn
2020-02-20

Daphne, Robert and I arrived at 9:30. Stephen and Sebastien came with us to check out the site and plan for installing an N2O eddy flux system. Tyler also arrived while we were there to check on the auto chambers. It was sunny and cool with high thin clouds and a breeze from the north. The fields are mostly free of standing water but the water table is just below the surface. The well level was 1.75ft. Weeds along the edges of the field are yellow where they were spraying last week.

The doors on the power box and Tylerâ€™s multiplexor box were both open when we arrived.

Stephen and Sebastien seemed satisfied with the site. They plan to mount another post on the long side of the scaffolding facing the field. They will add a C-SAT sonic and inlet for the Campbell N2O Laser. The laser and pump will go on blocks under the tower. They also plan to add a cell modem so full data can be retrieved from the site on a daily basis. They might also test a prototype open-path N2O analyzer from ? Southwest Science http://www.swsciences.com ?

I added a toroid AC current sensor on the power line to the tower. I had to shut of the power to slip the toroid on the line. The 20A breaker that says â€œPlease donâ€™t turn off, Thank youâ€ is our breaker. However when I first turned it off Tylerâ€™s system was still running on a UPS and I thought I got the wrong breaker. I figured this out after turning the breaking back on, taking the panel apart to trace the wires and turning the breaker off again. Someone jammed another wire into our breaker that powers a security light on the wall above the panel. Once I got the toroid current sensor in place I restored power and regular field work commenced. After we got the senor wired and the data logger program updated it was reading 2.7A (about 270W) which seemed to match what Tyler thought his equipment was pulling.

Daphne collected data and Robert cleaned sensors and swapped the 7500: sn 0042 came off and sn 75H-2668 went on. After the swap, the new config was uploaded, pressure coefficients updated and the box was restarted.
0042 off: 453ppm CO2, 381mmol/m3 H2O, 13.0C, 101.6kPa, 102SS
2668 on: 457ppm CO2, 409mmol/m3 H2O, 13.3C, 101.8kPa, 101SS

The 7700 read: 3.08ppm CH4, 3.0RSSI - 84 after cleaning
The wash reservoir was 1/4 empty â€“ refilled

I reinstalled the original PurpleAir sensor sn 68c63acc07a9 which I repaired in the lab after getting wet when the tower fell down. It is now in an outer PVC solar/weather shield and mounted on the southwest corner post of the scaffolding. The power cable was also replaced as the original seemed to have a bad micro USB connector. It was reporting numbers via wifi before we left.

Data from the FD Chambers was downloaded but not cleared.

We left at 10:45.

After we got back to the lab, there were only 2 random days of camera photos. This was a brand new card, so we need to check the phenocam next time.

0 photos found

6 sets found

17 BC_met graphs found