Field Notes

Bouldin Corn: 2021-11-18 10:00:00 (DOY 322)
Author: Daphne Szutu
Others: Dennis, Robert

Summary: Regular data collection/cleaning, gaps on mux data -- fixed for now, PA card slot working but corroded -- brought back to lab, calibrated tipping bucket and adjusted -- now good until next year, changed HMP fan

2021-11-18
Bouldin Corn

Dennis, Robert, and I arrived at 10:00 PST. It was foggy and chilly and we could hear a lot of ducks in the air. There was a truck parked at the duck club and there were about 5 freshly killed ducks hanging up on a rack. Green weeds and what looks like volunteer corn are beginning to grow on the field. Tylerâ€™s 18 chambers are still clustered by the blue boxes.

I downloaded met, camera, and USB GHG data. I downloaded FD data and cleared its memory. I downloaded the IRT data by ejecting the card and using CardConvert to convert the fast data to TOB1 and the slow data to TOA5. I put the blank microSD card back in. Robert and Dennis cleaned flux and rad sensors. All the sensors were wet with dew. The wash reservoir was Â½ full; we refilled it.

There were issues with gaps again on the mux sensors. From the mux, I unplugged the 4-block connecting CLK, RES, PWR, G to the CR1000 and tightened all those screws down. The CLK and RES screws were maybe Â¼-1/2 turn loose. We tightened this about a month ago, so Iâ€™m surprised it came loose again.

I downloaded the PA data and noticed there was corrosion on the card slot, so I brought the Purple Air sn 68c63acc07a9 back to the lab to repair. We have a spare PA in the lab that we can install next time.

I changed the eddy clock +45sec and the phenocam clock +15sec. I re-started logging in the 7550 after changing the clock.

Last time we calibrated the tipping bucket sn 65548-615, but I forgot to adjust it before we left. This time I turned it 1 turn CCW and then we calibrated it again. We dripped 240ml of water through the bucket using a peristaltic pump powered with a lithium battery. This should result in 50 tips in about 20 minutes. We got 49 tips; I think thatâ€™s close enough so I did not adjust it. The bucket should be ok until next fall.

Dennis used the spray bottle to clean off the FD membranes which had some wet soil on them, probably splashed up by the rain. He checked the well with a measuring tape and noticed the well was dry on the bottom.

Right before we left, I noticed one of the HMP fan wires was broken at the screw terminal, which was pretty corroded. I replaced the fan with a new 24V fan and a new screw terminal and squeezed silicone gel into the screw terminal to try to protect it from moisture. Of course, after I gooped it all up, I noticed the new fan was not actually spinning even though it was receiving 22.3V of power. Maybe this fan was DOA. I put in a new 12V fan and switched the fan power wire in the datalogger box from the 24V screw terminal to the 12V pluggable power strip. The fan was running at a reasonable speed before we left.

LI-7500 readings:
CO2 486ppm
H2O 520ppm
T 11.8C
P 101.9kPa
SS 103 after cleaning
LI7700 readings:
CH4 2.7
RSSI 80 after cleaning

We left at 11:20 PST.

0 photos found

6 sets found

17 BC_met graphs found