Field Notes

Bouldin Corn: 2018-01-16 12:35:00 (DOY 16)
Author: Daphne Szutu
Others: Dennis, Kyle, Sam

Summary: Regular data collection/cleaning, re-installed 7500 on temporary mount

2018-01-16
Bouldin Corn

We arrived at 12:35. It was cool and overcast with a light breeze. The field is flooded and the ground by the tower is squishy. All of Tyler and Heather's chambers are off the field and on top of the blue box.

Kyle refilled the wash reservoir; it was 1/2 empty. Dennis cleaned the rad and flux sensors. There has been no 7500 here because the previous one had a PLL chopper error. We forgot to bring the 7500 Licor mount and did not initially install the replacement 7500.

I collected met, camera, and USB GHG data. AirT was too high, ~37 deg C. SHF plates were all NAN. Kyle checked the connection between the HMP sensor and the cable; it looked fine. After he reconnected the cable, AirT seemed reasonable, ~10 deg C, and SHF plates were non NAN. VWC3 has been reading 7999 in and out, but seems ok now. We should keep an eye on these measurements.

LI-7500 readings:
CO2 (no sensor)
H2O (no sensor)
T 12.3 C
P 102.2 kPa
SS (no sensor)

LI7700 readings:
CH4 2.2 ppm
RSSI 60 --> 70 after cleaning

We left at 13:05.

We came back at 13:50. Kyle and Sam attached LI-7500 sn 0035 with electrical tape and zip ties to the 7500 post; the top of the post is next to the open path, so the air flow through the sensor is slightly blocked. Next time we will bring the 7500 Licor mount and bird spikes to install the sensor properly. I uploaded the configuration file, updated the pressure coeff, and reset the 7550 interface box.

LI-7500 readings:
CO2 435 ppm
H2O 555 ppm
T 13.12 C
P 101.8 kPa
SS 100

We left again at 14:10.

Note: compare diffuse to Rgin.

1 photos found

20180116BC_7550TempMount.jpg ( 2018-01-16 14:03:25 ) Full size: 480x640
Temporary mount for 7550 because we forgot the Licor mount.