Field Notes

West Pond: 2020-12-03 11:30:00 (DOY 338)
Author: Daphne Szutu
Others: Camilo

Summary: Regular data collection/cleaning, swapped 7500 for calibration, added METER Atmos14 for AirT/RH intercomparison, water level low, 7700 wash not working consistently--need new power cable

2020-12-03
West Pond

Camilo and I arrived at 11:30 PST. It was a hazy, mild, and still day. Weâ€™re now into month 9 of coronavirus shelter-in-place. The water level is still low and the staff gauge read 8 cm. The water level will probably remain low for now as the river water is too saline. The eosGP and conductivity sensor were out of the water and the miniDOT was just barely in the water.

The reservoir was full. The 7700 wash was not working, but disconnecting the power cable at the box and reconnecting it seemed to fix the issue. We should replace the power cable because itâ€™s a little cracked at the head.

I downloaded met, cam, USB, and miniDOT data. I swapped the miniDOT and water level sensor desiccant. The NDVI_in sensor was recording NAN; I powercycled the NAN sensors and they restarted fine. I downloaded data from the intercomparison CR1000, wired in a METER Atmos14 sensor (sn??), and updated a new program to the intercomparison CR1000. There are no space in the METER radiation shield to add a fan, so I left it unaspirated for now. The Atmos14 sensor had an air temperature of 18.2C, RH of 39%, AirP of 102.6 kPa, and a VPD of 0.807. The HMP155 had an air temperature of 16.4C and RH of 45%.

We swapped the LI-7500 for calibration: sn 75H-2150 came down and sn 0042 went up. I uploaded a new config file, updated the pressure coefficients, and reset the box.

LI-7500 readings (sn 75H-2150 --> sn 75H-2150 after cleaning --> sn 0042):
CO2 434ppm --> 454 --> 456
H2O 433ppm --> 380 --> 356
T 16.4C --> 16.6 --> 18.1
P 102.5kPa --> 102.5 --> 102.5
SS 93--> 102 --> 100
LI7700 readings:
CH4 2.4ppm --> 2.3 after cleaning
RSSI 11 -->75 after cleaning

We left at 12:30 PST.

3 photos found

20201203WP_TempIntercomparison.jpg ( 2020-12-03 12:23:17 ) Full size: 1440x1920
HMP155, METER Atmos14, and HMP60 intercomparison at WP