Field Notes

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Other sites visited today: Bouldin Corn | East Pond | Sherman Wetland | Mayberry
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West Pond: 2018-10-25 12:40:00 (DOY 298)
Author: Daphne Szutu
Others: Joe

Summary: Calibrated 7700, swapped 7500 for calibration, removed eosense CO2 probe, opened inlet 1 turn

2018-10-25
West Pond

Joe and I arrived at 12:40 for a maintenance trip. It was sunny and warm, calm, with some clouds near the horizon. The water level was low; there was no standing water (WL was 27 cm). On the way out, we opened the inlet 1 turn.

The eosGP sn GP20140018 was out of the water and still reading 6% CO2 (~5V), so we brought it back to the lab for testing. I downloaded the met data. Joe added some split loom to the radiometer cables.

We calibrated the LI-7700, sn TG1-0224. Before calibration, Joe cleaned the sensor thoroughly, including the cap. The optics RH was 22%, so we ran some zero air in the headspace. When optics RH dropped down to 13%, we sealed the headspace again and started the calibration.

LI7700 readings:
(before cleaning --> after cleaning --> after calibration)
CH4 2.15ppm --> 2.07 --> 2.06
RSSI 51 --> 70 --> 70

We also swapped the 7500 for calibration: sn 0042 came down, sn 75H-2182 went up. I uploaded the new config file, and updated the pressure coefficient. After the 7700 calibration, I restarted the box and confirmed that the 7700 was connected in the 7550 software, the GHG columns were good, and USB was logging.

LI-7500 readings:
(sn 0042 --> sn 0042 clean --> sn 75H-2182)
CO2 408ppm --> 408 --> 415
H2O 535ppm --> 530 --> 425
T 25.1C --> 24.5 --> 25.9
P 101.9kPa --> 101.8 --> 101.9
SS 99 --> 100 --> 86.9

We left at 13:40.

0 photos found

8 sets found

Can't check WP_DO
1 WP_DO graphs found