Field Notes

West Pond: 2022-04-13 12:35:00 (DOY 103)
Author: Daphne Szutu
Others: Koong

Summary: Regular data collection/cleaning, 7700 power problem--brought back to lab, missing 2 days of flux data, swapped 7500 for calibration

2022-04-13
West Pond

Koong and I arrived at 12:35 PDT. It was a breezy, gust day, partly floudy with a mix of clouds. The water level has come up a bit again and the staff gauge read 83cm.

I had trouble connecting to the 7700—it wasn’t showing up in the 7700 software and it was “disconnected” in the 7550 software. I checked that it was getting enough voltage and the cables at the bottom of the sensor were secure. We looked at the LED indicator lights underneath the sensor—the power light was blinking (instead of steady on) and the ethernet and status lights were both off. On the power cable, the plastic protective collar was cracked and I could see the individual wires inside, but the insulation on the wires was intact and I didn’t see any corrosion. After phone consultation with Joe, we tried connecting to the sensor with 2 different power cables (borrowed the other one from the 7550) and with 2 different ethernet cables directly to the laptop. No dice. We brought back 7700 sn TG1-0421 and its power cable to the lab for further testing. We placed the 7700 in the backseat, cushioned it with spare jackets, and secured it with a seatbelt.

I disconnected the 7700 ethernet connector inside the 7550 box to make extra sure no powered cables were exposed to the elements. I meant to ziptie the wash tubing and power cable to the scaffolding so they wouldn’t flap around in the wind, but forgot.

I wanted to remove the 7700 columns from the GHG file since we were removing the sensor, but since the sensor was disconnected in the 7550 interface I couldn’t edit the columns. Probably the columns are not being saved. This must be a new feature in one of the recent 7550 interface version.

I downloaded met, cam, and USB GHG data. The last GHG file was from a few days ago, so the 7700 issue probably messed something up in the logging. I could still connect to the 7550 fine, just that the 7700 was shown as “disconnected”. Koong cleaned flux and rad sensors. We topped off the wash reservoir.

We swapped the 7500 for calibration: sn 0035 came off and sn 0073 went up. I uploaded a new config file, updated the pressure coefficients, and reset the box. The eddy clock looked fine so I didn’t adjust it.

LI-7500 readings (sn 0035 --> sn 0073):
CO2 412 ppm --> 419
H2O 332 mmol/m3 --> 318
T 15.8C --> 18.8
P 102.3kPa --> 102.3
SS 98 --> 100
LI7700 readings:
No readings b/c couldn’t connect to sensor

We left at 13:45 PDT.

0 photos found

8 sets found

Can't check WP_DO
1 WP_DO graphs found