Field Notes

Hill Slough: 2023-09-12 17:40:00 (DOY 255)
Author: Daphne Szutu
Others: Joe

Summary: Regular data collection/cleaning, no CR23X data for the past week--removed shorted CTD sensor

2023-09-12
Hill Slough

Joe and I arrived at 17:40 PDT. It’s been three weeks since the last site visit. I meant to come last week but Kyle and I were sampling methane bubbles at Mayberry and ran out of time to finish all of the Delta sites. It was sunny with the usual wind.

The staff gauge read 5.25ft at 16:43 PST. Joe observed that the solar panels were dirty—to be cleaned another time.

Joe cleaned flux and rad sensors. I downloaded met, cam, and USB GHG data. I changed the eddy clock +1 min from 16:51 to 16:52 PST and restarted logging.

There was no data coming in since Sept. 5 from the channel CR23X (EXO, HYDROS21 CTD, eosGP). Joe went to inspect the CR23X. Even though the data logger was receiving 12V, it was only outputting ~1.2V on its 12V ports where the sensors were powered. He rewired the sensor power lines to a terminal strip and noticed that the HYDROS21 cable felt warm; he disconnected it and the other sensors started working. The 23x 12V port also seemed okay with out the HYDROS21 connected but we left the other sensors of the terminal strip. Checking with the multimeter using 10A DC current mode the HYDROS21 was trying to pull multiple amps. We removed the HYDROS21 sn 1782503941 for RMA.

I went to go check the data again the CR1000 at the tower and noticed that the mux power seemed to be spotty—it wasn’t clicking every 10 sec consistently. Joe pushed on the mux's pluggable connectors, which seemed to stabilize things. Something to keep an eye on.

I downloaded the miniDOT, swapped its desiccant, and put in fresh batteries as part of its ~annual swap. The new pantyhose stayed on fine with the cable tie, although there are a few holes starting to form.

The 7500 read: 404ppm CO2, 730mmol/m3 H2O, 24.8C, 101.2kPa, 100SS – 101 after cleaning
The 7700 read: 2.0ppm CO2, 50RSSI – 80 after cleaning

We left around 18:30 PDT.

0 photos found

4 sets found

20 HS_met graphs found