Field Notes

Hill Slough: 2023-07-11 15:24:00 (DOY 192)
Author: Daphne Szutu
Others: Carlos

Summary: Regular data collection/cleaning, hot day, low tide, swapped 7700 for calibration, visited USU/USDA advection experiment in almond orchard near Vacaville

2023-07-11
Hill Slough

Carlos and I arrived at 15:24 PDT. It was super low tide. Clumps of tules and cattails are coming up on the eastern edge of the marsh. It was warm and windy, but at least the wind had a slight cooling effect. There will be another heat wave this weekend with temperatures >35C Friday through Monday.

The wash reservoir was 1/3 empty, we refilled it. Carlos cleaned flux and rad sensors. I downladed met, cam, and USB GHG data. I changed the eddy clock +1min from 14:02 to 14:03 to match the laptop time and restarted logging.

We swapped the 7700 for calibration with a 7700 which came back yesterday fresh from the factory after repairs for extensive water damage. It’s been so consistently windy here that it’s hard to find a good day to do in-situ 7700 calibration. Sn TG1-0211 came off and sn TG1-0421 went on. Carlos reattached the spray nozzle and put its spiky hat back on. We tested the spray and spin to make sure the nozzle was positioned correctly.

On the fresh 7700, I updated a bunch of settings from memory.

Top heater: 5% power, ambient offset 2C, 20:00-06:00
Bottom heater: 5% power, SS threshold 30%, 20:00-06:00
Cleaning: Spray 15sec, spin 45sec, SS threshold 30%, check every 3 hours
IP address: 192.168.2.77, Mask 255.255.255.0, Gateway 192.168.2.1
Time: PTP slave, Timezone ETC/GMT+8

After these changes, I rebooted the 7700 and made sure it was connected in the 7550 software. All looked ok.

Carlos cleaned the primary staff gauge, but the water level was too low to read there. The secondary staff gauge by the channel had a bunch of algae(?) growing on it. Neither of us could read it, so no staff gauge reading from today. I cautioned Carlos against climbing down, but he started to anyways and got a splinter in his finger. I’ll change the gauge orientation soon.

I downloaded the miniDOT data and changed its desiccant. I knocked off a bunch of dried hairy algae on the miniDOT's yellow plastic chain and from the top of the EXO all around the handle.

The 7500 read: 403ppm CO2, 515mmol/m3 H2O, 31.2C, 101.4kPa, 97SS – 98 after cleaning
TG1-0211 read: 1.93ppm CH4, 48RSSI
TG1-0211 clean read: 2.0ppm CH4, 62RSSI
TG1-0421 read: 1.97ppm CH4, 79RSSI

We left at 16:10 PDT and went to visit Carlo’s friends (Larry Hipps, Joe Alfieri, and Larry’s new grad student Ashley) who were setting up an advection experiement in an almond orchard east of Vacaville. They had two separate UAVs: one was a hybrid fixed-wing/VTOL UAV that measured 20cm thermal bands and one was a quadcopter that measured 40-ish optical bands. There was also one upwind tower, one main tower, and an intercanopy tower. The main tower and the intercanopy tower were adjacent and had at least 7 Campbell IRGASONs at various heights between the two of them. I also saw some Arables on their main tower. Larry, Joe, and Ashely are heading to Fresno on Friday for another week of experiments (it’s gonna be HOT). This is a long-term site for UCD folks who had plant physiology equipment, soil moisture profiles, and a bunch of other stuff. There was a aerosol lidar (wind speed profiler?) from Sonia Wharton that was set up on the edge of the field. We headed home around 18:15 PDT.

0 photos found

4 sets found

20 HS_met graphs found