Field notes

Riet Vell: 2025-07-24, 8.00-9.30h UTC (DOY 205)

Date & Time

24/07/25

Author

Angèlica

Other participants

Ariane

Field report

Weather: Fully covered sky.

We refilled the water bucket, which was completely empty.

We cleaned the sensors, that were again covered with spiders and spiderwebs. The RSSI signal was extremely low. We sealed the cap of the methane sensor with black tape, hoping it will help prevent future infestations.

Met and flux data were downloaded, and the plots showed correctly at the smartflux software. The USB memory was erased, leaving 12 GB free out of 14 GB.

Regarding the clock synchronization, we observed that the LI-7500 and LI-7700 were running one minute behind the PC clock, while the datalogger was one second behind.

For the next visit, we need to apply more anti-insect bags, replace the cable of the HMP ventilator, ask Albert about the CO2 sensor’s paint, and check the RV offset program’s end time.

Water Level:  10, 10, 9, 6, 6, 6, 4, 5, 7, 8-> Mean: 7.1 cm

Veg height: 80, 90, 80, 130, 95, 70, 100, 105, 70, 85. Mean= 90.5 cm

SN: Li-7700=TG1127, Li-7500=75D5107, Sonic= 242504

Readings:

  Before cleaning sensors After cleaning sensors
LI-7500 readings
CO2 ppm 413 368.96
H20 ppm 712 736
T ºC 21.77 21.66
P kPa 101.58 101.52
SS % 87.17 99.34
LI-7700 readings
CH4 ppm -1.72 2.23
RSSI % 0.15 75.87