Field Notes

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Mayberry: 2025-01-15 12:05:00 (DOY 15)
Author: Daphne Szutu
Others: Joe, Kuno

Summary: Installed miniCH4 sensor, installed new sonic rangefinder, swapped 7500 for calibration, training Kuno on data download

2025-01-15
Mayberry

Joe, Kuno, and I arrived at 12:05 PST. It was a calm, sunny, and cool day with hazy horizons. The staff gauge read 59cm. Today I’m training Kuno on downloading Delta data.

The wash reservoir was 80% full and we refilled it.

Kuno and I downloaded met, cam, and USB GHG data. We also swapped the LI-7500A for calibration: sn 75H-2182 came off and sn 0065 went on. Kuno uploaded a new config file and updated the pressure coefficients. There was an error (slow blink on the LED status light) when we inserted the new USB, but all seemed fine after resetting the 7550 box.

Kuno cleaned flux and rad sensors. I measured the surface water conductivity.
Surface, 1940uS, 9.0C

The floating bucket is brittle and half of its lid is missing. Joe brought a replacement bucket today to swap out but the current hardware was all rusted, so he’ll try again another time with more supplies.

Joe swapped out the sonic rangefinder for a new one sn ??. I wired it to the same SE data channel on the datalogger. The old rangefinder was wired to a C port for a trigger but this one doesn’t have a trigger wire. I accidentally wired it to 12V instead of 5V. After I moved it to 5V, It was giving a reasonable number around 29mV (~29mm), but not sure if it’s fully working after it got 12V when it was only expecting 5V.

Joe installed a miniCH4 sensor that we are borrowing from Sheel Bansal. It is connected to the 12V power strip inside the met box; Kuno drilled a new hole in the enclosure in order to get the sensor cable head through. It is storing data internally. Joe tried to talk to it on his field laptop over CoolTerm, but it wasn’t responding. He tugged on the cable leading to the sensor and part of the cable connector came off from the sensor. Kuno put on the soggy waders and got in the water to remove the sensor. Joe re-assembled the cable connector, connect to the sensor (“it should be wet-mateable”) and was able to communicate through the terminal. Kuno installed the sensor back underwater, using cable ties to secure it to the northeastern leg of the scaffolding. We saw some reasonable numbers on the terminal window. I think we set it to continuous mode so it is saving measurements taken every ~1.6 seconds.

2182 old read: 441pm CO2, 383mmol/m3 H2O, 13.9C, 101.8kPa, 99SS
0065 fresh read: 445pm CO2, 303mmol/m3 H2O, 15.1C, 101.9kPa, 100SS (reset from 96)
7700 read: 2.4ppm CH4, 49RSSI — 73 after cleaning

We left at 13:30 PST.

0 photos found

11 sets found

7 MB_flux graphs found