Field Notes

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Other sites visited today: West Pond
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East End: 2017-08-04 12:00:00 (DOY 216)
Author: Daphne Szutu
Others: Joe Verfaillie

Summary: Fixed power at T2 (Closed Veg), T1 (Open Water) still off line, Collected camera data at Permanent tower

2017-08-04
East End

Temporary Tower #2 Closed Veg

We arrived at 12:00. It was overcast, warm, and breezy. There was no power at the tower and many of the thermocouple wires had been chewed. The ethernet cable between the 7550 box and the datalogger enclosure had been nibbled on, so we removed it. You can use an ethernet cable to directly connect the laptop to the 7550.

The two soil heat flux plates had been chewed off their wire. Joe recovered one flux plate; we trimmed off the chewed wire and reconnected it to the AM25T, port 15. This plate was reinstalled in the muck ~2cm deep, between the farther thermocouple stake and the SW corner of the tower. We did not find the other soil heat flux plate.

We tested the connectivity of the power wire and it was good. Joe swapped out the charge controller for a new one because the old one had some melted plastic by one of the screw terminals, and he remembers the old charge controller as being problematic in the past. With the new charge controller, we had power at our tower.

We downloaded the camera data and angled the camera down, but I couldn't check the final view with the current web interface. The camera clock was off: When the laptop said it was 12:40 PST, August 4, the camera clock said it was 7:05, July 3.

I checked the flux and met data and cleaned the flux sensors. The 7700 was very dirty because there had been no power in the past 2.5 weeks.

LI7500 readings:
CO2 372.2
H2O 792.1
T 30.3
P 100.8
SS 88.4 --> 91.3 after cleaning

LI7700 readings:
CH4 1.3
RSSI 2.5 --> 69.6 after cleaning

We left at 13:35.

Temporary Tower #1 Open Water

We arrived at 13:40. It was overcast, with a small breeze.

There was no power at the tower, and Joe did not see anything obviously wrong with the power line. It had been chewed a little bit in some places, but the power line is so thick (14 AWG) there was not much damage.

At the charge controller, we had 24 V, but it dropped to 3V at the flux scaffolding. The resistance was 0.8 MÎ© along the power line, which is quite high.

I downloaded the met data. The met battery was 12.9 V. Joe leveled the net radiometer; it looked like something had sat on it and was angled down.

We left at 14:45.

Permanent Tower

We arrived at 14:50. I swapped the camera card and then left.

0 photos found

11 sets found

14 EE_met graphs found