Field Notes

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Tonzi: 2012-04-23 11:00:00 (DOY 114)
Author: Joe Verfaillie
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Summary: CO2 profile still limping along, fixed soil co2 system.

Tonzi
2012-04-23

I arrive about 11:00PDT. It was warm and mostly sunny, the morning clouds having mostly blown off to the west. It is dryer here too with the puddles in the road largely gone.

I checked on the CO2 profile system on the tower. The solenoid for the fourth, top location is still sticking but now badly. The pump lugs down a little at first, but by the time the measurements are made the pressure in the cell is fine. I’ll get a replacement better prepared and tested in the lab for another time.

The tram was running.

I replaced the power supplies for the CR23X and CR10X that run the soil CO2 measurements. The CR10X was still getting strange readings on the last CO2 channel. Finally I looked inside the transmitter and discovered it was mis-wired. Instead of 0 and mA the signal line was connected between the 0 and V. I’m not sure of all the implications but after fixing this things seemed much better. I reconnected the CR10X to the CR23X by SDM and all the data were being captured by the CR23X.

The readings from the tree two co2 sensors were:
Probe, co2, mV
1, 3820ppm, 916.48
2, 4150ppm, 999.59
3, 1.24%, 987.52

The probe three resistor is 120.9 Ohms.

Sensors at the tower top were clean. The floor HMP45 fan is dead. Data on both computers looked okay.

Field Data

No tank data

No TZ Well data found

No TZ Moisture Point data found

No VR Moisture Point data found

No TZ grass heigth found

No VR grass heigth found

No TZ Tree DBH found

No water potential data found

No TZ Grass Biomass data found

No TZ OakLeaves Biomass data found

No TZ PineNeedles Biomass data found