Field Notes

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Tonzi: 2011-07-20 12:30:00 (DOY 201)
Author: Joe Verfaillie
Others: Siyan

Summary: Change z-cam 1 and 2 program to sunset version, measured tower instruments.

Tonzi
2011-07-20

I arrived about 12:30 with Siyan. It was sunny, clear and hot. There was a nice breeze from the west but it seemed to vary from northwest to southwest. The grass is almost completely dead with only a hint or green and a few flowers in low shady spots. The trees look good. The big oak by the road had quite a few acorns starting. I didn’t notice acorns on the other trees.

I checked the z-cams cleaning their windows. I updated the program on the CR10X that controls z-cam one and two. The new program uses a 5th order polynomial to approximate the time of sunset and takes four photos at sunset-3hr, -2hr, -1hr and at sunset.

I did the moisture point measurements.

The tram was running.

I brought out one of the mis-ordered 2% CH4 tanks to give Siyan a higher pressure for water potential. The new tank was at about 1000psi and old N2 tank was at 500psi which is just about the water potential of the leaves.

I measured the height of things on the tower:

The IRGA and sonic centers are 23.5m above ground
The HMP45 and radiometers are 21.7m above ground
CO2 profile inlets are at 22.82m, 5.96m, 1.80m and 0.47m above the ground
Solar panels are at 18.00m, 16.16m, 14.31m and 12.49m

I check on which program is currently loaded for the CO2 profile system: MEASUR21.DLD, and copied it to flash memory.

I brought in the unused box with solar charger controller just west of the base of the tower.

Field Data

No tank data

Well Depth