When: Date: 8/23/2007 , Day: 235 , Watch Time: 10:30am .
Where: Tonzi/Vaira Ranch
Who: Siyan, Stefania
Weather: clear, hot, nice breeze
Phenology: leaves of oak tree started to turn to brown, depended on the locations. For many small trees, more than >80% leaves looked brown. For big trees, brown leaves < 10%. Looks like brown leaves appeared around Aug. 10^th have fallen off.
Summary

1. N2 tank is very low.
2. Swapped Li-7500 on Tower. H2O channel still around 3.0 volts.
3. Downloaded data at Tower, Floor, and Vaira. Three EC systems worked well.
4. Helped Stefania collecting leaf samples for sugar isotope.
5. Took spectrometer measurement at Vaira.
6. Couldn’t make TDR probe measurement maybe due to bad connections between cable and TDR machine.

Vaira_Grass Site

1. Fence and gate power: 12 v.
2. Panel and Batteries: 12.7 v; 5.8 amps; 3.4 amps.
3. Reading from Gillsonic screen before downloading data. (The value of H₂O and CO₂ should be in the range of 0 – 5 v.)

Time
Path/File name	D:\Data\V07_ 235 .flx D:\Data\VR07 .raw
	mean	std		mean	std
w	0.23	0.287	Ts	41.7	1.06
u	-0.44	1.316	H2O	2.19	0.108
v	0.77	1.008	CO2	1.369	0.015
			Tc	3.907	0.102

1. downloading data
2. check the fans of air temp. and relative humidity sensors at Vaira. OK.
3. Check MD-9 system connections. OK.
4. Check levels of Radiation sensors, clear up surfaces. Yes.
5. Closed gate and set up fence.

Tonzi_Tower Site

1. Fence and gate power: No Fence On v.
2. Panel and Batteries: 13.2 v; 0.0 amps; 6.5 amps.
3. Reading from Gillsonic screen before downloading data. (The value of H₂O and CO₂ should be in the range of 0 – 5 v.)

Time
Path/File name	D:\Data\T07_ 235 .flx D:\Data\TW07 .raw
	mean	std		mean	std
w	1.22	0.68	Ts	33.9	2.5
u	1.29	0.04	H2O	3.936	0.234
v	1.0	0.92	CO2	1.413	0.078

1. downloading data
2. swaping Li-7500 Analyzer. (Remove SN# 976 ; install SN# 418 )
3. check the fans of air temp. and relative humidity sensors on the tower and the floor.
4. Check calibration cylinders;

CO₂ 800 psig; flow 20 psi.
N₂ 150 psig; flow 20 psi.
Manually calibrate Li-800. Following Ted’s instruction: H:\IoneSavanna_2004\Tower_2004\CO2Profile\LI800_Calibration_Procedure_2Nov04.txt
Is the pump running‌
How to check the CO2 values‌ Click “Ports/Flags” button to see which ports or flags is setting high. Pressure should be less than ambient value. When Flag 8 is high, it may indicate that RRR’s battery is low.

1. close gate and set up fence. OK.

Toniz_Floor Site

1. Fence and gate power: 12 v.
2. Panel and Batteries: 12.9 v; 4.3 amps; 2.1 amps.
3. Reading from Gillsonic screen before downloading data. (The value of H₂O and CO₂ should be in the range of 0 – 5 v.)

Time
Path/File name	D:\Data\F07_ 235 .flx D:\Data\FL07 .raw
	mean	std		mean	std
w			Ts
u			H2O
v			CO2

1. downloading data
2. Check MD-9 system connections. OK.
3. CR10X7 – CO₂ profile

383.8	382.0	383.5	382.7
928.7	928.8	928.8	928.6
48.5	48.35	48.3	48.4
50.7	50.7	50.8	50.8

-0.936	396.0
933.14	928.7
44.7	45.09
49.5	49.5

CR10X8 – wind profile

1. Soil CO₂ profile: probes are in the lab for calibration.
2. Close gate and set up fence. Yes.