Field Notes

When: Date: 1/17/2005 , Day: 17 , Watch Time: 12:35pm .
Where: Tonzi/Vaira Ranch
Who: Siyan
Weather: Cloudy, foggy, very wet on the grass

Phenology: green grass

Summary

1. No power for the fence of soil CO2 profile system.
2. Tower site worked well. The attachment of computer need fix.
3. Floor and Vaira Flux systems shut down because of “LVD”. After restart the power regulator, flux systems are working.
4. Swap Li-7500 in floor site (Remove sn 0073, install sn 0418). #73 will be sent back to Li-cor for re-calibration.
5. Measure soil moisture.
6. Collect leave samples: Vaira grass, Tonzi understory grass

Tonzi_Tower Site

1. Fence and gate power: >12 v.
2. Panel and Batteries: 12.0 v; 0.0 amps; 3.5 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	13:59:58
   Path/File name	D:\data\T05_17.flx, D:\data\TW05171030.flx
   	mean	std		mean	std
   w	0.02	0.251	Ts	8.707	0.114
   u	-1.13	0.445	H2O	1.902	0.02
   v	-0.55	0.329	CO2	2.131	0.017

4. I couldn’t download data because I couldn’t find the mouse. .
5. Check calibration cylinders;
   CO₂ 1500 psig; flow 10 psi.
   N₂ 500 psig; flow 10 psi.
6. Close gate and set up fence.

Toniz_Floor Site

1. Fence and gate power: >12.0 v.
2. Panel and Batteries: 12.3 v; 2.9 amps; Lvd amps. After restart, “Lvd” changed into 4.2 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	14:42:05
   Path/File name	FL5_17.flx
   	mean	std		mean	std
   w	0.09	0.113	Ts	11.568	0.195
   u	0.01	0.681	H2O	0.001	0.001
   v	0.34	0.816	CO2	2.976	0.024

4. Download data.
5. Readings were OK from Gillsonic screen after downloading data or swaping Li-7500 Analyzer. (Remove sn 0073; install sn 0148)

   Time	15:05:41
   Path/File name	FL5_17.flx
   	mean	std		mean	std
   w	-0.4	0.168	Ts	11.064	0.167
   u	1.03	0.931	H2O	2.104	0.021
   v	0.176	0.317	CO2	2.367	0.008

6. No power on the fence of soil CO2 profile system.
7. Close gate and set up fence.