Field Notes

When: Date: Dec. 15, 2004 , Day: 350 , Watch Time: 11:30am .
Where: Tonzi/Vaira Ranch
Who: S.M. and J. C.
Weather: very foggy on the way, partial cloudy on the site
Phenology: green grass and no-leave tree

Tasks

1. Check Flux systems and swap three Licor-7500s.
2. Spectrum measurements
3. Alex’s isotope samples
4. Measure soil moisture
5. Collect leave samples: Vaira grass, Tonzi understory grass

Vaira_Grass Site

1. Fence and gate power: >12 v.
2. Panel and Batteries: 13.0 v; 22.7 amps; 1.7 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	11:32:24
   Path/File name	VR4_350.flx
   	mean	std		mean	std
   w	0.07	0.211	Ts	14.788	0.571
   u	-0.05	0.599	H2O	2.9	0.076
   v	0.77	0.589	CO2	0.831	0.026

4. Download data.
5. Readings were OK from Gillsonic screen after downloading data or swapping Li-7500 Analyzer. (Remove sn 0418; install sn 0041)

   Time	11:59:31
   Path/File name	VR4_350.flx
   	mean	std		mean	std
   w	0.2	0.27	Ts	14.228	0.443
   u	-0.27	0.425	H2O	2.033	0.064
   v	1.25	0.564	CO2	2.073	0.041

6. Check CR23X with two multiplexers
   Sys_vot = 1.9657
   PC_start = 2.1298
7. Close gate and set up fence.