Field Notes

When: Date: 9/21/2004 , Day: 265 , Watch Time: 11:00 am .
Where: Tonzi/Vaira Ranch
Who: Siyan
Weather: Sunny, breeze, not hot
Phenology: Oak leaves looked more yellow. Dead grass.

Summary & Problems

1. I swapped Li-7500 in Vaira site.
2. Soil surface was still extremely dry. I didn’t see any evident of rain in both sites. Soil moisture measurement was done.

Vaira_Grass Site

1. Fence and gate power: > 12.0 v.
2. Panel and Batteries: 13.1 v; 17.8 amps; 2.0 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	10:04:42
   Path/File name	D: VR4_265.Flx 1023.933
   	mean	std		mean	std
   w	0.06	0.33	Ts	19.933	1.534
   u	3.22	1.165	H2O	2.18	0.685
   v	-1.1	1.534	CO2	1.789	-0.3

4. Download data.
5. Swap Li-7500 Analyzer. (Remove sn 0042; install sn 0041)
6. Readings of last look

   Time	10:31:37
   Path/File name	D: VR4_265.Flx
   	mean	std		mean	std
   w	-0.08	0.451	Ts	21.043	0.961
   u	2.88	0.814	H2O	1.107	0.236
   v	0.82	1.912	CO2	1.859	0.24

7. CR23X with two multiplexers were working well:
   Sys_vot = 2.0228
   PC_start = 2.1340
8. Radiation sensors’ surfaces were clean.
9. Closed gate and set up fence.