Field Notes

Sherman Island: 2007-04-26 12:00:00 (DOY 116)
Author: Dennis Baldocchi
Others: Matteo Detto & Ted Hehn

Summary: Calibrated methane sensor. Downloaded Sherman Island data. Took TDR soil moisture readings. Took spectrometer reflectance readings.

When: Date: 4/26/2007 , Day: 116 , Watch Time: 1200 .

Where: Sherman Island Methane Study

Who: ddb, th, md

Weather: clear, windy, west winds, mild temperature; field to the due east is flooded and with ducks etc. fetch has dry field

Phenology: pepper weed about 70 cm tall.

Installed new and improved cow fence

Tasks

Sherman Island Pasture Site

Fence and gate power: ok v.
Datalogger Solar Panel and Batteries: 11.9 v; voltage is drawing down
Reading from Gillsonic screen before downloading data. (The value of H₂O and CO₂ should be in the range of 0 â€“ 5 v.)

Methane Sensor
1. Cell Pressure (near 159 Torr?):_____159.4
2. Cell Temperature: _____29.6
3. Double Check

i. Sample rate: 10Hz?:__ok_

ii. Methane ppm Hi flow:

iii. Methane ppm, low flow (remember to put back in high flow:

iv. Pump status??:____

v. Filter Status:______

Calibrated the methane sensor with the NOAA CMDL standard 1897.8 ppm.

With the standard the reading was 1901 ppb.

After we reset calibration and it became 1897 ppb again. A 4 ppb drift over 20 days of operation.

vi. Check Water in tube:

3 feet, 5.5 inches at reference (41.5 in) or 1054 mm at 400 mm above soil.

Water Table at 65.4 cm.

P 101.9 kPa, T 23.4C, rh 45%, Tsoil 24 to 16C, 16C at 50 cm, profiles look good.

Theta probes about 800 mv

Closed gate and set up fence.

Soil moisture - TDR probes			Date:	jDay 116	Name: ddb
Battery (v) - the first reading after turn on				measurements started from
Site	SN#	Depth	Reading1	Reading2	Reading3
Sherman Island
#1 East in fence	0FEDDAA1	0-15	36.4	36.1	35.5	1
		15-30	35.6	35.6	36.2	1
		30-45	43.8	44.9	44.4	1
		45-60	95.5	89	86.1	1
#2 West in fence	AB5408F	0-15	24.1	20.6	24.4	2
		15-30	31.3	32.3	30.4	2
		30-45	33.8	36.8	35.7	2
		45-60	95	109.9	111.1	2
#3	FED8688	0-15	22.3	23.2	23.5	3
		15-30	33.8	35	35	3
		30-45	48.8	48	48.8	3
		45-60	104.4	87.2	98.7	3
#4 Middle T	0FED7C67	0-15	28.2	27.3	27.6	4
		15-30	26.8	26.5	26.8	4
		30-45	45.5	45.5	46.3	4
		45-60	68.9	68.9	66.9	4
#5 South T	0A6D8356	0-15	27.6	28.5	27.9
		15-30	27.4	26.8	26.8
		30-45	38.8	38.5	38.8
		45-60	79.2	83.8	75.2
#6 North T	0FEDDO1B	0-15	32.9	32	32
		15-30	29.5	29.5	30.1
		30-45	46.6	47.7	47.2
		45-60	62.6	60.9	60