Field Notes

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Sherman Island: 2008-07-15 15:00:00 (DOY 197)
Author: Dennis Baldocchi
Others: Siyan

Summary: Soil to hard for inserting Tsoil and found that parallel winds may be bringing methane to flux tower.

Sherman Island - Methane Study

Date	July 15 2008	DOY
Standard Time in	1500	Time out	1600

Who: ddb, Siyan

Weather: clear, mild and windy from the Bay

Phenology: Pepperweed in full bloom.

Check list

Fance and gate

Gill sonics

w	0.10	T	24.1
u	6.51	H20	3.8
v	5.9	CO2	1.13
		CH4	1.81

Methane Sensor (type Scroll Scroll 1)

Hi-flow ppm	ok
Cell Pressure â€“ near 159	140	We either need to reset
Mirror time	16.3	Was 18 last time but there have been lots of fires. Its holding ok
Sample rate	10
Low flow. put back in high flow !
Pump hours	1628
Filter Status
Water traps	clean
Air conditioning	70F	Its too cool so I changed the flow from hi to low..lets watch it

Datalogger

Batt volt	12.1
fans of air temp/RH sensors	ok
Radiometric sensors	ok
Water Table depth (inches)

If Swapping Li-7500 Analyzer

Remove SN#
Install SN#

Additional Tasks

Water table depths off fence (inches)

South

North

Vegetation height â€“ 20 samples (inches)

Other Notes:

Tair 24.3, rh 60, water pressure 0.31

Have fixed the Tsoil in the lab, but soil is real hard to insert.

Walt is irrigating the fields next to Mayberry slough. Winds are slightly parallel but I think they may be running across these fields too and bringing some methane to the flux tower. We need to look at recent wind roses. There was some methane structure to the signals.

1 photos found

SI_webcam_2008196_1237.jpg ( 2008-07-14 11:37:04 ) Full size: 640x480
People in the field