Field Notes

When: Date: 7/23/2008 , Day: , Watch Time: .

Where: Sherman Island Methane Study

Who: Dennis Baldocchi and Ben Runkle

Weather: clear, windy and warm temperatures.

Phenology

Pepperweed is in full blossom. The plants came back after mowing.

Tasks

1. check and download data at Sherman Island
2. Take TDR soil moisture readings
3. take spectrometer reflectance reading
4. Sample additional water Table ports
5. Sample LAI and plant height

Installed the soil temperature sensors, a 50 cm probe (#1) and a 32 cm probe (#3). The sensors were tested in the lab before installation by comparing outputs in a water bath. All agree well. Expoxy was put over the soldered tcs. Blue is positive and Red is negative. Important to remember.

Used fence post pile driver to install the soil sampling tube, which is about the same diameter as the soil TC probes. Need to wait a few days for them to re equilibrate

Sherman Island Pasture Site

1. Fence and gate power: v.
2. Datalogger Solar Panel and Batteries: v;
3. Reading from Gillsonic screen before downloading data. (The value of H₂O and CO₂ should be in the range of 0 – 5 v.)

3. 1. Methane Sensor
   2. Cell Pressure (near 159 Torr?):_139 torr; 160 torr at low flow_
   3. Cell Temperature: ____35 c
   4. Time Constant:_15.5 microseconds
   5. Double Check

i. Sample rate: 10Hz?:__yes__

ii. Methane ppm Hi flow:

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

iv. Pump status??:__ok__

v. Filter Status:___clean___

vi. Check Water in tube:clean

4. downloading data
5. If Swapping Li-7500 Analyzer. (Remove SN# ; install SN# )
6. Check the fans of air temp. and relative humidity sensors
7. Check MD-9 system connections
8. Check CR23X with two multiplexers and sensor values
9. Check levels of Radiation sensors, clear up surfaces.

Closed gate and set up fence.

Cleaned KZ net radiometers. Lots of peat dust on the windward side of the lower portion of the domes. Is obscuring some radiation inputs!

Met conditions

Cr 10x volts 12.12

Tair = 30.57

RH 30%

Wter P= 0.29

Pressure 101.1 kPaa

Ben took soil moisture measurements separate