Field Notes

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Twitchell Rice: 2010-05-28 12:30:00 (DOY 148)
Author: Joe Verfaillie
Others:

Twitchell
5/28/2010

Arrived about noontime PDT. Clear, warm, light wind from the north. The field looks green but mostly broad leaf weeds. Jim says next week the field will get herbicide and maybe fertilizer. Flooding probably starts the following week.

The LGR was in slow flow mode when I arrived and the CO2 channel had not line locked. I put it back in high flow and CO2 locked, then I shut it down and restarted and it came up in high flow mode correctly.

13:06, 24.50C, 143.82Torr, 14.015usec, 10Hz, 1.8772ppm, 10335.4ppm, 386.52ppm

The 40um filter seemed plugged up so I swapped it out with a new one.

I replaced the existing web cam pole with a folding one and mounted the plantcam on the top. Still running on AA batteries and SD card – totally self contained.

I swapped out the LI7500 with freshly calibrated one. Sn 0418 off, sn 1594 on.

I measure the flow rate of air exiting the diaphragm pump at about 10lpm. This was the max of the flow meter I had but the LGR cell pressure did not change much when the flow meter was inline. Still I should order a slightly larger flow meter.

I swapped out the HMP45 solar shield because of a dead ventilation fan.

I measured the locations of instruments:

Sonic: center 323cm above ground
LI770 was: path bottom 287cm, path top 340cm, center 313cm above ground, 28cm SE of sonic.
LGR inlet: 15cm west of LI7700.

Measured well: bottom of well 119cm below top of pipe.
Water was 98cm below top of pipe.
Top of pipe is 20cm above ground surface.

Need new washers for LI7500 mount.

1 photos found

20100528TW_TowerFieldClouds.jpg ( 2010-05-28 13:22:14 ) Full size: 3648x2736
Equipment box and eddy tower at edge of weedy rice field with scattered puffy clouds