Field Notes

<--2015-05-21 12:15:00 | 2015-06-25 11:45:00-->
Other sites visited today: Twitchell Alfalfa | East End | West Pond | Mayberry
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Twitchell Rice: 2015-06-09 13:45:00 (DOY 160)
Author: Joe Verfaillie
Others: Patty, Dennis, Miguel

Summary: Field is flooded, may have been sprayed with herbicide, standard data collection, clip plots

Twitchell
2015-06-09

I arrived about 1:45pm with Dennis, Patty and Miguel. It was warm and overcast with a strong wind from the west. The field has been flooded and some of the weeds look yellowed as if they had been sprayed with herbicide. Near the tower it is still very weedy, but better further out.

The 7700 read: 1.872ppm CH4, 27.6RSSI â€“ 72.4 after cleaning
The 7500 read: 388.3ppm CO2, 764mmol/m3 H2O, 98.5SS, 27.4C, 101.2kPA
The struts of both sensors were dirty and there were some spider webs. The 7500 SS rose to 99.9 after cleaning. The 7700 wash box was about 2/3 empty â€“ filled.

The 7550 clock is about 3min behind â€“ I did not adjust it. The 7700s optics RH was 28%. Maybe we should swap it out with the spare in the lab and change its desiccant next time it needs calibration.

Two of the thermocouples were reading Inf.

Miguel took clip plots.

0 photos found

6 sets found

12 TW_met graphs found