Field Notes

Twitchell Rice: 2009-04-03 09:00:00 (DOY 93)
Author: Dennis Baldocchi
Others: Joe, Matteo, Rodrigo

Twitchell Island Rice Study Set up April 3, 2009 Bare Peat field, leveled for Rice Latitude: 38o 06.520� Longitude: 121o 39.180 Elevation: -14 m Team: Baldocchi, Verfaillie, Detto, Vargas Set up CO2, water vapor and energy flux system on tripod. The system is being powered by 6 solar panels. The system is drawing about 2.2 amps. The system is being logged with a CR 1000 datalogger. We are going into the modern mode sampling and logging digital output from the sonic and LI 7500 through the CR 1000. A small pc queries the system and stores data. Met data are tied to a CR 23x and multiplexors. We are performing a side by side comparison with Frank Anderson of USGS Instrumentation Sensor/model Serial number calibration Sonic anemometer/ Gill model 1352 sn 000024 Temperature/RH, Vaisala HMP 45ac sn U3030046 Kipp Zonen pyranometer, CM 11 sn 996985 4.90 microV/(W m-2) PAR KippZonen sn 050596 5.25 micromol m-2 s-1/‌ PAR KippZonen sn 050597 5.35 micromol m-2 s-1/‌ Kipp Zonen, Rnet Lite sn 990352 14.2 microV/(W m-2) Soil heat flux, Huseflux, HFP-01 sn 002211 66.1 micrV/(W m-2) Soil heat flux, Huseflux, HFP-01-SC sn 00243 62.1 micrV/(W m-2) Soil heat flux, Huseflux, HFP-01-SC sn 00246 61.2 micrV/(W m-2) Soil heat flux, Huseflux, HFP-01-SC sn 00244 61.5 micrV/(W m-2) Wetness, Campbell Pn 9661 Soil moisture, theta probe ML 2x sn 139/052 Field calib Soil moisture, theta probe ML 2x sn 54/001 Field calib Position/placement: Sensor/model Serial number Ht/Depth Sonic anemometer/ Gill model 1352 24 Z= 3.05 m at middle of path LI -7500 Z= 2.59 m middle of path; temporary, need formal mount; x= 0.30 m from sonic Temperature/RH, Vaisala HMP 45ac U3030046 Kipp Zonen pyranometer, CM 11 996985 PAR KippZonen 050596 Pointing down PAR KippZonen 050597 Pointing Up Kipp Zonen, Rnet Lite 990352 Z=2.34 m; X=3.71 m Soil heat flux, Huseflux, HFP-01 002211 -1 cm Soil heat flux, Huseflux, HFP-01-SC 00243 -1 cm Soil heat flux, Huseflux, HFP-01-SC 00246 - 1cm Soil heat flux, Huseflux, HFP-01-SC 00244 -1cm Wetness, Campbell Pn 9661 Soil moisture, theta probe ML 2x 139/052 surface Soil moisture, theta probe ML 2x 54/001 surface Soil temperature 2,4,8,16,32 cm Soil probes (temperature, heat flux plate and soil moisture) were placed near the base of the tower, which is at the eastern edge of the rice paddy. We will move the soil probes into the rice field once the field work is complete. To do: properly orient sonic anemometer. It is approximately North. Anchor net radiometer boom so it does not rotate along axis from wind. Power aspirator on T-RH sensors Add pressure sensor, rain guage and water table guage Move soil probes when the rice is planted. Add web cam Move PC to trailer and connect to system with radio modem Install LGR methane sensor..need more solar panels and batteries; use 4 stage pump and sample at 1 Hz ‌‌‌ can we install a small low power A/C to keep the pump and LGR at a reasonable temperature during the summer (Tair > 40 C)�alternating power may not be a reality..

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