Field Notes

Sherman Island: 2012-08-30 09:00:00 (DOY 243)
Author: Cove Sturtevant
Others: Sara, Laurie

Summary: Downloaded data, new program fixed problem with slow table on CR1000, new program uploaded to SoilCO2 10X, clipped bare leads on Ref_ST thermocouple wires, did battle with black widow

Sherman
2012-08-30

We arrived about 09:00 PDT. Weather was sunny and a bit breezy, about 75 °F. The water in the ditch by the side of the road was still high and the field under the bridge still flooded, although less than last week. The cows and birds were frolicking in it today. The field site was slightly more brown than last week, still some sprinklings of green.

I checked the tower, swapped the CR1000 card, and downloaded the MET data (onto the notebook used for spectral measurements since Joe had the regular one today). Sara and Laurie did the chamber measurements, moisture point, and water well depth. No spectral or LAI this week. I forgot to download the autocam pics, so we came back on our way home and got them.

LGR readings: 08:16, 25.59 °C, 119.4 Torr, 13.83 us, 10 Hz, 2.0 ppm, ch4_20120823_006.txt
After dueling with a black widow (I won), I adjusted the bypass valve, raising the pressure to 147.0 Torr. Afterward, CH4 read 2.04 ppm.

7500 readings:
CO2: 16.4 mmol m-3
H2O: 680 mmol m-3
T: 23.7 °C
P: 100.9 kPa
Diag: 248

The 10 Hz winds and concentration fluctuations looked good, and MET looked good except for a potential issue with SHF_1. The values seemed to vary too much, also fluctuating between positive and negative, so we should check the recently downloaded data for a potential issue with this sensor.

I sent a new program (CR1kFlux_v20120827.CR1) to the CR1000 to fix the Slow data table problem (the li_co2 was outputting -99999 instead of NaNs for bad points, which mucked up the flags for calculating the 7500 half-hour average without them). The new program was effective, and half-hourly averages after the upload looked good.

I also sent a new program (CR10X3_SoilCO2_EXPV7.dld) to the CR10X reading the Soil CO2 sensors, in which Joe had rejigged the output a bit.

Next I addressed the issue with the Ref_ST3 on the 10X. After theta probes were installed on 2 August, the temperature fluctuation of this channel reduced markedly. I looked in the box housing the multiplexor and noted that the bare ends of the thermocouple wires extended out of the mux inputs a bit too much, and looked as if they could have been touching each other or other ground wires. I shortened the bare length of the thermocouple wires for all three Ref_ST thermocouples and reinstalled them. Ref_ST numbers looked good afterward, although it was hard to tell if it fixed the problem. We shall see.

0 photos found

7 sets found

No data found for SI_mp.
11 SI_met graphs found