Field Notes
<--2001-01-16 00:00:00 | 2001-02-07 00:00:00-->Other sites visited today: Tonzi
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Vaira: 2001-01-30 09:00:00 (DOY 30)
Author: Dennis Baldocchi
Others: Francesca, Kevin
Summary: Zip drive and power inverter missing, could not collect data; swapped Incoming Par sensor; swapped out IRGA with number 75b-0073.
| Jan 30 Weather was clear in the morning, but clouded up later. Solar panel array is ok, 12 v+. Still pulling to amp. Soil temperature is about 8 C. Francesca is accumulating data now on soil respiration with Kevin. They were working in the flux tower footprint. This is an important time for data. But know soils are cold and growth is slow. Soon in Feb. Things should explode. I showed Ted the field systems. We had one glitch. The Zip drive and power inverter was missing from the Blue box, so we were not able to down load data. We swapped out the Incoming Par sensor. We installed 90025. It was giving low values. The new one is giving very good results, eg par albedo of about 7%. The other one was ridiculous, producing PAR lower than Rg and albedos of 33%. We changed the program on the data logger for the calibration, 198.81 micromol m-2 s-1 per mv. The program needs to be downloaded to the computer. Next time we interrogate the CR23x data logger we need to download the program. We swapped out the Irga with number 75b-0073. Another lesson to learn. If we are using a new IRGA that has not been in the field yet, we need to check if the a/d set up is correct. This one had not been adjusted. So in the field we set chan 1 as H2O mmol m-3, and 0 to 5 v range from 0 to 1000 mmol m-3 and channel 2 as CO2 mmol m-3, 0-5 volts from 13 to 20 mmol m-3. This is extremely important as the a/d output needs to know these conversions. We also set the a/d output at 10 Hz Finally, routine is good, good and if you do something out of routine double check your tracks. We had this experience yesterday. Ted noticed Henry's tray for the PC, so we pulled it out to see how it works and put it back. Fine. Then I said lets do one final walk around. Checking the solar panel array we noticed the system was drawing one amp rather than two! Ted asked is this right. We double checked the PC box and found that the plug to the computer had been pulled out. Had we not double checked the pc would have died by days end. So check and double check field systems. |
Field Data
No tank data
No VR Well data found
No TZ Moisture Point data found
No VR Moisture Point data found
No TZ grass heigth found
No VR grass heigth found
No VR Tree DBH found
No water potential data found
No VR Grass Biomass data found
No VR OakLeaves Biomass data found
No VR PineNeedles Biomass data found
0 photos found
9 sets found
16 VR_met graphs found
2 VR_flux graphs found
No data found for VR_soilco2.
No data found for VR_pond.
Can't check TZVR_mixed
No data found for VR_fd.
No data found for VR_processed.
No data found for VR_arable.
No data found for VR_soilvue.