Field Notes
<--2013-05-24 09:00:00 | 2013-06-13 12:15:00-->Other sites visited today: Twitchell Alfalfa | DWR Corn | West Pond | Sherman Island | Mayberry
Twitchell Rice: 2013-06-05 09:45:00 (DOY 156)
Author: Cove Sturtevant
Others: Sara, Laurie, Yanel
Summary: Rice growing fast. Updateed 7550 firmware. Leveled pyranometer. Installed DO sensor. All generally well.
| We arrived about 09:45 PDT. It was cool and windy, with a bit of haze on the horizon but overall clear. The rice is growing fast. Laurie did LAI with Iryna who was already at the site with her crew. Wyatt and Suzie also showed up a bit later. Sara did spectral with Yanel, her new field assistant who is very cool. I attended to the tower and updated the 7550 (s/n AIU-0650 with 7500 head 0065) firmware to version 6.5.2 and FPGA version 6.0.3. I downloaded the flux data first but left the data on the USB stick and reinstalled it afterward. All calibration coefficients and settings were retained after the update. The exceptions to this were the zero/span CX coefficient (changed from 3200 to 45875) and the signal strength coefficients B and C (B changed from 2.691 to 1.6, C changed from 4.178 to 3.2). I called LI-COR to make sure that this was okay. The technician reported that changes to these coefficients should be expected upon firmware update and not to worry unless the readings looked funky. Readings looked good, matching the values prior to the update. In addition, these coefficients were changed to the new values at all the other sites where I updated the firmware. I checked the current pressure coefficients of the 7550 box against the factory cal, exact match. There is now a label inside the 7550 box with the pressure coefficients. 7500 readings: CO2 = 389 ppm (400 after cleaning, same after firmware update) H2O = 580 mmol m-3 (570 after cleaning, same after firmware update) agc = 3.8 (0.0 after cleaning, signal strength = 77.8 after firmware update) t = 17.37 C p = 101.93 kPa sos = 344.7 m s-1 7700 readings: CH4 = 1.9 ppm RSSI = 17.2 (bumped to 60 after cleaning) The reservoir was almost full, refilled to 100%. MET looked good. I re-leveled the pyranometer, which was tilted a bit toward the south. I installed the DO sensor that we attempted last time. Readings went from about 29 in air to 0.7 in the water. These seemed a bit low, but we decided to let it settle out and check next week. Cleaned solar panels. |
4 photos found
TW_autocam_20130605_0915.jpg ( 2013-06-05 09:15:02 ) Full size: 1920x1440
Fieldwork
TW_autocam_20130604_1215.jpg ( 2013-06-04 12:15:02 ) Full size: 1920x1440
Egrets
TW_autocam_20130606_1815.jpg ( 2013-06-06 18:15:02 ) Full size: 1920x1440
Ibis
TW_autocam_20130604_1115.jpg ( 2013-06-04 11:15:03 ) Full size: 1920x1440
Egrets
6 sets found
12 TW_met graphs found
5 TW_flux graphs found
Can't check TWSI_mixed
Can't check SIMBTWEE_met
1 TW_cam graphs found
Can't check TATWBABCSB_cam