Field Notes

When: Nov 5, 2002, D309
Who: D Baldocchi and M Falk
Where: Vaira/Tonzi

Arrived 09:30 at Vaira ranch. Mild day, light winds, high cirrus. The rangeland is very dry and rain is expected in two days. No cows are present.

Flux system was operating aok. All signals in range. Due to the dry nature of the ecosystem little structure in q and c turbulence

W: -.5
U: 2.8
V: -0.84
T: 17.2
Q: 1.01
C: 1.76

Clock was about 7 minutes fast. Reset the clock at 1000 to my pocket watch. Set to about the right time and NPR. Need to double check time with GPS next time. Forgot to reset CRxs. They should re-set with PC208 at end of the day.

Forgot to bring T/RH calib standard and check instruments.

Checked Campbell data loggers. They communicate with the system and data are in range.

Solar system
Batt volt: 13.1 v
Gen: 8.6 amp
Load: 2.6 amp
Cleaned solar panel Then Gen: 17.8 amp. Cleaning did help, but sun was dancing behind clouds.

10:32 Swapped irgas. sn 0042 came down and sn 0418 went up, the new one. The one out in the field was clean. Bird crap was on the sonic transducer and I cleaned it.

Washed off dust on pyranometer with squirt bottle, but could not reach Rnet and PAR. We need ladder at the site for better radiometer maintenance. Before cleaning Rg it read 598 W m-2. After washing it read 610 W m-2. So there may have been a 10 Wm-2 bias.

Check Rg vs Par for data before and after washing! And Rain to come.

Downloaded data, raw, met and flux. Moved data to sub. We need to check storage and soon remove raw data from 2000 and 2001 to save space and be ready for 2003.

Read Moisture Point Sensors

11:30 off to Tonzi ranch

1. found PC not operating
2. Voltage at panel was 14 v
3. downloaded data from the forest floor system
4. reset clocks to gps of Matthias (12:17). System was 3 minutes fast
5. reset clocks on data loggers
6. 1.0 Gig free on the pc
7. Checked CRx data loggers. All looked good
8. Swapped irgas. sn 0065 came off and sn 0073 went on
9. Checked solar panel system
10. Batt voltage 13.4; Generating 4.1 amp; load 11.8 amp. Batteries were filled up since the system was down and not pulling juice. Found that gen amps jumped to 8.1 amps if I took off the sensor wire. System is in full sun and orthogonal to sun at midday. By late afternoon, system in shade of trees and generating about 1 amp
11. rebooted computer

Flux system

W: 0.64
U: -.46
v.91
T 27.1
Q 1.03
C: 1.64

All data on scale.

13:24 Checking Tower system. Rebooted and set clock to gps. It was 4 minutes fast. Down loaded data. sn 0041 came down and sn 0035 went up

We need new screws for mounting the licor head to its mount. One dropped and I had to cannibalize the floor system

14:00 Lots of smoke in the area. Check signals.

Downloaded soil moisture points systems and read dendrometers