Field Notes

<--2013-03-13 09:00:00 | 2013-03-27 10:00:00-->
Other sites visited today: Vaira | Tonzi

Tonzi: 2013-03-13 10:00:00 (DOY 72)
Author: Joe Verfaillie
Others: Siyan

Summary: Standard fieldwork, added AM16/32 to tower 23x box, swapped co2 profile filter near IRGA, tried tram but wheels too narrow, upgraded tower computer to Loggernet, things look dry for this time of year.

Tonzi
2013-03-13

I arrived about 10am PDT with Siyan. It was clear, sunny and warm with little to no wind. There was patchy fog in the Delta and Central Valley on the way up. The grass in the entire area looks dry and over grazed. The low spot in the road near the tower still has some standing water.

I found a couple trees near the soil CO2 fence that still have a sprinkling of mature, healthy looking leaves that apparently were not lost in the fall.

I put the tram back on the track, but when it started to run the drive wheels were too narrow in a few spots. I brought it back in for another try. It would also be good to get the weight off the motors and on some bearings instead.

The CO2 profile system seemed to be running okay. However, I swapped out the plastic filter in the box with a stainless steel 2um filter. We will see if this keeps the IRGA cleaner.

I added an AM16/32 (sn 1237) to the tower CR23X box in preparation for adding the new diffuse PAR and 4-band radiometers next time.

I cleaned the radiometers but they were pretty clean to begin with.

The hmp45 fan at the tower top was not running.

I connected a serial line to the Tower CR1000. However, the old PC208W cannot talk to CR1000s so I setup Loggernet to talk to the CR1000 and the Tram and then CO2 Profile data loggers. I also had to change the daily rename MD9 programs that were set up as tasks in PC208W. These now run as daily rename batch files from the Windows Task Manager. The CR1000 data is not being transferred to the computer. I swapped the card on the CR1000.

The D drive on the computer is running out of space again. It was down to about 500MB. I need to move off some old data again – there’s data back to 2008 on the drive.

I cleaned the windows on the z-cams.

I removed the card from the Floor CR1000 and uploaded a new program. The new program is driven by the sonic timing but does a better job writing the 30min data. After the new program was running I inserted in a new card.

The tram has five 10ft sections. I think we should be able to break it into two pieces to move it. The junctions between the 10ft sections are a little sloppy and could be redone. There are screw in tie downs under each tripod. I could build a better stand for the solar panels and batteries. The panels are BP US20X and about 16x20 inches.

I pulled two fences posts near the water potential table relatively easily by hand, so the ground is still pretty soft.

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2013-03-13	TZ_floor	26.3
2013-03-13	TZ_road	36.6
2013-03-13	TZ_tower	31.6

No TZ Moisture Point data found

No VR Moisture Point data found

No TZ grass heigth found

No VR grass heigth found

Tree DBH

Date	Tag#	Reading (mm)
2013-03-13	1	24.1
2013-03-13	102	16
2013-03-13	2	18.1
2013-03-13	245	12
2013-03-13	3	20.5
2013-03-13	4	4.5
2013-03-13	5	24.1
2013-03-13	7	17.5
2013-03-13	72	14
2013-03-13	79	14.2
2013-03-13	8	8.8