Field Notes

<--2022-09-14 12:40:00 | 2022-10-20 11:45:00-->
Other sites visited today: Hill Slough | Vaira

Tonzi: 2022-10-05 10:50:00 (DOY 278)
Author: Joe Verfaillie
Others:

Summary: Updated OSU CR3000, standard data collection, 7500 418 seems stable, removed most of old soil CO2 system, Checked PARout and LWin.

Tonzi
2022-10-05

I arrived at 10:50 PDT. It was clear, sunny, hot and dry with a little breeze from the west. The trees have lost most of their brown leaves so there is only a scattering of green leaves left. I met Rob on the way out and had to renegotiate the land use agreement which expires this month. We will pay 00 per year going forward. I forgot my todo list at home so had to muddle through.

I updated the OSU CR3000 program to move the current excitation box from C3 to C4 and disconnected the unused NR01 heater control. Then I wired the soil water potential to C3 (SDI-12). It wasn’t working when it was sharing C7 with the SoilVue sensor. It responded on C3 but when I updated the program I also noticed that the SDI-12 command was issuing a 6M1! command instead of 6M! So it might have been fine on C7 with this fix. I also checked on the ECHO soil moisture probes that have errors. Both were wired okay. VWC2 has a NaN every once in a while that is corrupting the 30min average. VWC5 is just zero. Could be bad mux channels. More testing needed.

I collected flux, met, camera, well and FD data. I serviced the zcams. I measured the wells, DBH and soil moisture. The well level sensor was acting flaky on the Floor and Road wells. I cleaned the pin and slot with the file on my Leatherman and it seemed to work better at the Tower well.

We are keeping an eye on IRGA 418 on the Floor tower. Its SS had drifted more than usual after return from Licor. Today it as 98 – a little higher than in the lab but I think the other IRGAs were higher too.

TT read: 416.6ppm CO2, 587.8mmol/m3 H2O, 27.0C, 99.1kPa, 100.0SS
TF read: 424.7ppm CO2, 533.6mmol/m3 H2O, 29.1C, 99.2kPa, 98.0SS

I removed much of the old soil co2 system. I left the boxes and a bunch of wire running between the boxes and power under the tree from the FD chamber. I also left the tubes in the soil just in case. I removed two relays, a DC-DC converter, eight transmitter boxes and:
CR23X sn 2301
CO2 probes
Tree -2 sn L2010069
Tree -4 sn G0150035
Tree -8 sn G0150036
Tree -16 sn Y2009100
Open -2 sn K1310104
Open -4 sn Z2720015
Open -8 sn K1340006
Open -16 sn K1310102

I checked on the wiring for PAR_out and LW_in at the Tower – these two channels have had random spikes. I think a screw terminal on LW_in tightened up a little bit and I moved the two PAR sensors further down the multiplexor.

I left at about 14:30 PDT

Checking the data in the lab - all the images from zcam 1 have been black since last field visit on 9/14.

Field Data

No tank data

No TZ 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 TZ Tree DBH found

No water potential data found

No TZ Grass Biomass data found

No TZ OakLeaves Biomass data found

No TZ PineNeedles Biomass data found