Field Notes

<--2025-02-07 11:10:00 |
Other sites visited today: Vaira
Phenocam link: Searching...

Tonzi: 2025-02-21 10:50:00 (DOY 52)
Author: Joe Verfaillie
Others: Kuno

Summary: Phenocam images went missing, Replaced North T3 TC on tree stem temps, Removed Tree1 FD due to bad CO2 reading replaced with open FD, IRT tilted, zcam1 tilted, Tower fence fixed.

Tonzi
2025-02-21

Kuno and I arrived at 10:50 PST. It was clear sunny and mild with a light breeze. The pond has doubled in size since the last visit. There was a little more rain, but I guess the ground is finally saturated and it mostly runs off now. Still I have seen the pond fuller. The grass is green, the trees are still dormant.

I collected the tower top flux data, but the phenocam had not written any files. I didn't see a card error, but the green eject light didn't come on when I pushed the button. The Ethernet was working though. I unpowered the CR1000, removed the card/Ethernet interface and found a bit of corrosion on the pins. I scrapped both sides with a screw driver, reseated the interface and made sure the camera files were saved and the Ethernet worked. Maybe need to think harder about connecting the camera to the internet. The wash reservoir was almost full - topped off.
The 7500 read: 434.7ppm, 414.4mmol/m3, 15.4C, 99.6kPa, 100.4SS
The 7700 read: 2.09ppm, 68.1RSSI - 83.8 after cleaning

At the Floor tower Kuno did his usual rounds of stem and soil fluxes - he saw much larger releases of CO2 and CH4 than before. He also added five soil collars inside the Soil CO2 fence. I think he saw CH4 uptake there. The Floor tower seemed to be running fine. I collected the flux, well data, tree stem temps and serviced zcam 3. I swapped TC3 on the north tree stem temp system - the original one was intermittently bad. I unwired the old TC but didn't totally removed it so its ends are hanging loose.
The 7500 read: 430.9ppm,444.0mmol/m3, 18.1C, 99.8kPa, 103.0SS
The 7700 read: 2.07ppm, 69.5RSSI - 79.8 after cleaning
The wash reservoir was nearly full - topped off. The optics RH was 16%.

I did the manual soil moisture, well and dendrometer readings. I serviced the other two zcams. Zcam1 had been tilted and its box was cracked. I had to pry the box back in place but the crack closed up pretty well. Maybe some lower gap fraction numbers but trees haven't changed recently - easy to gap fill.

The FD chamber under the tree was reading random CO2 values. I removed that chamber sn FD20200001 and moved the open FD chamber sn FD20190027 to the under tree location. The open FD chamber usually matches the two at Vaira pretty well but the under tree one does its own thing.

Cows had tilted the ground IRT again - I twisted it back in place.

The fence charger on the Tower fence was not working due to rotted leads on the battery. I fixed the leads then Kuno and I untangled fence wires and it seemed to be working well again.

On the way out we stopped at the pond to do floating chamber fluxes just for fun.

We left at about 14:20 PST

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2025-02-21	TZ_floor	27.05
2025-02-21	TZ_road	34.7
2025-02-21	TZ_tower	31
2025-02-21	VR_well	55.4
2025-02-21	VR_pond	22.08

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)
2025-02-21	1	14.7
2025-02-21	102	9.3
2025-02-21	2	17.9
2025-02-21	245	13.5
2025-02-21	3	11.4
2025-02-21	4	14.1
2025-02-21	5	6.3
2025-02-21	6	10.3
2025-02-21	7	17.6
2025-02-21	72	7.3
2025-02-21	79	11.9