Field Notes

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Other sites visited today: Vaira

Tonzi: 2024-03-26 12:35:00 (DOY 86)
Author: Joe Verfaillie
Others:

Summary: Helped Troy troubleshoot trailer - pushed a button, swapped 7500s for calibration, read TOMST ptden, added new TOMST on small pine, removed old HMP45 at Floor met, Cows disturbed Tree1 FD and OSU net.

Tonzi
2024-03-26

I arrived at about 12:35 PDT. It was mostly clear, sunny and cool with some white fluffy clouds floating past. The trees are starting to put on leaves and there is a scattering of wild flowers. There are still puddles on the road with more rain to come. There are lots of hoof prints and a broken fence at soil co2 but I didn’t see any cows. There were tadpoles in the big puddles in the road.

I started on the soil moisture, DBH, wells and zcams, while I waited to hear from Troy about troubleshooting their trailer. Troy called and said he had no connection to the trailer system. Seemed the Verizon hotspot was off. Restarting the hotspot gave him access. Later I restarted the big spectrometer for him which he could have done remotely but was easier for me to do manually. Afterwards the camera was busy pointing at things.

At the Floor I swapped the 7500 for calibration: sn 75H-2667 came off and sn 75H-2176 went on. I entered the pressure coefficients and restarted the box. Back in the lab I found about five 30min ghg files that were corrupted just after our last visit. 7zip was able to recover most of one file but the others were just full of null values.
2667 read: 427.1ppm CO2, 452.0mmol/m3 H2O, 16.7C, 99.5kPa, 98.4SS
2176 read: 423.2ppm CO2, 516.3mmol/m3 H2O, 17.2C, 99.7kPa, 101.5SS

At the Tower I swapped the 7500 for calibration: sn 75H-2669 came off and sn 0073 went on. I entered the pressure coefficients and restarted the box.
2669 read: 422.5ppm CO2, 465.2mmol/m3 H2O, 15.6C, 99.4kPa, 99.5SS
0073 read: 424.2ppm CO2, 464.5mmol/m3 H2O, 15.1C, 99.4kPa, 103.4SS

I forgot to clean the phenocam window so I climbed the tower a second time to clean the window.

I read all the TOMST point dendrometers I installed last time. The values looked okay but I’ll need to look at them more closely in the lab. I installed another TOMST dendrometer sn 92243047 on the small pine next to cluster 1 oak (aka 133). This dendrometer is at breast height just below the first set of branches. The tree circumference is 63.2cm. This tree doesn’t have an id because it has grown after they tagged all the surrounding trees. Maybe we should name it.

I removed the old HMP45 sn W0510026 from the Floor met system and updated the met program to remove the measurements and two columns from the met table. I had to cut the cable to get it out of the box, but I don’t think we will use this sensor again. The new Hygrovue is running.

I fixed the soil CO2 cow fence. They had knocked over the Tree1 FD chamber and slightly tilted the net radiometer to the north. I fixed these too. The newish battery I had put on the cow fence a few weeks ago was reading 5.4V. The solar panel said 19V as an open circuit but connected to the battery – 5.4V. Might be dead.

Zcam1 and Zcam3 have dead clock batteries. I knew about Zcam1 but now I can swap both next time.

I left at about 16:20 PDT.

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2024-03-26	VR_well	53.2
2024-03-26	VR_pond	21.5
2024-03-26	TZ_floor	21.6
2024-03-26	TZ_road	29.95
2024-03-26	TZ_tower	25

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)
2024-03-26	102	5.8
2024-03-26	2	16.3
2024-03-26	245	10.2
2024-03-26	3	7.7
2024-03-26	4	9.8
2024-03-26	5	18.6
2024-03-26	6	8.2
2024-03-26	7	15.8
2024-03-26	72	7.4
2024-03-26	79	7.5