Field Notes

<--2023-09-19 13:10:00 | 2023-10-18 12:30:00-->
Other sites visited today: West Pond | Vaira

Tonzi: 2023-10-04 12:10:00 (DOY 277)
Author: Joe Verfaillie
Others: Daphne

Summary: Swapped mux on Tower top met, updated program, swapped Pt Den batteries - Tree 3 seems to be dying, reset dendrometers on Trees 72 and 79, Zcam 3 needs checking

Tonzi
2023-10-04

Daphne and I arrived at about 12:10 PDT. It was clear hot and sunny but not the oven it can be at this time of year. The ground is very dry. I saw some pock marks in the dust on the road west of the tower so there’s been a little precipitation since the last time a vehicle came through.

Daphne work on the Tower top removing the old AM16/32 mux sn 1237 which has had spike problems. This was one of the sap flow muxes that got worked hard I think. She wired in a new AM16/32B sn 31675. She updated the CR1000 met program to remove the skipped channels and added the reverse Bowen stats to the main table. All seemed well. She also collected the fluxes and phenocam images.
The Tower read: 422.2ppm CO2, 468.3mmol/m3 H2O, 29.0C, 98.9kPa, 100.9SS
The Floor read: 425.2ppm CO2, 450.9mmol/m3 H2O, 33.0C, 99.0kPa, 98.6SS
We cleaned the Floor IRGA.

I did the manual measurements: moisture point, DBH, and wells. I collected the FD data on the Delta laptop. I reset the dendrometers on trees 72 and 79 that were close to maxed out. I swapped the batteries on the point dendrometers – the batteries on Tree 3 were low while the others were still okay. I marked the Tree 3 set of batteries with red x’s to watch them. I also took photos of each of the trees. Mukund pointed out that Tree 3 DBH was behaving differently than all the rest – that tree looks like it is dying.

I serviced the zcams. All seemed well in the field – I manually test each of them. However back in the lab zcam 3 only had images up to 9/23. Something seems to be preventing that camera from taking photos – broken wire?

I had some problems with the well sensor at the Tower well. There is a break in the insulation just above the heat shrink that connects it to the weight. If that part gets wet it will make a connection. I need to seal up that break. Today’s readings seem quite different than last time – need to double check.

We left at about 14:30 PDT

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2023-10-04	WP	2.17
2023-10-04	VR_well	59.25
2023-10-04	VR_pond	13.8
2023-10-04	TZ_road	36
2023-10-04	TZ_tower	31.4
2023-10-04	TZ_floor	36.75

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)
2023-10-04	1	16.6
2023-10-04	102	3.7
2023-10-04	2	15.8
2023-10-04	245	7.6
2023-10-04	3	4.3
2023-10-04	4	6.8
2023-10-04	5	17.7
2023-10-04	6	6.4
2023-10-04	7	13.7
2023-10-04	72	20.8
2023-10-04	72	4.2
2023-10-04	79	20.6
2023-10-04	79	3.7