Field Notes

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Other sites visited today: Bouldin Alfalfa | Vaira | West Pond
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Tonzi: 2023-09-19 13:10:00 (DOY 262)
Author: Joe Verfaillie
Others:

Summary: Standard data collection, midday water potential, checked and collected the point dendrometer data, swapped 7500s for calibration

Tonzi
2023-09-19

I arrive at about 13:10 PDT. Running a little late today because of a stop in the Delta. It is clear, sunny and mild with a nice breeze from the west. The Bay Area had heavy smoke from fires to the north this afternoon but no hint of smoke here. There is maybe a little yellowing on some of the trees.

I did leaf water potential first to catch solar noon. Not much change from last time.

I swapped IRGAs for calibration. At the Tower sn 0042 came off and sn 75H-2180 went on. At the Floor sn 0073 came off and sn 0041 went on.
Tower 0042 read: 414.3ppm CO2, 609.1mmol/m3 H2O, 25.4C, 98.7kPa, 104.4SS
Tower 2180 read: 412.3ppm CO2, 589.1mmol/m3 H2O, 25.5C, 98.7kPa, 102.7SS
Floor 0073 read: 415.9ppm CO2, 599.6mmol/m3 H2O, 28.6C, 98.8kPa, 103.9SS
Floor 0041 read: 418.2ppm CO2, 611.8mmol/m3 H2O, 28.4C, 98.8kPa, 99.0SS
I updated the pressure coefficients, adjusted the clocks to match the laptop and reset the 7550 boxes.

I did the manual well measurements, moisture point measurements, collected the FD chamber data, read the DBH bands, serviced the z-cams and collected the Road well data. All seemed well.

I collected all the met data from the Tower computer. Even the IRT CR1000 was up to date there.

I collected data from the point dendrometers. I glanced quickly at the data to see if the batteries were low or if the readings looked bad. All seemed well.

I left at about 15:45 PDT

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2023-09-19	VR_well	58.75
2023-09-19	TZ_floor	25.9
2023-09-19	TZ_road	28.25
2023-09-19	TZ_tower	30.55

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)
2023-09-19	1	16.6
2023-09-19	102	3.8
2023-09-19	2	16.9
2023-09-19	245	7.6
2023-09-19	3	4.3
2023-09-19	4	6.9
2023-09-19	5	17.8
2023-09-19	6	6.4
2023-09-19	7	13.7
2023-09-19	72	21.0
2023-09-19	79	19.5