Field Notes

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Other sites visited today: Tonzi | Hill Slough
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Vaira: 2021-12-02 09:00:00 (DOY 336)
Author: Joe Verfaillie
Others:

Summary: reinstalled another FD chamber, swapped 7500 for calibration, spectra measurements failed, turned on cow fence.

Vaira
2021-12-02

I arrived at about 9:00 PST. The Delta was all in heavy fog. Here it was sunny and mild with little to no breeze. The grass is 5cm to 15cm tall - longer under the trees. The ground is still moist mostly from overnight dew. The puddles on the road have dried up and the water hole is a little less than completely full. The tress still have a lot of green leaves here.

I installed another FD chamber sn FD20180047 to replace the one I removed last time at the west profile. The old location had become kind of a hole with almost no litter left. I chose a new location about 10cm away, pulled the green grass and installed the chamber. I think we should move these chambers each dry season to a new location. We need to balance the disturbance and change in location with the effects caused by leaving the chamber protecting/shielding the same bit of soil years on end.

I swapped the 7500 for calibration: sn 0042 came off and sn 75H-2182 went on.
0042 read: 432.6ppm CO2, 382.7mmol/m3 H2O, 100.1kPa, 17.2C, 103.4SS
2182 read: 440.2ppm CO2, 380.4mmol/m3 H2O, 100.1kPa, 17.6C, 100.4SS
I updated the pressure coefficients and reset the box.

I measured the well depth and collected the met, flux, FD data and camera.

I did spectra measurements but was not real happy with them. The reflectance plot on the JAZ seemed to be off scale on the high end. I need to look at the data to see if it was just a plotting issue. Yep, all the spectra are off scale starting at about 750-850nm.

I did not go to the pond.

I turned on the electric fence. The cows seem to be beating a path around the outside of the fence. Last time I though the fence charger sounded funny but it seemed okay this time and was creating an energetic arc when I held the line to a fence post. The needle is stuck in the middle of the dial but otherwise it seems okay.

I left at about 10am

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2021-12-02	VR_well	57.6
2021-12-02	TZ_floor	32.15
2021-12-02	TZ_road	39.75
2021-12-02	TZ_tower	36.15
2021-12-02	HS	6.38

mode = both
Moisture Point Probes TZ
Array ( [0] => Tower_1 [1] => Soil_Transect_4_1 [2] => Soil_Transect_3_1 [3] => Soil_Transect_2_1 [4] => Soil_Transect_1_1 [5] => SoilCO2_West_A_1 [6] => SoilCO2_West_B_1 [7] => SoilCO2_West_C_1 [8] => Tower_2 [9] => Soil_Transect_4_2 [10] => Soil_Transect_3_2 [11] => Soil_Transect_2_2 [12] => Soil_Transect_1_2 [13] => SoilCO2_West_A_2 [14] => SoilCO2_West_B_2 [15] => SoilCO2_West_C_2 [16] => Tower_3 [17] => Soil_Transect_4_3 [18] => Soil_Transect_3_3 [19] => Soil_Transect_2_3 [20] => Soil_Transect_1_3 [21] => SoilCO2_West_A_3 [22] => SoilCO2_West_B_3 [23] => SoilCO2_West_C_3 [24] => Tower_4 [25] => Soil_Transect_4_4 [26] => Soil_Transect_3_4 [27] => Soil_Transect_2_4 [28] => Soil_Transect_1_4 [29] => SoilCO2_West_A_4 [30] => SoilCO2_West_B_4 [31] => SoilCO2_West_C_4 )

0000

Date	DOY	Rep	Depth	Tower_1	Soil_Transect_4_1	Soil_Transect_3_1	Soil_Transect_2_1	Soil_Transect_1_1	SoilCO2_West_A_1	SoilCO2_West_B_1	SoilCO2_West_C_1	Tower_2	Soil_Transect_4_2	Soil_Transect_3_2	Soil_Transect_2_2	Soil_Transect_1_2	SoilCO2_West_A_2	SoilCO2_West_B_2	SoilCO2_West_C_2	Tower_3	Soil_Transect_4_3	Soil_Transect_3_3	Soil_Transect_2_3	Soil_Transect_1_3	SoilCO2_West_A_3	SoilCO2_West_B_3	SoilCO2_West_C_3	Tower_4	Soil_Transect_4_4	Soil_Transect_3_4	Soil_Transect_2_4	Soil_Transect_1_4	SoilCO2_West_A_4	SoilCO2_West_B_4	SoilCO2_West_C_4	Spacial Count
2021-12-02	336	0	nan	28.8	11.8	19.4	21.2	14.7	24.7	26.1	19.4	30.4	23.7	30.4	29.5	14.5	32.3	17.9	27.7	31.3	23.5	29.9	32.1	29.9	39.9	33.2	34.9	40.8	29.7	40	48	30.9	37.7	48	48
2021-12-02	336	1	nan	29.1	11.8	15	20.9	14.7	25.6	26.4	19.7	30.1	21.3	30.1	28.9	14.8	31	18.2	28	30.4	22.6	29.9	31.5	29.6	39.6	33.8	34.9	41.1	29.1	40	47.7	30.2	39.7	47.7	48.6
2021-12-02	336	Avg	0-15cm																																	0
2021-12-02	336	Avg	15-30cm																																	0
2021-12-02	336	Avg	30-45cm																																	0
2021-12-02	336	Avg	45-60cm																																	0