Field Notes

<--2020-07-28 10:00:00 | 2020-09-16 13:30:00-->
Other sites visited today: Tonzi | Tonzi | Bouldin Alfalfa

Vaira: 2020-08-26 11:30:00 (DOY 239)
Author: Joe Verfaillie
Others: Siyan

Summary: Very dry, trees turning brown, some thunder storms a week ago, swapped calibration PAR sensors, swapped the 7500

Vaira
2020-08-26

I arrived at about 11:30. Siyan was here earlier in the morning. Many of the trees have turned brown. The trees here arenâ€™t as extensively brown as at Tonzi but still a big change for this early in the season. The water hole by the road was dry. There was a little recent rain from some thunderstorms but only enough to pockmark the dust and get the sensors dirty. Today was kind of hazy but I didnâ€™t smell any smoke in the air.

I swapped the 7500: sn 75H-2669 came off and sn 75H-2176 went on.
2669: 394.8ppm CO2, 663.2mmol/m3 H2O, 99.0kPa, 34.8C, 96.2SS â€“ before cleaning
2669: 417.9ppm CO2, 524.5mmol/m3 H2O, 99.0kPa, 35.0C, 101.8SS â€“ after cleaning
2176: 416.5ppm CO2, 511.8mmol/m3 H2O, 98.9kPa, 35.5C, 101.6SS

I collected the met, flux, Phenocam images and FD chamber clearing its memory. All seemed well.

I swapped the PAR sensors I had been inter-comparing. One of them was the Ameriflux standard that needed to be returned to the lab. Sn 161073 was removed from the incoming position and sn 140455 was removed from the reflected position. Sn 040412 was installed in the incoming position and sn 030381 was installed in the reflected position.

I went to the pond and collected the water level data. The pond level was 14.56ft. There were a couple of cows on the far side of the pond.

There was a four wheeler parked under a tree near the entrance that I didnâ€™t notice on my way in but it could easily have been there all along â€“ I didnâ€™t see anyone around.

I left at about 1pm

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2020-08-26	VR_well	58
2020-08-26	TZ_floor	29.8
2020-08-26	TZ_tower	34.3
2020-08-26	TZ_road	37.8
2020-08-26	VR_pond	14.56

mode = both
Moisture Point Probes TZ
Array ( [0] => Tower [1] => Floor_South [2] => Floor_West [3] => Soil_Transect_4 [4] => Soil_Transect_3 [5] => Soil_Transect_2 [6] => Soil_Transect_1 [7] => SoilCO2_West_A [8] => SoilCO2_West_B [9] => SoilCO2_West_C )

Date	DOY	Rep	Depth	Tower	Floor_South	Floor_West	Soil_Transect_4	Soil_Transect_3	Soil_Transect_2	Soil_Transect_1	SoilCO2_West_A	SoilCO2_West_B	SoilCO2_West_C	Avg	Spacial Count	Measurement Count
2020-08-26	239	0	0-15cm	3.6	9.5	4.7	1.9	0.3	3	0.3	8.6	2.7	2.1
2020-08-26	239	0	15-30cm	10.9	8.1	4.2	6	13.3	1.8	4.2	6.9	2.7	11.8
2020-08-26	239	0	30-45cm	13.7	10.6		10.6	12	15.9	13.7	15.4	15.4	11.5
2020-08-26	239	0	45-60cm	18.8	2.7		11	17	27.1	13.3	16.2	22.5	17.3
2020-08-26	239	1	0-15cm	3.3	2.2	5	2.2	0.6	3.3	0.6	8.8	3.6	2.4
2020-08-26	239	1	15-30cm	10.9	8.4	6.3	6	13.3	11.6	4.5	6	0.8	11.5
2020-08-26	239	1	30-45cm	13.4	13.7		9.5	12.9	15.9	13.1	15.9	14.3	11.5
2020-08-26	239	1	45-60cm	16.8	2.4		11	17.3	26.8	13	16.2	23.1	16.8
2020-08-26	239	Avg	0-15cm	3.45	5.85	4.85	2.05	0.45	3.15	0.45	8.7	3.15	2.25	3.44	10	20
2020-08-26	239	Avg	15-30cm	10.9	8.25	5.25	6	13.3	6.7	4.35	6.45	1.75	11.65	7.46	10	20
2020-08-26	239	Avg	30-45cm	13.55	12.15		10.05	12.45	15.9	13.4	15.65	14.85	11.5	13.28	9	18
2020-08-26	239	Avg	45-60cm	17.8	2.55		11	17.15	26.95	13.15	16.2	22.8	17.05	16.07	9	18

mode = both
Moisture Point Probes VR
Array ( [0] => Flux_Tower [1] => Biomass_Cage )

Date	DOY	Rep	Depth	Flux_Tower	Biomass_Cage	Avg	Spacial Count	Measurement Count
2020-08-26	239	0	0-15cm	0.4	0.1
2020-08-26	239	0	15-30cm	7.5	3.9
2020-08-26	239	0	30-45cm	4.5	14
2020-08-26	239	0	45-60cm	14.5	17
2020-08-26	239	1	0-15cm	0.4	0.4
2020-08-26	239	1	15-30cm	7.5	3.5
2020-08-26	239	1	30-45cm	3.9	13.7
2020-08-26	239	1	45-60cm	13.6	17.3
2020-08-26	239	Avg	0-15cm	0.4	0.25	0.33	2	4
2020-08-26	239	Avg	15-30cm	7.5	3.7	5.6	2	4
2020-08-26	239	Avg	30-45cm	4.2	13.85	9.03	2	4
2020-08-26	239	Avg	45-60cm	14.05	17.15	15.6	2	4