Site: Vaira (VR) aka US-Var
2000-10-22 - Present
Located in the lower foothills of the Sierra Nevada Mountains on privately owned land, the Vaira Ranch site is classified as a grassland dominated by C3 annual grasses. Managed by local rancher, Fran Vaira, brush has been periodically removed for cattle grazing. Species include a variety of grasses and herbs, including purple false brome, smooth cat's ear, and rose clover. Growing season is confined to the wet season only, typically from October to early May.
Last field site visit: more fieldnotes
| 2024-11-15 16:30:00 | Arrived at about sunset, installed west FD chamber, went to the pond, some new grass deep in the litter, compost amendment in northwest corner of the property. |
Latest data processing: more processing notes
| 2024-11-18 | L1-L3 processing 2024 second trimester for dates: 2024-04-09 - 2024-09-28 |
| Processor of record: 2008-01-31 - Siyan Ma 2019-01-16 - Joe Verfaillie 2019-04-23 - Siyan Ma 2022-09-04 - Joe Verfaillie |
Ameriflux Author:
20001001 - Dennis Baldocchi 20010200 - Liukang Xu 20050307 - Siyan Ma 20080800 - Joseph Verfaillie |
Data Digital Object Identifier (DOI)
AmeriFlux: https://doi.org/10.17190/AMF/1245984
FLUXNET: https://doi.org/10.17190/AMF/1993904
FLUXNET2015: https://doi.org/10.18140/FLX/1440094
Equipment Locations
more details
| Equipment | Start Date | End Date | X | Y | Z | Notes |
|---|---|---|---|---|---|---|
| Anemometer | 2000-10-22 | 2023-07-06 | 0 | 0 | 2.024 | Heading=14deg, Main sonic |
| 2023-07-06 | - | 0 | 0 | 2.21 | Heading=14deg, Sonic raised 19cm to try to improve frequency response | |
| Anemometer B | 2017-04-10 | 2017-05-24 | 0 | 0.5 | 2.024 | Heading=14deg, Secondary sonic for inter-comparison |
| Barometer | 2000-10-22 | - | PRES-ElectBar | |||
| Battery Bank Main | 2000-10-08 | - | ||||
| Battery Bank SoilCO2 | 2012-02-16 | - | ||||
| CO2 probe East Profile | 2012-03-21 | - | -0.02 | GA_SOIL | ||
| 2012-03-21 | - | -0.04 | GA_SOIL | |||
| 2012-03-21 | - | -0.08 | GA_SOIL | |||
| 2017-09-12 | - | -0.16 | ||||
| CO2 probe North Profile | 2012-03-21 | - | -0.02 | GA_SOIL | ||
| 2012-03-21 | - | -0.04 | GA_SOIL | |||
| 2012-03-21 | - | -0.08 | GA_SOIL | |||
| 2017-09-12 | - | -0.16 | ||||
| CO2 probe West Profile | 2012-03-21 | - | -0.02 | GA_SOIL | ||
| 2012-03-21 | - | -0.04 | GA_SOIL | |||
| 2012-03-21 | - | -0.08 | GA_SOIL | |||
| 2017-09-12 | - | -0.16 | ||||
| Data Logger Met | 2000-10-22 | - | ||||
| 2004-07-24 | - | |||||
| Data Logger Soil CO2 | 2012-02-16 | 2020-12-01 | ||||
| Forced Diffusion East | 2017-10-18 | 2018-01-15 | 0 | |||
| Forced Diffusion North | 2017-10-25 | 2018-01-15 | 0 | |||
| Forced Diffusion West | 2017-10-18 | 2018-01-15 | 0 | Test with borrowed chamber | ||
| 2020-03-02 | - | 0 | New permanent chamber | |||
| Gas Analyzer CO2/H2O | 2000-10-22 | - | 2.003 | GA_OP-LI-COR LI-7500 | ||
| Heat Flux Plate A | 2000-10-07 | 2012-09-05 | -0.1 | SOIL_H-Plate | ||
| 2012-09-05 | - | Reinstalled after calibration near other plate | ||||
| Heat Flux Plate B | 2000-10-07 | - | -0.1 | SOIL_H-Plate | ||
| Heat Flux Plate C | 2000-10-07 | - | -0.1 | SOIL_H-Plate | ||
| Heat Flux Plate D | 2013-02-06 | - | ||||
| Heat Flux Plate E | 2013-02-06 | - | ||||
| Heat Flux Plate Peltier -16cm | 2013-02-06 | - | -0.16 | Peltier SOIL_H-Plate | ||
| Heat Flux Plate Peltier -2cm | 2013-02-06 | - | -0.02 | Peltier SOIL_H-Plate | ||
| Heat Flux Plate Peltier -32cm | 2013-02-06 | - | -0.32 | Peltier SOIL_H-Plate | ||
| Heat Flux Plate Peltier -4cm | 2013-02-06 | - | -0.04 | Peltier SOIL_H-Plate | ||
| Heat Flux Plate Peltier -8cm | 2013-02-06 | - | -0.08 | Peltier SOIL_H-Plate | ||
| Interface LI-7550 | 2013-01-01 | - | ||||
| LED sensor | 2004-07-24 | - | ||||
| Moisture Point Biomass | 2010-11-12 | - | ||||
| Moisture Point Gate | 2010-11-12 | - | ||||
| Moisture Point Solar | 2001-11-10 | - | ||||
| Moisture Point Tower | 2001-11-10 | - | ||||
| Multiplexer | 2009-10-28 | - | ||||
| Multiplexer Soil CO2 | 2012-02-16 | 2020-12-01 | ||||
| Multiplexer Thermocouple | 2000-10-22 | - | ||||
| Narrow Band Incoming | 2017-08-17 | 2018-04-25 | On rad boom about a meter from end | |||
| 2019-02-20 | - | On rad boom about a meter from end | ||||
| Narrow Band Reflected | 2017-08-17 | 2018-04-25 | At end of rad boom near PAR out | |||
| 2019-02-20 | - | At end of rad boom near PAR out | ||||
| Net Radiometer | 2000-10-22 | 2017-08-17 | RAD-Net radiometer | |||
| Net Radiometer 4-way | 2004-07-24 | - | ||||
| PAR Sensor Diffuse | 2004-07-24 | - | ||||
| PAR Sensor Incoming | 2000-10-22 | - | 2.76 | in RAD-PAR Quantum | ||
| PAR Sensor Incoming Cal | 2020-06-12 | - | 2.76 | |||
| PAR Sensor Reflected | 2000-10-22 | - | 2.5 | out RAD-PAR Quantum | ||
| PAR Sensor Reflected Cal | 2020-06-12 | - | 2.5 | |||
| Precipitation | 2000-10-22 | - | 2.69 | RAIN-TipBucGauge | ||
| RH & Temp | 2000-10-22 | - | ||||
| Soil Moisture Probe A | 2000-10-22 | - | 8.04 | -3.35 | -0.225 | SWC-TDR |
| Soil Moisture Probe B | 2000-10-22 | - | 8.07 | -6.15 | -0.125 | SWC-TDR |
| Soil Moisture Probe C | 2000-10-22 | - | 6.45 | -6.45 | -0.125 | SWC-TDR |
| Soil Moisture Probe D | 2000-10-22 | - | 4.37 | -7.05 | -0.225 | SWC-TDR |
| Soil Moisture Probe E | 2000-10-22 | - | 8.04 | -1.67 | -0.225 | SWC-TDR |
| Soil Moisture Probe F | 2000-10-22 | - | SWC-TDR | |||
| Soil Moisture Probe G Profile | 2022-05-26 | - | 1.72 | -11.49 | 0 | -0.05,-0.1,-0.2,-0.3,-0.4,-0.5 |
| Soil Moisture Probe H Profile | 2022-05-26 | - | 3.73 | -2.21 | 0 | -0.05,-0.1,-0.2,-0.3,-0.4,-0.5 |
| Soil Moisture Probe I Profile | 2022-05-26 | - | 8.51 | -0.51 | 0 | -0.05,-0.1,-0.2,-0.3,-0.4,-0.5 |
| Solar Controller Soil CO2 | 2012-02-16 | 2020-12-01 | ||||
| Solar Panel SoilCO2-A | 2012-02-16 | 2021-10-26 | ||||
| Solar Panel SoilCO2-B | 2012-02-16 | 2021-10-26 | ||||
| Thermocouple A -0.02m | 2004-07-24 | - | ||||
| Thermocouple A -0.04m | 2004-07-24 | - | ||||
| Thermocouple A -0.08m | 2004-07-24 | - | ||||
| Thermocouple A -0.16m | 2004-07-24 | - | ||||
| Thermocouple A -0.32m | 2004-07-24 | - | ||||
| Thermocouple B -0.02m | 2004-07-24 | - | ||||
| Thermocouple B -0.04m | 2004-07-24 | - | ||||
| Thermocouple B -0.08m | 2004-07-24 | - | ||||
| Thermocouple B -0.16m | 2004-07-24 | - | ||||
| Thermocouple B -0.32m | 2004-07-24 | - | ||||
| Thermocouple C -0.02m | 2004-07-24 | - | ||||
| Thermocouple C -0.04cm | 2004-07-24 | - | ||||
| Thermocouple C -0.08m | 2004-07-24 | - | ||||
| Thermocouple C -0.16m | 2004-07-24 | - | ||||
| Thermocouple C -0.32m | 2004-07-24 | - | ||||
| Thermocouple Peltier -0.02m | 2013-02-06 | - | ||||
| Thermocouple Peltier -0.04m | 2013-02-06 | - | ||||
| Thermocouple Peltier -0.08m | 2013-02-06 | - | ||||
| Thermocouple Peltier -0.16m | 2013-02-06 | - | ||||
| Thermocouple Peltier -0.32m | 2013-02-06 | - | ||||
| Weather Station A | 2019-04-30 | - | ||||
| Weather Station B | 2019-05-14 | - | Second Cal Val Arable |
Data Streams:
more data
| Code | First Day | Last Day | Description |
|---|---|---|---|
| VR_amp | 2000-10-22 | 2022-05-26 | Processed data loaded from the Ameriflux submission files including gap filled and partitioned values |
| VR_arable | 2019-05-01 | - | Hourly met data from an Arable Mark device. Raw is roughly 5min periods in UTC which is post processed to 30min data PST at end of averaging period. - stored in PST at end of averaging period. |
| VR_fdeast | 2017-10-18 | 2018-01-15 | Forced Diffusion chamber installed near the east soil co2 profile |
| VR_fdnorth | 2017-10-25 | - | Forced Diffusion chamber installed near the north soil co2 profile |
| VR_fdwest | 2017-10-18 | - | Forced diffusion chamber near the west soil co2 profile |
| VR_flux | 2000-10-22 | - | Half hour averages of the 10Hz flux data. |
| VR_met | 2000-10-22 | - | Met data collected at Vaira |
| VR_mp | 2000-10-22 | - | Soil moisture data from the Vaira Moisture Point probes. |
| VR_phenocam | 2011-10-18 | - | Camera data as processed by the Phenocam Project - undated infrequently |
| VR_pond | 2016-11-17 | - | Monitoring of the pond level. |
| VR_processed | 2000-10-22 | - | Data from the L1 processed data file |
| VR_processed3 | 2000-10-22 | - | Data from the L3 processed data file |
| VR_soilco2 | 2012-03-21 | 2022-05-10 | Soil CO2 data collected from nine Vaisala CO2 probes in three profiles. |
| VR_soilmet | 2000-10-22 | 2004-07-22 | Originally the soil sensors (TC, sm, SHF) were on a CR10x. 4-way radiometer and diffuse PAR were added later. All sensors were moved to CR23x on 2004-07-25 |
| VR_soilvue | 2022-05-26 | - | Data from SoilVUE soil moisture and temperature profile probes. |
Metadata and Data Sets:
more data
| Id | Type | Site | Dates | Frequency | Title | Description |
|---|---|---|---|---|---|---|
| 24 | Soils | TZ, VR | 2019-04-30 - 2019-04-30 | Once | Soil cores for C:N and microbial community | Soil samples were collected to be analyzed for soil moisture, bulk density, C:N, and microbial community. At each sampling location, soil samples were taken with a narrow corer at four depths: 0-10, 10-20, 20-30, 30-40 cm. At Vaira, samples were taken in six locations surrounding the tower site. At Tonzi, samples were taken in twelve locations in open locations and near trees. |
2004_VR_AmeriFluxReport.pdf - Ameriflux intercomparison from April 6-13, 2004 at Vaira Tower
2007_VR_AmerifluxReport.pdf - Ameriflux intercomparison from April 7-12, 2007 at Vaira Tower
2012_VR_AmerifluxReport.pdf - Ameriflux intercomparison from March 19-30, 2012 at Vaira Tower
VariaFall2012Narrative.pdf - Description and resolution of multiplexer problem at Vaira from 2012-11-17 to 2012-12-19
VariaSpring2012Narrative.pdf - Description and resolution of multiplexer problem at Vaira from 2012-02-14 to 2012-04-05
VariaWinter2010-11Narrative.pdf - Description and resolution of multiplexer problem at Vaira from 2010-12-30 to 2011-02-22
https://youtu.be/rcZxd647afM - 2020 daily gap-filled Planet Labs imagery for Tonzi and Vaira
Vaira LED vs SRS NDVI
Vaira NDVI Data
Forced Diffusion Tonzi Vaira
Vaira PAR Cross Compare
Vaira swap to new RH-T