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2 more TEAM entries: view reps -> |
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Site tower team member name (First Last/Family).: |
Dennis Baldocchi |
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Site tower team member role: |
PI (LIST(TEAM_ROLE)) |
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Site tower team member email: |
baldocchi@berkeley.edu |
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Site tower team member institution (required for PI only): |
University of California, Berkeley |
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Site tower team member address (not required): |
Department of Environmental Science, Policy and Management, 130 Mulford Hall, Berkeley, CA 94720-3114, USA
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Site tower shipping address: |
Joseph Verfaillie
UC Berkeley
54 Mulford Hall MC3114
Berkeley, CA 94720
510-642-9368 |
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Network affiliation(s) of the site.: |
AmeriFlux (LIST(NETWORK)) |
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Method used to measure the flux variables: |
(LIST(FLUX_METHOD)) |
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Flux variable measured: |
(LIST(FLUX_VARIABLE)) |
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Date when data collection for the reported flux variable/method started.: |
(YYYYMMDDHHMM) |
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Date when data collection for the reported flux variable/method ended: |
(YYYYMMDDHHMM) |
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Operational status of flux measurements.: |
(LIST(FLUX_OPERATIONS)) |
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Flux measurements comments: |
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State or province: |
CA (LIST(STATE_PROVINCE)) |
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Short description of the site characteristics and history: |
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. |
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Site research topics: |
The research approach of the University of California, Berkeley Biometeorology Laboratory involves the coordinated use of experimental measurements and theoretical models to understand the physical, biological, and chemical processes that control trace gas fluxes between the biosphere and atmosphere and to quantify their temporal and spatial variations. The research objectives of the Vaira Ranch site span from overall project goals to publication-specific topics. They are as follows: 1) Comparing radiative, convective and latent energy flux densities of an annual grassland over the course of multiple growing seasons; 2) The relative contributions of vegetation and the soil on CO2 and water vapor exchange; 3) Spatial variability of understory fluxes; 4) The impact of sloping terrain on the interpretation of flux covariances; 5) Characterize evapotranspiration, energy fluxes and related bulk parameters in monthly and annual timescales; 6) Investigate which abiotic and biotic factors control the interannual variability of water and energy fluxes; 7) The influence of growing season length on annual evapotranspiration amount; 8) Transition timing of energy-limited to water-limited modulate annual amount of evapotranspiration; 9) The controlling factors of evapotranspiration and atmospheric demand or stomatal regulation; 10) The response of evapotranspiration to changes in solar radiation amounts in water-limited and energy-limited periods. |
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Site funding agencies/institutions (one column only): |
DOE/TCP |
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Latitude of the site.: |
38.4133 (decimal deg ref WGS84) |
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Longitude of the site: |
-120.95073 (decimal deg ref WGS84) |
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Elevation of the site above sea level: |
129 (m) |
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Begin date of the location information: |
(YYYYMMDDHHMM) |
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Location information comments: |
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Vegetation type based on the IGBP definition.: |
GRA (LIST(IGBP)) |
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Date when this vegetation type first applied: |
(YYYYMMDDHHMM) |
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Vegetation type comments: |
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Land ownership type: |
private (LIST(LAND_OWNERSHIP)) |
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Land owner: |
Vaira Family |
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1 more URL entries: view reps -> |
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Tower web site URL (maintained by tower team): |
http://nature.berkeley.edu/biometlab/index.php?tab=Sites (URL) |
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9 more REFERENCE entries: view reps -> |
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Papers relevant for understanding the site: |
Xu, L. and Baldocchi, D.D., 2004. Seasonal variation in carbon dioxide exchange over a Mediterranean annual grassland in California. Agricultural and Forest Meteorology, 123(1-2): 79-96. |
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DOI of the reference: |
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Suggested use of the reference: |
(LIST(REFERENCE_USAGE)) |
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Brief description of paper relevance or other comments: |
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Acknowledgement text (88 character limit): |
This research was supported in part by the Office of Science (BER), U.S. Department of Energy, Grant No. DE-FG02-03ER63638 |
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Additional information about the acknowledgement: |
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Offset from UTC of site data: |
-8 (hours) |
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Begin date of the UTC offset: |
(YYYYMMDDHHMM) |
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Offset from UTC comments: |
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Climatological long-term mean annual average air temperature: |
15.8 (degrees C) |
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Climatological long-term mean annual average precipitation: |
559 (mm) |
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K�ppen climate classification: |
(LIST(CLIMATE_KOEPPEN)) |
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Slope and/or relief of the site: |
(LIST(TERRAIN)) |
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Direction the site is facing (Exposure): |
(LIST(ASPECT)) |
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Prevailing wind direction: |
220 (LIST(DIR)) |
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Distance for which the ecosystem is homogeneous in the prevailing wind direction.: |
(m) |
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Days per year that the site is covered by snow: |
(days) |
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Recent and historic disturbance and management events that affect the tower site years of measurement: |
(LIST(DIST_MGMT)) |
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Type of physical tower structure used in the site: |
(LIST(TOWER_TYPE)) |
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How the eddy covariance system is powered: |
(LIST(TOWER_POWER)) |
