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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 Environment
137 Mulford Hall
Berkeley, CA 94720 |
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Site tower shipping address: |
Joseph Verfaillie
UC Berkeley
54 Mulford Hall
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: |
The Twitchell Alfalfa site is an alfalfa field owned by the state of California and leased to third parties for farming. The tower was installed on May 24, 2013. This site and the surrounding region are part of the San Joaquin - Sacramento River Delta drained beginning in the 1850's and subsequently used for agriculture. The field has been alfalfa for more than 5 years. Crop rotation occurs every 5-6 years. The site is harvested by mowing and bailing several times per year. The site is irrigated by periodically by flooding ditches surrounding the field. |
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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 Mayberry Wetland, Twitchell Wetland, Sherman Island, Twitchell Island, Twitchell Alfalfa, and Twitchell Corn sites are as follows: 1) Describe differences in the fluxes of CO2, CH4, H2O, and energy between different land uses; 2) Understand the mechanisms controlling these fluxes; 3) Use ecosystem modeling to understand controls on these mechanisms under different environmental scenarios. These six sites were selected to capture a wide range of inundated conditions within the Sacramento-San Joaquin River Delta. The research focuses on the eddy covariance technique to measure CH4, CO2, H2O, and energy fluxes and works to combine measurements of both net fluxes and partitioned fluxes in order to achieve a mechanistic understanding of the ecological controls on current and future carbon flux in the Delta. |
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Site funding agencies/institutions (one column only): |
California Department of Water Resources |
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Latitude of the site.: |
38.11542167 (decimal deg ref WGS84) |
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Longitude of the site: |
-121.64666623 (decimal deg ref WGS84) |
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Elevation of the site above sea level: |
-9 (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.: |
CRO (LIST(IGBP)) |
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Date when this vegetation type first applied: |
(YYYYMMDDHHMM) |
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Vegetation type comments: |
Alfalfa (Medicago sativa) is a fast growing leguminous crop raised for animal feed of low stature. It is planted in rows and typically reaches 60-70 cm in height prior to harvest. |
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Land ownership type: |
public (LIST(LAND_OWNERSHIP)) |
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Land owner: |
California Department of Water Resources |
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Tower web site URL (maintained by tower team): |
http://nature.berkeley.edu/biometlab/sites.php?tab=US-Tw3 (URL) |
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Papers relevant for understanding the site: |
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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): |
Biometeorology Lab, University of California, Berkeley, PI: Dennis Baldocchi |
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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: |
15.6 (degrees C) |
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Climatological long-term mean annual average precipitation: |
421 (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: |
252 (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)) |
