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4 more TEAM entries: view reps -> |
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Site tower team member name (First Last/Family).: |
Sara Knox |
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Site tower team member role: |
Affilate (LIST(TEAM_ROLE)) |
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Site tower team member email: |
saraknox@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, 105 Hilgard Hall,Berkeley, CA USA 94720-3114 |
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Site tower shipping address: |
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Network affiliation(s) of the site.: |
AmeriFlux (LIST(NETWORK)) |
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1 more FLUX entries: view reps -> |
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Method used to measure the flux variables: |
Eddy Covariance (LIST(FLUX_METHOD)) |
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Flux variable measured: |
CO2 (LIST(FLUX_VARIABLE)) |
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Date when data collection for the reported flux variable/method started.: |
20131125 (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.: |
Continuous (LIST(FLUX_OPERATIONS)) |
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1 more FLUX entries: view reps -> |
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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 East End Wetland is a newly constructed restored wetland on Twitchell Island, CA. 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 site was previously a corn field. The wetland was designed to have a mix of vegetated and open water channels and ponds (due to surface elevation differences). Flooding of the wetland was done gradually beginning in January, 2014. Berms wind throughout the wetland to allow vehicle access. Tule and Cattail plant material from a nearby wetland were spread along the berms immediately prior to flooding to facilitate plant establishment and stabilization of the berms from wind/water erosion. The tower was installed on November 25, 2013. |
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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, and Twitchell East End Wetland 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.: |
38.10272748 (decimal deg ref WGS84) |
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Longitude of the site: |
-121.64131728 (decimal deg ref WGS84) |
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Elevation of the site above sea level: |
-5 (m) |
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Begin date of the location information: |
20131125 (YYYYMMDDHHMM) |
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Location information comments: |
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Vegetation type based on the IGBP definition.: |
WET (LIST(IGBP)) |
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Date when this vegetation type first applied: |
201401 (YYYYMMDDHHMM) |
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Vegetation type comments: |
cattail and tule vegetation |
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Land ownership type: |
public (LIST(LAND_OWNERSHIP)) |
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Land owner: |
State of California |
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Tower web site URL (maintained by tower team): |
(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: |
NONE (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: |
Csa (LIST(CLIMATE_KOEPPEN)) |
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Slope and/or relief of the site: |
Flat (LIST(TERRAIN)) |
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Direction the site is facing (Exposure): |
FLAT (LIST(ASPECT)) |
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Prevailing wind direction: |
W (LIST(DIR)) |
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Distance for which the ecosystem is homogeneous in the prevailing wind direction.: |
800 (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)) |
