| Total Deposition of Reduced and Oxidized Nitrogen During 2002 | |
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Data format: KML Vector Dataset File or table name: California_N_dep_2002.kmz Coordinate system: Geographic Coordinate System, WGS 1984 Theme keywords: University of California - Riverside, Center for Conservation Biology, Biocomplexity Project, nitrogen deposition, biodiversity, eutrophication, College of Engineering - Center for Environmental Research & Technology, CMAQ |
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Abstract:
CMAQ model output for total annual (wet & dry) deposition of reduced species of N (NH3, NH4) and oxidized species of N (NO, NO2, NO3, N2O5, HNO3, HONO, & PAN) during all of 2002 throughout California. Data are provided at two resolutions (4 and 36 kilometers) and were produced from two separate CMAQ model runs. The 4km resolution data extent covers the majority of the state. 36km data are provided only in those areas within California that were outside the 4km modeled extent. Some of the 36km polygons along the contact with the 4km data and the state line are truncated.
The deposition value for each cell is recorded in units of kilograms of nitrogen per hectare per year. To obtain the value, right click an individual polygon (cell) and select "properties" from the context menu. The "name" of the cell shown in the dialog box is the actual value.
Deposition values do not always make a smooth transition between the 4 and 36km resolution data. Model data are supplied by the Biocomplexity Project atmospheric modeling group at College of Engineering/ Center for Environmental Research and Technology (CE-CERT) under direction of Gail Tonnesen. This dataset is provided by the Center for Conservation Biology at the University of California - Riverside as a data product of the Biocomplexity Project, funded by NSF-DEB 0421530. |
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CMAQ model output for total annual (wet & dry) deposition of reduced species of N (NH3, NH4) and oxidized species of N (NO, NO2, NO3, N2O5, HNO3, HONO, & PAN) during all of 2002 throughout California. Data are provided at two resolutions (4 and 36 kilometers) and were produced from two separate CMAQ model runs. The 4km resolution data extent covers the majority of the state. 36km data are provided only in those areas within California that were outside the 4km modeled extent. Some of the 36km polygons along the contact with the 4km data and the state line are truncated. The deposition value for each cell is recorded in units of kilograms of nitrogen per hectare per year. To obtain the value, right click an individual polygon (cell) and select "properties" form the context menu. The "name" of the cell shown in the dialog box is the actual value. Deposition values do not always make a smooth transition between the 4 and 36km resolution data. Model data are supplied by the Biocomplexity Project atmospheric modeling group at College of Engineering/ Center for Environmental Research and Technology (CE-CERT) under direction of Gail Tonnesen. This dataset is provided by the Center for Conservation Biology at the University of California - Riverside as a data product of the Biocomplexity Project, funded by NSF-DEB 0421530.
Provides a geography of annual nitrogen deposition throughout most of the state of California including locations where there are no measurement data. Supports study of effect of anthropogenic nitrogen on the structure and function of terrestrial ecosystems.
ground condition
Individuals and institutions utilizing these data are requested to acknowledge authors and report (below) in any publication in which these data are mentioned: Tonnesen, G., Z. Wang, M. Omary, and C. J. Chien. 2007. Assessment of Nitrogen Deposition: Modeling and Habitat Assessment. California Energy Commission, PIER Energy-Related Environmental Research. CEC-500-2005-032. It is the user's responsibility to understand the specific characteristics and limitations of the dataset. The Center for Environmental Research and Technology and the Center for Conservation Biology expressly disclaim responsibility for damages or liability that may arise from use of this data.
1084 Columbia Ave.
CMAQ model dataset produced by UCR/CE-CERT personnel (Gail Tonnesen et al.); UCR/CCB GIS conversion: Robert F. Johnson; UCR/CCB project management: Edith Allen.
not applicable
Uncertain. There is inadequate ambient measurement data to evaluate model output.
not applicable
CMAQ model output
Conversion from ASCII to ArcGIS GRID raster format
assigned CMAQ standard Lambert Conformal Conic projection as spatial reference
projected to UTM Zone 11N, NAD27
36 km resolution dataset snapped to match 4 km resolution alignment
36 & 4 km resolution data extent trimmed to California state extent
36 km data within California trimmed by extent of 4 km resolution data
36 km resolution data appended to 4 km data
Internal feature number.
ESRI
kilograms of nitrogen deposited per hectare per year
tally of raster cells for a specific value
1303 Webber Hall
University of California
1303 Webber Hall
University of California