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Variables Details
: (EM-627)
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EM Identity and Description
| EM-627 | |
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Document Author
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Crumpton, W. G., G. A. Stenback, B. A. Miller, and M. J. Helmers |
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Document Year
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2006 |
Variable General Info
Annual discharge ?Comment:USGS NASQAN nitrate concentration data are available for stations across the UMR and Ohio River basins at an approximately monthly sampling interval from 1973 through 1994 (Alexander et al. 1998), although sampling frequency varied over time at some stations. In general, daily discharge data are available. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Drainage area (above wetland) |
Nitrate concentration (water) ?Comment:USGS NASQAN nitrate concentration data are available for stations across the UMR and Ohio River basins at an approximately monthly sampling interval from 1973 through 1994 (Alexander et al. 1998), although sampling frequency varied over time at some stations. In general, daily discharge data are available. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Percent crop land ?Comment:Based on spatial analysis of 1992 Landsat land cover data for the UmR and Ohio River basins. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Temperature (air) |
Water yield ?Comment:The annual water yield for each grid cell was estimated by interpolation of annual water yields from USGS stream monitoring stations with less than 1000 square mile watersheds and selected to encompass the UMR and Ohio River basins. |
Wetland area | |
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Variable ID
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14982 | 14985 | 14895 | 14894 | 14988 | 14984 | 14986 |
| Not reported | Not reported | Not reported | Not reported | T | Not reported | Not reported | |
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Qualitative-Quantitative
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Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) |
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Cardinal-Ordinal
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Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal | Cardinal |
| m^3 | km^2 | mg N L^-1 | % | °C | cm year^-1 | km^2 |
Variable Typology
Annual discharge ?Comment:USGS NASQAN nitrate concentration data are available for stations across the UMR and Ohio River basins at an approximately monthly sampling interval from 1973 through 1994 (Alexander et al. 1998), although sampling frequency varied over time at some stations. In general, daily discharge data are available. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Drainage area (above wetland) |
Nitrate concentration (water) ?Comment:USGS NASQAN nitrate concentration data are available for stations across the UMR and Ohio River basins at an approximately monthly sampling interval from 1973 through 1994 (Alexander et al. 1998), although sampling frequency varied over time at some stations. In general, daily discharge data are available. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Percent crop land ?Comment:Based on spatial analysis of 1992 Landsat land cover data for the UmR and Ohio River basins. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Temperature (air) |
Water yield ?Comment:The annual water yield for each grid cell was estimated by interpolation of annual water yields from USGS stream monitoring stations with less than 1000 square mile watersheds and selected to encompass the UMR and Ohio River basins. |
Wetland area | |
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Predictor-Intermediate-Response
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Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
Predictor |
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Predictor Variable Type
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Time- or Space-varying Variable |
Time- or Space-varying Variable |
Time- or Space-varying Variable |
Time- or Space-varying Variable |
Time- or Space-varying Variable |
Time- or Space-varying Variable |
Time- or Space-varying Variable |
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Response Variable Type
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Data Source/Type
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Map or database (e.g., wide coverage, wide availability, measured or modeled) | Map or database (e.g., wide coverage, wide availability, measured or modeled) |
Map or database (e.g., wide coverage, wide availability, measured or modeled) ?Comment:Nitrate concentration and stream discharge data were obtained from the U.S. Geological Survey (USGS) National Stream Quality Accounting Network (NASQAN) and National Water Information System (NWIS) for selected gage/sampling stations in the UMR and Ohio River basins. |
Map or database (e.g., wide coverage, wide availability, measured or modeled) | Map or database (e.g., wide coverage, wide availability, measured or modeled) | Map or database (e.g., wide coverage, wide availability, measured or modeled) | Local field/Lab data (e.g., particular to the EM study) |
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Variable Classification Hierarchy
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5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric |
4. Human-Produced Stressor or Enhancer of Ecosystem Goods and Services Production |
2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
2. Land Surface (or Water Body) Cover, Use, Substrate, or Metric |
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--Physical/chemical characteristics of nonliving ecosystem components |
--Spatial resolution or extent of cell, pixel, polygon |
--Human-caused release, presence or characteristics of polluting substances |
--Land use/land cover type or dominant habitat type |
--Physical/chemical characteristics of nonliving ecosystem components |
--Physical/chemical characteristics of nonliving ecosystem components |
--Land use/land cover type or dominant habitat type |
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----Physical/chemical characteristics of water |
----Release, presence or characteristics of reactive forms of nitrogen in air or water |
----Agroecosystems |
----Physical/chemical characteristics of air, meteorology and precipitation |
----Physical/chemical characteristics of water |
----Inland wetlands |
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------Water volume or flow in rivers or streams |
------Other, multiple, unspecified or unclear |
------Meteorology data and parameters (including precipitation) |
------Water volume or flow in rivers or streams |
Variable Spatial Characteristics
Annual discharge ?Comment:USGS NASQAN nitrate concentration data are available for stations across the UMR and Ohio River basins at an approximately monthly sampling interval from 1973 through 1994 (Alexander et al. 1998), although sampling frequency varied over time at some stations. In general, daily discharge data are available. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Drainage area (above wetland) |
Nitrate concentration (water) ?Comment:USGS NASQAN nitrate concentration data are available for stations across the UMR and Ohio River basins at an approximately monthly sampling interval from 1973 through 1994 (Alexander et al. 1998), although sampling frequency varied over time at some stations. In general, daily discharge data are available. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Percent crop land ?Comment:Based on spatial analysis of 1992 Landsat land cover data for the UmR and Ohio River basins. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Temperature (air) |
Water yield ?Comment:The annual water yield for each grid cell was estimated by interpolation of annual water yields from USGS stream monitoring stations with less than 1000 square mile watersheds and selected to encompass the UMR and Ohio River basins. |
Wetland area | |
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Spatial Extent Area
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>1,000,000 km^2 | >1,000,000 km^2 | >1,000,000 km^2 | >1,000,000 km^2 | >1,000,000 km^2 | >1,000,000 km^2 | >1,000,000 km^2 |
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Spatially Distributed?
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Yes | Yes | Yes | Yes | Yes | Yes | Yes |
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Observations Spatially Patterned?
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No | Yes | No | Yes | No | Yes | Yes |
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Spatial Grain Type
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Not applicable | area, for pixel or radial feature | Not applicable | area, for pixel or radial feature | Not applicable | area, for pixel or radial feature | area, for pixel or radial feature |
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Spatial Grain Size
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Not applicable | 1 km2 | Not applicable | 1 km2 | Not applicable | 1 km2 | 1 km2 |
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Spatial Density
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Not reported | Not applicable | Not reported | Not applicable | Not reported | Not applicable | Not applicable |
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EnviroAtlas URL
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National Hydrography Dataset Plus (NHD PlusV2) | Total Annual Nitrogen Deposition | GAP Ecological Systems | Average Annual Precipitation | National Hydrography Dataset Plus (NHD PlusV2) | GAP Ecological Systems |
Variable Temporal Characteristics
Annual discharge ?Comment:USGS NASQAN nitrate concentration data are available for stations across the UMR and Ohio River basins at an approximately monthly sampling interval from 1973 through 1994 (Alexander et al. 1998), although sampling frequency varied over time at some stations. In general, daily discharge data are available. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Drainage area (above wetland) |
Nitrate concentration (water) ?Comment:USGS NASQAN nitrate concentration data are available for stations across the UMR and Ohio River basins at an approximately monthly sampling interval from 1973 through 1994 (Alexander et al. 1998), although sampling frequency varied over time at some stations. In general, daily discharge data are available. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Percent crop land ?Comment:Based on spatial analysis of 1992 Landsat land cover data for the UmR and Ohio River basins. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Temperature (air) |
Water yield ?Comment:The annual water yield for each grid cell was estimated by interpolation of annual water yields from USGS stream monitoring stations with less than 1000 square mile watersheds and selected to encompass the UMR and Ohio River basins. |
Wetland area | |
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Temporal Extent
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1973-1994 | 1992 | 1973-1994 | 1992 | 1990-1999 | 1990-1999 | 1992 |
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Temporally Distributed?
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Yes | No | Yes | No | Yes | Yes | No |
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Regular Temporal Grain?
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Yes | Not applicable | Yes | Not applicable | Yes | Yes | Not applicable |
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Temporal Grain Size Value
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1 | Not applicable | 1 | Not applicable | 1 | 1 | Not applicable |
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Temporal Grain Size Units
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Day | Not applicable | month | Not applicable | Day | Day | Not applicable |
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Temporal Density
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
Variable Values
Annual discharge ?Comment:USGS NASQAN nitrate concentration data are available for stations across the UMR and Ohio River basins at an approximately monthly sampling interval from 1973 through 1994 (Alexander et al. 1998), although sampling frequency varied over time at some stations. In general, daily discharge data are available. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Drainage area (above wetland) |
Nitrate concentration (water) ?Comment:USGS NASQAN nitrate concentration data are available for stations across the UMR and Ohio River basins at an approximately monthly sampling interval from 1973 through 1994 (Alexander et al. 1998), although sampling frequency varied over time at some stations. In general, daily discharge data are available. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Percent crop land ?Comment:Based on spatial analysis of 1992 Landsat land cover data for the UmR and Ohio River basins. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Temperature (air) |
Water yield ?Comment:The annual water yield for each grid cell was estimated by interpolation of annual water yields from USGS stream monitoring stations with less than 1000 square mile watersheds and selected to encompass the UMR and Ohio River basins. |
Wetland area | |
| Not reported | Not reported | Not reported | Not reported | Not reported |
cm year^-1 ?Comment:Mapped data by year. |
Not reported | |
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Min Value
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Not reported | Not reported | Not reported | Not reported | 4 | 1 | Not reported |
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Max Value
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Not reported | Not reported | Not reported | Not reported | Not reported | 120 | Not reported |
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Other Value Type
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Other Value
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Not reported | Not reported | Not reported | Not reported | Not reported | Not reported | Not reported |
Variable Variability and Sensitivity
Annual discharge ?Comment:USGS NASQAN nitrate concentration data are available for stations across the UMR and Ohio River basins at an approximately monthly sampling interval from 1973 through 1994 (Alexander et al. 1998), although sampling frequency varied over time at some stations. In general, daily discharge data are available. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Drainage area (above wetland) |
Nitrate concentration (water) ?Comment:USGS NASQAN nitrate concentration data are available for stations across the UMR and Ohio River basins at an approximately monthly sampling interval from 1973 through 1994 (Alexander et al. 1998), although sampling frequency varied over time at some stations. In general, daily discharge data are available. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Percent crop land ?Comment:Based on spatial analysis of 1992 Landsat land cover data for the UmR and Ohio River basins. This variable was used in the Flow Weighted Average (FWA) nitrate concentration based on land use submodel. |
Temperature (air) |
Water yield ?Comment:The annual water yield for each grid cell was estimated by interpolation of annual water yields from USGS stream monitoring stations with less than 1000 square mile watersheds and selected to encompass the UMR and Ohio River basins. |
Wetland area | |
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Variability Expression Given?
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No | No | No | No | No | No | No |
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Variability Metric
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None | None | None | None | None | None | None |
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Variability Value
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None | None | None | None | None | None | None |
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Variability Units
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None | None | None | None | None | None | None |
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Resampling Used?
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Variability Expression Used in Modeling?
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
Variable Operational Validation (Response Variables only)
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Variable ID
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Validated?
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Validation Approach (within, between, etc.)
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Validation Quality (Qual/Quant)
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Validation Method (Stat/Deviance)
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Validation Metric
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Validation Value
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Validation Units
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Use of Measured Response Data
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