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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
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. |
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Variable ID
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14895 |
| Not reported | |
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Qualitative-Quantitative
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Quantitative (Cardinal Only) |
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Cardinal-Ordinal
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Cardinal |
| mg N L^-1 |
Variable Typology
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. |
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Predictor-Intermediate-Response
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Predictor |
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Predictor Variable Type
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Time- or Space-varying Variable |
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Response Variable Type
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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) ?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. |
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Variable Classification Hierarchy
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4. Human-Produced Stressor or Enhancer of Ecosystem Goods and Services Production |
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--Human-caused release, presence or characteristics of polluting substances |
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----Release, presence or characteristics of reactive forms of nitrogen in air or water |
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Variable Spatial Characteristics
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. |
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Spatial Extent Area
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>1,000,000 km^2 |
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Spatially Distributed?
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Yes |
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Observations Spatially Patterned?
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No |
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Spatial Grain Type
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Not applicable |
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Spatial Grain Size
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Not applicable |
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Spatial Density
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Not reported |
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EnviroAtlas URL
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Total Annual Nitrogen Deposition |
Variable Temporal Characteristics
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. |
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Temporal Extent
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1973-1994 |
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Temporally Distributed?
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Yes |
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Regular Temporal Grain?
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Yes |
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Temporal Grain Size Value
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1 |
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Temporal Grain Size Units
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month |
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Temporal Density
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Not applicable |
Variable Values
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. |
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| Not reported | |
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Min Value
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Not reported |
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Max Value
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Not reported |
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Other Value Type
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Not applicable |
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Other Value
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Not reported |
Variable Variability and Sensitivity
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. |
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Variability Expression Given?
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No |
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Variability Metric
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None |
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Variability Value
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None |
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Variability Units
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None |
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Resampling Used?
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Not applicable |
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Variability Expression Used in Modeling?
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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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