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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
Flow weighted average nitrate concentration based on percent crop land ?Comment:Estimated annual nitrate loading values determined by a linear interpolation method were divided by annual discharge to obtain annual FWA nitrate concentrations for each measurement station. Percent land use data for 1987 urban land, crop land, pasture land, forest land, range land, farm land, and other land available on the NASQAN web pages were used to determine a relationship between average flow-weighted nitrate concentration and land use for selected sites in the UMR and Ohio River drainage basins. |
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Variable ID
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14983 |
| Not reported | |
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Qualitative-Quantitative
variable.detail.continuousCategoricalHelp
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Quantitative (Cardinal Only) |
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Cardinal-Ordinal
variable.detail.cardinalOrdinalHelp
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Cardinal |
| mg N L^-1 |
Variable Typology
Flow weighted average nitrate concentration based on percent crop land ?Comment:Estimated annual nitrate loading values determined by a linear interpolation method were divided by annual discharge to obtain annual FWA nitrate concentrations for each measurement station. Percent land use data for 1987 urban land, crop land, pasture land, forest land, range land, farm land, and other land available on the NASQAN web pages were used to determine a relationship between average flow-weighted nitrate concentration and land use for selected sites in the UMR and Ohio River drainage basins. |
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Predictor-Intermediate-Response
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Intermediate (Computed) Variable |
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Predictor Variable Type
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Not applicable |
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Response Variable Type
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Not applicable |
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Data Source/Type
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Not applicable |
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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
Flow weighted average nitrate concentration based on percent crop land ?Comment:Estimated annual nitrate loading values determined by a linear interpolation method were divided by annual discharge to obtain annual FWA nitrate concentrations for each measurement station. Percent land use data for 1987 urban land, crop land, pasture land, forest land, range land, farm land, and other land available on the NASQAN web pages were used to determine a relationship between average flow-weighted nitrate concentration and land use for selected sites in the UMR and Ohio River drainage basins. |
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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?
variable.detail.regularSpGrainHelp
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No |
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Spatial Grain Type
variable.detail.spGrainTypeHelp
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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
variable.detail.spDensityHelp
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Not reported |
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EnviroAtlas URL
variable.detail.enviroAtlasURLHelp
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Total Annual Nitrogen Deposition |
Variable Temporal Characteristics
Flow weighted average nitrate concentration based on percent crop land ?Comment:Estimated annual nitrate loading values determined by a linear interpolation method were divided by annual discharge to obtain annual FWA nitrate concentrations for each measurement station. Percent land use data for 1987 urban land, crop land, pasture land, forest land, range land, farm land, and other land available on the NASQAN web pages were used to determine a relationship between average flow-weighted nitrate concentration and land use for selected sites in the UMR and Ohio River drainage basins. |
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Temporal Extent
variable.detail.tempExtentHelp
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1973-1994 |
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Temporally Distributed?
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Yes |
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Regular Temporal Grain?
variable.detail.regularTempGrainHelp
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Yes |
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Temporal Grain Size Value
variable.detail.tempGrainSizeValHelp
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1 |
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Temporal Grain Size Units
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year |
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Temporal Density
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Not applicable |
Variable Values
Flow weighted average nitrate concentration based on percent crop land ?Comment:Estimated annual nitrate loading values determined by a linear interpolation method were divided by annual discharge to obtain annual FWA nitrate concentrations for each measurement station. Percent land use data for 1987 urban land, crop land, pasture land, forest land, range land, farm land, and other land available on the NASQAN web pages were used to determine a relationship between average flow-weighted nitrate concentration and land use for selected sites in the UMR and Ohio River drainage basins. |
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| mgN L^-1 | |
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Min Value
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0 |
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Max Value
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8 |
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Other Value Type
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Not applicable |
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Other Value
variable.detail.otherEstHelp
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Not reported |
Variable Variability and Sensitivity
Flow weighted average nitrate concentration based on percent crop land ?Comment:Estimated annual nitrate loading values determined by a linear interpolation method were divided by annual discharge to obtain annual FWA nitrate concentrations for each measurement station. Percent land use data for 1987 urban land, crop land, pasture land, forest land, range land, farm land, and other land available on the NASQAN web pages were used to determine a relationship between average flow-weighted nitrate concentration and land use for selected sites in the UMR and Ohio River drainage basins. |
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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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