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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
| Area-based nitrate-N loss rate |
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. |
Hydraulic loading rate | Nitrate loading (predicted) | Percent nitrate removal (predicted) | |
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Variable ID
variable.detail.varIdHelp
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14990 | 14983 | 14992 | 14991 | 14993 |
| J | Not reported | HLR | Not reported | Not reported | |
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Qualitative-Quantitative
variable.detail.continuousCategoricalHelp
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Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) | Quantitative (Cardinal Only) |
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Cardinal-Ordinal
variable.detail.cardinalOrdinalHelp
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Cardinal | Cardinal | Cardinal | Cardinal | Cardinal |
| gN m^-2 day^-1 | mg N L^-1 | m yr^-1 | kg N km^-2 yr^-1 | % |
Variable Typology
| Area-based nitrate-N loss rate |
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. |
Hydraulic loading rate | Nitrate loading (predicted) | Percent nitrate removal (predicted) | |
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Predictor-Intermediate-Response
variable.detail.displayVariableTypeHelp
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Intermediate (Computed) Variable |
Intermediate (Computed) Variable |
Intermediate (Computed) Variable |
Intermediate (Computed) Variable |
Intermediate (Computed) Variable |
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Predictor Variable Type
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Response Variable Type
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Data Source/Type
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
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Variable Classification Hierarchy
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5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
4. Human-Produced Stressor or Enhancer of Ecosystem Goods and Services Production |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
4. Human-Produced Stressor or Enhancer of Ecosystem Goods and Services Production |
5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
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--CICES categories: Ecosystem goods and services - or landscape-level indices of suitability to supply EGS |
--Human-caused release, presence or characteristics of polluting substances |
--Physical/chemical characteristics of nonliving ecosystem components |
--Human-caused release, presence or characteristics of polluting substances |
--CICES categories: Ecosystem goods and services - or landscape-level indices of suitability to supply EGS |
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----Suitability to supply regulation & maintenance services-Mediation of wastes |
----Release, presence or characteristics of reactive forms of nitrogen in air or water |
----Physical/chemical characteristics of water |
----Release, presence or characteristics of reactive forms of nitrogen in air or water |
----Suitability to supply regulation & maintenance services-Mediation of wastes |
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------Filtration/sequestration/storage/accumulation by ecosystems |
------Water volume or flow in rivers or streams |
------Filtration/sequestration/storage/accumulation by ecosystems |
Variable Spatial Characteristics
| Area-based nitrate-N loss rate |
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. |
Hydraulic loading rate | Nitrate loading (predicted) | Percent nitrate removal (predicted) | |
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Spatial Extent Area
variable.detail.spExtentHelp
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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 |
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Spatially Distributed?
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Yes | Yes | Yes | Yes | Yes |
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Observations Spatially Patterned?
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Yes | No | Yes | Yes | Yes |
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Spatial Grain Type
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area, for pixel or radial feature | Not applicable | area, for pixel or radial feature | area, for pixel or radial feature | area, for pixel or radial feature |
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Spatial Grain Size
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1 km2 | Not applicable | 1 km2 | 1 km2 | 1 km2 |
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Spatial Density
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Not applicable | Not reported | Not applicable | Not applicable | Not applicable |
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EnviroAtlas URL
variable.detail.enviroAtlasURLHelp
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Total Annual Nitrogen Deposition | National Hydrography Dataset Plus (NHD PlusV2) | Total Annual Nitrogen Deposition |
Variable Temporal Characteristics
| Area-based nitrate-N loss rate |
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. |
Hydraulic loading rate | Nitrate loading (predicted) | Percent nitrate removal (predicted) | |
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Temporal Extent
variable.detail.tempExtentHelp
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1990-1999 | 1973-1994 | 1990-1999 | 1990-1999 | 1990-1999 |
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Temporally Distributed?
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Yes | Yes | Yes | Yes | Yes |
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Regular Temporal Grain?
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Yes | Yes | Yes | Yes | Yes |
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Temporal Grain Size Value
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1 | 1 | 1 | 1 | 1 |
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Temporal Grain Size Units
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Day | year | year | year | year |
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Temporal Density
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Not applicable | Not applicable | Not applicable | Not applicable | Not applicable |
Variable Values
| Area-based nitrate-N loss rate |
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. |
Hydraulic loading rate | Nitrate loading (predicted) | Percent nitrate removal (predicted) | |
| Not reported | mgN L^-1 | Not reported | kg N km^-2 yr^-1 | Not reported | |
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Min Value
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Not reported | 0 | Not reported | 0 | Not reported |
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Max Value
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Not reported | 8 | Not reported | >4,000 | Not reported |
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Other Value Type
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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 |
Variable Variability and Sensitivity
| Area-based nitrate-N loss rate |
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. |
Hydraulic loading rate | Nitrate loading (predicted) | Percent nitrate removal (predicted) | |
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Variability Expression Given?
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No | No | No | No | No |
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Variability Metric
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None | None | None | None | None |
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Variability Value
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None | None | None | None | None |
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Variability Units
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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 |
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Variability Expression Used in Modeling?
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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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