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Variables Details
: (EM-63)
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EM Identity and Description
| EM-63 | |
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Document Author
variable.detail.emDocumentAuthorHelp
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US EPA Office of Research and Development - National Exposure Research Laboratory |
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Document Year
variable.detail.emDocumentYearHelp
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2013 |
Variable General Info
Natural BNF per HUC12 ?Comment:BNF in natural/semi-natural ecosystems within individual HUC12s was modeled with an equation (Cleveland et al. 1999) describing the statistical relationship between BNF and actual evapotranspiration (AET) and scaled to the proportion of non-developed and non-agricultural land in the HUC12. |
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Variable ID
variable.detail.varIdHelp
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10668 |
| BNF | |
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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 |
| kg N ha^-1 yr^-1 |
Variable Typology
Natural BNF per HUC12 ?Comment:BNF in natural/semi-natural ecosystems within individual HUC12s was modeled with an equation (Cleveland et al. 1999) describing the statistical relationship between BNF and actual evapotranspiration (AET) and scaled to the proportion of non-developed and non-agricultural land in the HUC12. |
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Predictor-Intermediate-Response
variable.detail.displayVariableTypeHelp
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Response |
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Predictor Variable Type
variable.detail.displayPredictorVariableTypeHelp
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Not applicable |
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Response Variable Type
variable.detail.resClassHelp
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Computed Variable |
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Data Source/Type
variable.detail.dataTypeHelp
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Not applicable |
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Variable Classification Hierarchy
variable.detail.vchLevel1Help
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5. Ecosystem Attributes and Potential Supply of Ecosystem Goods and Services |
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--Chemical (C, N, P, sediment/particulate) characteristics of ecosystem components |
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----Nitrogen-related characteristics of ecosystem components |
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------Biological nitrogen fixation |
Variable Spatial Characteristics
Natural BNF per HUC12 ?Comment:BNF in natural/semi-natural ecosystems within individual HUC12s was modeled with an equation (Cleveland et al. 1999) describing the statistical relationship between BNF and actual evapotranspiration (AET) and scaled to the proportion of non-developed and non-agricultural land in the HUC12. |
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Spatial Extent Area
variable.detail.spExtentHelp
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>1,000,000 km^2 |
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Spatially Distributed?
variable.detail.spDistributedHelp
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Yes |
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Observations Spatially Patterned?
variable.detail.regularSpGrainHelp
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Yes |
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Spatial Grain Type
variable.detail.spGrainTypeHelp
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other (specify), for irregular (e.g., stream reach, lake basin) ?Comment:12 digit HUC. |
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Spatial Grain Size
variable.detail.spGrainSizeHelp
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irregular |
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Spatial Density
variable.detail.spDensityHelp
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Not applicable |
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EnviroAtlas URL
variable.detail.enviroAtlasURLHelp
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Variable Temporal Characteristics
Natural BNF per HUC12 ?Comment:BNF in natural/semi-natural ecosystems within individual HUC12s was modeled with an equation (Cleveland et al. 1999) describing the statistical relationship between BNF and actual evapotranspiration (AET) and scaled to the proportion of non-developed and non-agricultural land in the HUC12. |
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Temporal Extent
variable.detail.tempExtentHelp
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2006-2010 |
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Temporally Distributed?
variable.detail.tempDistributedHelp
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Not applicable |
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Regular Temporal Grain?
variable.detail.regularTempGrainHelp
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Not applicable |
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Temporal Grain Size Value
variable.detail.tempGrainSizeValHelp
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Not applicable |
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Temporal Grain Size Units
variable.detail.tempGrainSizeUnitHelp
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Not applicable |
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Temporal Density
variable.detail.tempDensityHelp
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Not applicable |
Variable Values
Natural BNF per HUC12 ?Comment:BNF in natural/semi-natural ecosystems within individual HUC12s was modeled with an equation (Cleveland et al. 1999) describing the statistical relationship between BNF and actual evapotranspiration (AET) and scaled to the proportion of non-developed and non-agricultural land in the HUC12. |
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| kg N ha^-1 yr^-1 | |
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Min Value
variable.detail.minEstHelp
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0.0 |
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Max Value
variable.detail.estHelp
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11.64 |
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Other Value Type
variable.detail.natureOtherEstHelp
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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
Natural BNF per HUC12 ?Comment:BNF in natural/semi-natural ecosystems within individual HUC12s was modeled with an equation (Cleveland et al. 1999) describing the statistical relationship between BNF and actual evapotranspiration (AET) and scaled to the proportion of non-developed and non-agricultural land in the HUC12. |
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Variability Expression Given?
variable.detail.variabilityExpHelp
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No |
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Variability Metric
variable.detail.variabilityMetricHelp
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None |
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Variability Value
variable.detail.variabilityValueHelp
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None |
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Variability Units
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None |
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Resampling Used?
variable.detail.bootstrappingHelp
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Not applicable |
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Variability Expression Used in Modeling?
variable.detail.variabilityUsedHelp
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Not applicable |
Variable Operational Validation (Response Variables only)
| Natural BNF per HUC12 | |
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Variable ID
variable.detail.varIdHelp
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10668 |
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Validated?
variable.detail.resValidatedHelp
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Not applicable |
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Validation Approach (within, between, etc.)
variable.detail.validationApproachHelp
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None |
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Validation Quality (Qual/Quant)
variable.detail.validationQualityHelp
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None |
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Validation Method (Stat/Deviance)
variable.detail.validationMethodHelp
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None |
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Validation Metric
variable.detail.validationMetricHelp
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None |
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Validation Value
variable.detail.validationValHelp
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None |
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Validation Units
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None |
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Use of Measured Response Data
variable.detail.measuredResponseDataHelp
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None |