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Variables Details
: (EM-883)
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EM Identity and Description
| EM-883 | |
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Document Author
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McKane, R. B., A. Brookes, K. Djang, M. Stieglitz, A. G. Abdelnour, F. Pan, J. J. Halama, P. B. Pettus and D. L. Phillips |
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Document Year
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2014 |
Variable General Info
NH4 pool (initial) ?Comment:The values specified should represent the sum of all 4 soil layers (total soil column) averaged across the watershed. On day 1 of a simulation, VELMA will use the specified parameter values to calculate the fraction of each nutrient’s total pool to allocate to each of the four soil layers. This is done uniformly for all grid cells on day 1. |
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Variable ID
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21290 |
| 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 |
| g N m^-2 |
Variable Typology
NH4 pool (initial) ?Comment:The values specified should represent the sum of all 4 soil layers (total soil column) averaged across the watershed. On day 1 of a simulation, VELMA will use the specified parameter values to calculate the fraction of each nutrient’s total pool to allocate to each of the four soil layers. This is done uniformly for all grid cells on day 1. |
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Predictor-Intermediate-Response
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Predictor |
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Predictor Variable Type
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Constant or Parameter |
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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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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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------Nitrogen presence (in terrestrial ecosystem components) |
Variable Spatial Characteristics
NH4 pool (initial) ?Comment:The values specified should represent the sum of all 4 soil layers (total soil column) averaged across the watershed. On day 1 of a simulation, VELMA will use the specified parameter values to calculate the fraction of each nutrient’s total pool to allocate to each of the four soil layers. This is done uniformly for all grid cells on day 1. |
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Spatial Extent Area
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Not recorded for Constant or Parameter Variables |
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Spatially Distributed?
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Not recorded for Constant or Parameter Variables |
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Observations Spatially Patterned?
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Not recorded for Constant or Parameter Variables |
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Spatial Grain Type
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Not recorded for Constant or Paarameter Variables |
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Spatial Grain Size
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Not recorded for Constant or Parameter Variables |
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Spatial Density
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Not recorded for Constant or Parameter Variables |
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EnviroAtlas URL
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Variable Temporal Characteristics
NH4 pool (initial) ?Comment:The values specified should represent the sum of all 4 soil layers (total soil column) averaged across the watershed. On day 1 of a simulation, VELMA will use the specified parameter values to calculate the fraction of each nutrient’s total pool to allocate to each of the four soil layers. This is done uniformly for all grid cells on day 1. |
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Temporal Extent
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Not recorded for Constant or Parameter Variables |
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Temporally Distributed?
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Not recorded for Constant or Parameter Variables |
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Regular Temporal Grain?
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Not recorded for Constant or Parameter Variables |
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Temporal Grain Size Value
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Not recorded for Constant or Parameter Variables |
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Temporal Grain Size Units
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Not recorded for Constant or Parameter Variables |
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Temporal Density
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Not recorded for Constant or Parameter Variables |
Variable Values
NH4 pool (initial) ?Comment:The values specified should represent the sum of all 4 soil layers (total soil column) averaged across the watershed. On day 1 of a simulation, VELMA will use the specified parameter values to calculate the fraction of each nutrient’s total pool to allocate to each of the four soil layers. This is done uniformly for all grid cells on day 1. |
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| Not applicable | |
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Min Value
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Not applicable |
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Max Value
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Not applicable |
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Other Value Type
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Not applicable |
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Other Value
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Not applicable |
Variable Variability and Sensitivity
NH4 pool (initial) ?Comment:The values specified should represent the sum of all 4 soil layers (total soil column) averaged across the watershed. On day 1 of a simulation, VELMA will use the specified parameter values to calculate the fraction of each nutrient’s total pool to allocate to each of the four soil layers. This is done uniformly for all grid cells on day 1. |
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Variability Expression Given?
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Not recorded for Constant or Parameter Variables |
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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 recorded for Constant or Parameter Variables |
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Variability Expression Used in Modeling?
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Not recorded for Constant or Parameter Variables |
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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