EcoService Models Library (ESML)
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Variables Details
: (EM-892)
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EM Identity and Description
EM-892 | |
Document Author
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McKane |
Document Year
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Variable General Info
Decay rate (maximum) ?Comment:Constant value determined by the class variable; Contaminant. The maximum daily decay rate constant (fraction per day) of a specified contaminant. The Comptox library (https://comptox.epa.gov/#/) lists the half-life for most organic contaminants, from which the daily maximum decay rate constant can be calculated and specified for this parameter. Users can enter the specified half-life value into an online calculator to calculate the decay constant. For example, see https://www.calculator.net/half-life-calculator.html?type=2&chalflife=4&cmeanlifetime=&cdecayconstant=&x=35&y=16. Note that decomposed contaminant amounts are not tracked by the simulation and not reported in its results. This is because contaminants almost always make up an insignificant fraction of the total amount of organic matter within soils. |
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Variable ID
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22101 |
Not reported | |
Qualitative-Quantitative
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Quantitative (Cardinal Only) |
Cardinal-Ordinal
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Cardinal |
% day^-1 |
Variable Typology
Decay rate (maximum) ?Comment:Constant value determined by the class variable; Contaminant. The maximum daily decay rate constant (fraction per day) of a specified contaminant. The Comptox library (https://comptox.epa.gov/#/) lists the half-life for most organic contaminants, from which the daily maximum decay rate constant can be calculated and specified for this parameter. Users can enter the specified half-life value into an online calculator to calculate the decay constant. For example, see https://www.calculator.net/half-life-calculator.html?type=2&chalflife=4&cmeanlifetime=&cdecayconstant=&x=35&y=16. Note that decomposed contaminant amounts are not tracked by the simulation and not reported in its results. This is because contaminants almost always make up an insignificant fraction of the total amount of organic matter within soils. |
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Predictor-Intermediate-Response
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Predictor |
Predictor Variable Type
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Constant or Parameter |
Response Variable Type
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Not applicable |
Data Source/Type
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Not applicable |
Variable Classification Hierarchy
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4. Human-Produced Stressor or Enhancer of Ecosystem Goods and Services Production |
--Human-caused release, presence or characteristics of polluting substances |
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----Other, multiple, unspecified or unclear |
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Variable Spatial Characteristics
Decay rate (maximum) ?Comment:Constant value determined by the class variable; Contaminant. The maximum daily decay rate constant (fraction per day) of a specified contaminant. The Comptox library (https://comptox.epa.gov/#/) lists the half-life for most organic contaminants, from which the daily maximum decay rate constant can be calculated and specified for this parameter. Users can enter the specified half-life value into an online calculator to calculate the decay constant. For example, see https://www.calculator.net/half-life-calculator.html?type=2&chalflife=4&cmeanlifetime=&cdecayconstant=&x=35&y=16. Note that decomposed contaminant amounts are not tracked by the simulation and not reported in its results. This is because contaminants almost always make up an insignificant fraction of the total amount of organic matter within soils. |
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Spatial Extent Area
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Not recorded for Constant or Parameter Variables |
Spatially Distributed?
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Not recorded for Constant or Parameter Variables |
Observations Spatially Patterned?
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Not recorded for Constant or Parameter Variables |
Spatial Grain Type
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Not recorded for Constant or Paarameter Variables |
Spatial Grain Size
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Not recorded for Constant or Parameter Variables |
Spatial Density
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Not recorded for Constant or Parameter Variables |
EnviroAtlas URL
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Variable Temporal Characteristics
Decay rate (maximum) ?Comment:Constant value determined by the class variable; Contaminant. The maximum daily decay rate constant (fraction per day) of a specified contaminant. The Comptox library (https://comptox.epa.gov/#/) lists the half-life for most organic contaminants, from which the daily maximum decay rate constant can be calculated and specified for this parameter. Users can enter the specified half-life value into an online calculator to calculate the decay constant. For example, see https://www.calculator.net/half-life-calculator.html?type=2&chalflife=4&cmeanlifetime=&cdecayconstant=&x=35&y=16. Note that decomposed contaminant amounts are not tracked by the simulation and not reported in its results. This is because contaminants almost always make up an insignificant fraction of the total amount of organic matter within soils. |
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Temporal Extent
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Not recorded for Constant or Parameter Variables |
Temporally Distributed?
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Not recorded for Constant or Parameter Variables |
Regular Temporal Grain?
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Not recorded for Constant or Parameter Variables |
Temporal Grain Size Value
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Not recorded for Constant or Parameter Variables |
Temporal Grain Size Units
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Not recorded for Constant or Parameter Variables |
Temporal Density
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Not recorded for Constant or Parameter Variables |
Variable Values
Decay rate (maximum) ?Comment:Constant value determined by the class variable; Contaminant. The maximum daily decay rate constant (fraction per day) of a specified contaminant. The Comptox library (https://comptox.epa.gov/#/) lists the half-life for most organic contaminants, from which the daily maximum decay rate constant can be calculated and specified for this parameter. Users can enter the specified half-life value into an online calculator to calculate the decay constant. For example, see https://www.calculator.net/half-life-calculator.html?type=2&chalflife=4&cmeanlifetime=&cdecayconstant=&x=35&y=16. Note that decomposed contaminant amounts are not tracked by the simulation and not reported in its results. This is because contaminants almost always make up an insignificant fraction of the total amount of organic matter within soils. |
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Not applicable | |
Min Value
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Not applicable |
Max Value
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Not applicable |
Other Value Type
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Not applicable |
Other Value
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Not applicable |
Variable Variability and Sensitivity
Decay rate (maximum) ?Comment:Constant value determined by the class variable; Contaminant. The maximum daily decay rate constant (fraction per day) of a specified contaminant. The Comptox library (https://comptox.epa.gov/#/) lists the half-life for most organic contaminants, from which the daily maximum decay rate constant can be calculated and specified for this parameter. Users can enter the specified half-life value into an online calculator to calculate the decay constant. For example, see https://www.calculator.net/half-life-calculator.html?type=2&chalflife=4&cmeanlifetime=&cdecayconstant=&x=35&y=16. Note that decomposed contaminant amounts are not tracked by the simulation and not reported in its results. This is because contaminants almost always make up an insignificant fraction of the total amount of organic matter within soils. |
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Variability Expression Given?
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Not recorded for Constant or Parameter Variables |
Variability Metric
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None |
Variability Value
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None |
Variability Units
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None |
Resampling Used?
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Not recorded for Constant or Parameter Variables |
Variability Expression Used in Modeling?
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Not recorded for Constant or Parameter Variables |
Variable Operational Validation (Response Variables only)
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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