Block ENSEMBLE

This block is used by task SetEns to generate the ensemble members

1. RANDOM_NUMBERS_FROM_FILE = (options)
   • Indicate whether the ensemble should be reconstructed
   • Input options:
     • YES: Read ensemble perturbations from *.ens files
     • NO: Reconstruct the ensemble and generate new *.ens files
   • Note: If *.ens are not found, option RANDOM_NUMBERS_FROM_FILE = NO will be used
2. PERTURBATE_COLUMN_HEIGHT = (options)
   • Perturbate eruption column height
   • Input options:
     • NO: Disable perturbation
     • RELATIVE: Perturbation range given as a fraction of the central value
     • ABSOLUTE: Perturbation range given as an absolute value
3. PERTURBATE_MASS_FLOW_RATE = (options)
   • Perturbate mass eruption rate
   • Input options:
     • NO: Disable perturbation
     • RELATIVE: Perturbation range given as a fraction of the central value
     • ABSOLUTE: Perturbation range given as an absolute value
   • Note: This option is deactivated for SOURCE_TYPE=PLUME or MASS_FLOW_RATE_(KGS)=ESTIMATE-* options
4. PERTURBATE_SOURCE_START = (options)
   • Perturbate the starting time of each eruptive phase
   • Input options:
     • NO: Disable perturbation
     • RELATIVE: Perturbation range given as a fraction of the central value
     • ABSOLUTE: Perturbation range given as an absolute value
5. PERTURBATE_SOURCE_DURATION = (options)
   • Perturbate the duration time of each eruptive phase
   • Input options:
     • NO: Disable perturbation
     • RELATIVE: Perturbation range given as a fraction of the central value
     • ABSOLUTE: Perturbation range given as an absolute value
6. PERTURBATE_TOP-HAT_THICKNESS = (options)
   • Perturbate the top-hat thickness
   • Input options:
     • NO: Disable perturbation
     • RELATIVE: Perturbation range given as a fraction of the central value
     • ABSOLUTE: Perturbation range given as an absolute value
   • Note: Only used if SOURCE_TYPE = TOP-HAT
7. PERTURBATE_SUZUKI_A = (options)
   • Perturbate the Suzuki coefficient A
   • Input options:
     • NO: Disable perturbation
     • RELATIVE: Perturbation range given as a fraction of the central value
     • ABSOLUTE: Perturbation range given as an absolute value
   • Note: Only used if SOURCE_TYPE = SUZUKI
8. PERTURBATE_SUZUKI_L = (options)
   • Perturbate the Suzuki coefficient L
   • Input options:
     • NO: Disable perturbation
     • RELATIVE: Perturbation range given as a fraction of the central value
     • ABSOLUTE: Perturbation range given as an absolute value
   • Note: Only used if SOURCE_TYPE = SUZUKI
9. PERTURBATE_WIND = (options)
   • Perturbate the horizontal wind components
   • Input options:
     • NO: Disable perturbation
     • RELATIVE: Perturbation range given as a fraction of the central value
     • ABSOLUTE: Perturbation range given as an absolute value
   • Note: Zonal and meridional wind components are independently perturbed (two random numbers are generated)
10. PERTURBATE_DATA_INSERTION_CLOUD_HEIGHT = (options)
    • Perturbate the cloud insertion height
    • Input options:
      • NO: Disable perturbation
      • RELATIVE: Perturbation range given as a fraction of the central value
      • ABSOLUTE: Perturbation range given as an absolute value
    • Note: Only used if INITIAL_CONDITION = INSERTION
11. PERTURBATE_DATA_INSERTION_CLOUD_THICKNESS = (options)
    • Perturbate the cloud insertion thickness
    • Input options:
      • NO: Disable perturbation
      • RELATIVE: Perturbation range given as a fraction of the central value
      • ABSOLUTE: Perturbation range given as an absolute value
    • Note: Only used if INITIAL_CONDITION = INSERTION
12. PERTURBATE_FI_MEAN = (options)
    • Perturbate the mean of the TGSD
    • Input options:
      • NO: Disable perturbation
      • RELATIVE: Perturbation range given as a fraction of the central value
      • ABSOLUTE: Perturbation range given as an absolute value
    • Note: For bimodal distributions BIGAUSSIAN and ESTIMATE, only the fine subpopulation is perturbed
13. PERTURBATE_DIAMETER_AGGREGATES_(MIC) = (options)
    • Perturbate the diameter of the particle aggregates
    • Input options:
      • NO: Disable perturbation
      • RELATIVE: Perturbation range given as a fraction of the central value
      • ABSOLUTE: Perturbation range given as an absolute value
    • Note: Only used if AGGREGATION_MODEL != NONE
14. PERTURBATE_DENSITY_AGGREGATES = (options)
    • Perturbate the density of the particle aggregates
    • Input options:
      • NO: Disable perturbation
      • RELATIVE: Perturbation range given as a fraction of the central value
      • ABSOLUTE: Perturbation range given as an absolute value
    • Note: Only used if AGGREGATION_MODEL != NONE

Sub-block IF_PERTURBATE_COLUMN_HEIGHT

Used when PERTURBATE_COLUMN_HEIGHT != NO

1. PERTURBATION_RANGE = (float)
   • Define the perturbation range in meters (PERTURBATE_COLUMN_HEIGHT = ABSOLUTE) or percent (PERTURBATE_COLUMN_HEIGHT = RELATIVE)
2. PDF = (options)
   • Define the sampling Probability Density Function (PDF)
   • Input options:
     • UNIFORM: Uniform (constant) PDF
     • GAUSSIAN: Gaussian PDF centred at the reference value

Sub-block IF_PERTURBATE_MASS_FLOW_RATE

Used when PERTURBATE_MASS_FLOW_RATE != NO

1. PERTURBATION_RANGE = (float)
   • Define the perturbation range in kg/s (PERTURBATE_MASS_FLOW_RATE = ABSOLUTE) or percent (PERTURBATE_MASS_FLOW_RATE = RELATIVE)
2. PDF = (options)
   • Define the sampling Probability Density Function (PDF)
   • Input options:
     • UNIFORM: Uniform (constant) PDF
     • GAUSSIAN: Gaussian PDF centred at the reference value

Sub-block IF_PERTURBATE_SOURCE_START

Used when PERTURBATE_SOURCE_START != NO

1. PERTURBATION_RANGE = (float)
   • Define the perturbation range in s (PERTURBATE_SOURCE_START = ABSOLUTE) or percent (PERTURBATE_SOURCE_START = RELATIVE)
2. PDF = (options)
   • Define the sampling Probability Density Function (PDF)
   • Input options:
     • UNIFORM: Uniform (constant) PDF
     • GAUSSIAN: Gaussian PDF centred at the reference value

Sub-block IF_PERTURBATE_SOURCE_DURATION

Used when PERTURBATE_SOURCE_DURATION != NO

1. PERTURBATION_RANGE = (float)
   • Define the perturbation range in s (PERTURBATE_SOURCE_DURATION = ABSOLUTE) or percent (PERTURBATE_SOURCE_DURATION = RELATIVE)
2. PDF = (options)
   • Define the sampling Probability Density Function (PDF)
   • Input options:
     • UNIFORM: Uniform (constant) PDF
     • GAUSSIAN: Gaussian PDF centred at the reference value

Sub-block IF_PERTURBATE_TOP-HAT_THICKNESS

Used when PERTURBATE_TOP-HAT_THICKNESS != NO

1. PERTURBATION_RANGE = (float)
   • Define the perturbation range in meters (PERTURBATE_TOP-HAT_THICKNESS = ABSOLUTE) or percent (PERTURBATE_TOP-HAT_THICKNESS = RELATIVE)
2. PDF = (options)
   • Define the sampling Probability Density Function (PDF)
   • Input options:
     • UNIFORM: Uniform (constant) PDF
     • GAUSSIAN: Gaussian PDF centred at the reference value

Sub-block IF_PERTURBATE_SUZUKI_A

Used when PERTURBATE_SUZUKI_A != NO

1. PERTURBATION_RANGE = (float)
   • Define the perturbation range of the dimensionless parameter A in absolute units (IF_PERTURBATE_SUZUKI_A = ABSOLUTE) or percent (IF_PERTURBATE_SUZUKI_A = RELATIVE)
2. PDF = (options)
   • Define the sampling Probability Density Function (PDF)
   • Input options:
     • UNIFORM: Uniform (constant) PDF
     • GAUSSIAN: Gaussian PDF centred at the reference value

Sub-block IF_PERTURBATE_SUZUKI_L

Used when PERTURBATE_SUZUKI_L != NO

1. PERTURBATION_RANGE = (float)
   • Define the perturbation range of the dimensionless parameter L in absolute units (IF_PERTURBATE_SUZUKI_L = ABSOLUTE) or percent (IF_PERTURBATE_SUZUKI_L = RELATIVE)
2. PDF = (options)
   • Define the sampling Probability Density Function (PDF)
   • Input options:
     • UNIFORM: Uniform (constant) PDF
     • GAUSSIAN: Gaussian PDF centred at the reference value

Sub-block IF_PERTURBATE_WIND

Used when PERTURBATE_WIND != NO

1. PERTURBATION_RANGE = (float)
   • Define the perturbation range in m/s (PERTURBATE_WIND = ABSOLUTE) or percent (PERTURBATE_WIND = RELATIVE)
2. PDF = (options)
   • Define the sampling Probability Density Function (PDF)
   • Input options:
     • UNIFORM: Uniform (constant) PDF
     • GAUSSIAN: Gaussian PDF centred at the reference value

Sub-block IF_PERTURBATE_DATA_INSERTION_CLOUD_HEIGHT

Used when PERTURBATE_DATA_INSERTION_CLOUD_HEIGHT != NO

1. PERTURBATION_RANGE = (float)
   • Define the perturbation range in meters (IF_PERTURBATE_DATA_INSERTION_CLOUD_HEIGHT = ABSOLUTE) or percent (IF_PERTURBATE_DATA_INSERTION_CLOUD_HEIGHT = RELATIVE)
2. PDF = (options)
   • Define the sampling Probability Density Function (PDF)
   • Input options:
     • UNIFORM: Uniform (constant) PDF
     • GAUSSIAN: Gaussian PDF centred at the reference value

Sub-block IF_PERTURBATE_DATA_INSERTION_CLOUD_THICKNESS

Used when PERTURBATE_DATA_INSERTION_CLOUD_THICKNESS != NO

1. PERTURBATION_RANGE = (float)
   • Define the perturbation range in meters (PERTURBATE_DATA_INSERTION_CLOUD_THICKNESS = ABSOLUTE) or percent (PERTURBATE_DATA_INSERTION_CLOUD_THICKNESS = RELATIVE)
2. PDF = (options)
   • Define the sampling Probability Density Function (PDF)
   • Input options:
     • UNIFORM: Uniform (constant) PDF
     • GAUSSIAN: Gaussian PDF centred at the reference value

Sub-block IF_PERTURBATE_FI_MEAN

Used when PERTURBATE_FI_MEAN != NO

1. PERTURBATION_RANGE = (float)
   • Define the perturbation range in phi units (PERTURBATE_FI_MEAN = ABSOLUTE) or percent (PERTURBATE_FI_MEAN = RELATIVE)
2. PDF = (options)
   • Define the sampling Probability Density Function (PDF)
   • Input options:
     • UNIFORM: Uniform (constant) PDF
     • GAUSSIAN: Gaussian PDF centred at the reference value

Sub-block IF_PERTURBATE_DIAMETER_AGGREGATES_(MIC)

Used when PERTURBATE_DIAMETER_AGGREGATES_(MIC) != NO

1. PERTURBATION_RANGE = (float)
   • Define the perturbation range in microns (PERTURBATE_DIAMETER_AGGREGATES_(MIC) = ABSOLUTE) or percent (PERTURBATE_DIAMETER_AGGREGATES_(MIC) = RELATIVE)
2. PDF = (options)
   • Define the sampling Probability Density Function (PDF)
   • Input options:
     • UNIFORM: Uniform (constant) PDF
     • GAUSSIAN: Gaussian PDF centred at the reference value

Sub-block IF_PERTURBATE_DENSITY_AGGREGATES

Used when PERTURBATE_DENSITY_AGGREGATES != NO

1. PERTURBATION_RANGE = (float)
   • Define the perturbation range in kg/m3 (PERTURBATE_DENSITY_AGGREGATES = ABSOLUTE) or percent (PERTURBATE_DENSITY_AGGREGATES = RELATIVE)
2. PDF = (options)
   • Define the sampling Probability Density Function (PDF)
   • Input options:
     • UNIFORM: Uniform (constant) PDF
     • GAUSSIAN: Gaussian PDF centred at the reference value