This icon runs the FLEXPART Lagrangian particle dispersion model and converts its outputs to formats that Metview can work with. For help on editing icons, please see Editing Icons.
The macro language equivalent is flexpart_run().
The FLEXPART Run Editor
Output Path
Specifies the location of the output data files. Both an absolute and relative path can be given here. Please note that Metview converts FLEXPART output into other formats and only these converted results are copied from the work directory into Output Path. For further details about the output formats click here.
Input Data
Specifies the location of the input data files and the AVAILABLE file using a FLEXPART Prepare icon. Please note that if an icon is set here it takes precedence over the path specified in Input Path.
Input Path
Specifies the location of the input data files and the AVAILABLE file. Both an absolute and relative path can be given here. Please note that when an icon is specified in Input Data this path is ignored.
User Exe Path
Specifies a user defined FLEXPART executable. Both absolute and relative path can be given here. If it is left blank (this is the default) Metview will use the MV_FLEXPART_EXE environment variable to locate the executable.
User Resources Path
Specifies the location of the user defined parameter files (IGBP_int1.dat, OH_7lev_agl.dat, surfdata.t, surfdepo.t ) needed to run FLEXPART. Both an absolute and relative path can be given here. If it is left blank (this is the default) Metview will use the MV_FLEXPART_RESOURCES environment variable to locate the resources. For further details about the resources click here.
Simulation Direction
Specifies the FLEXPART simulation direction in time. The possible values are: Forward and Backward. The default value is Forward.
Starting Date
Specifies the beginning date of the simulation in YYYYMMDD format. Relative dates are allowed: e.g. -1 means yesterday, 0 means today, etc.
Starting Time
Specifies the beginning time of the simulation in HH[:MM[:SS]] format.
Ending Date
Specifies the ending date of the simulation in YYYYMMDD format. Relative dates are allowed: e.g. -1 means yesterday, 0 means today, etc.
Ending Time
Specifies the ending time of the simulation in HH[:MM[:SS]] format.
Output Interval
Specifies the frequency for the output generation. The output is averaged over the period given in Output Averaging Interval. The format is HHHH[:MM[:SS]]. The default value is 3 (hours).
Output Averaging Interval
Specifies the averaging interval for the output generation in HHHH[:MM[:SS]] format. If 0 is given here instantaneous values are written into the output files. The default value is 3 (hours).
Output Sampling Rate
Specifies the sampling rate used for the averaging of the output. This period must be shorter than the Output Averaging Interval. The format is HHHH[:MM[:SS]]. The default value is 0:15 (15 minutes).
Output Field Type
Specifies the type of the gridded output fields. The possible values are:
for forward simulations:
- none (no gridded output)
- conc (concentration)
- mixr (mass mixing ratio)
- both (concentration and mass mixing ratio)
for backward simulations:
- none (no gridded output)
- rtime (residence time/response function)
The default value is conc. For more details about gridded output click here.
Output Flux
Specifies if the fluxes should be computed and written out as a gridded output (on or off). Fluxes corresponding to northward, southward, eastward, westward, upward and downward directions are calculated for each grid cell of the output grid.The control surfaces are placed in the middle of each output grid cell. The default value is off. For more details about flux output click here.
Output Trajectory
Specifies if the plume trajectories should be computed (on or off). The default value is off. For more details about trajectory output click here.
Output Area
Specifies the area for the gridded output in degrees in S/W/N/E format. The default value is -90/-180/90/180.
Output Grid
Specifies the grid resolution for the gridded output in degrees as east_west_resolution/north_south_resolution. The default value is 1/1.
Output Levels
Specifies the list of height levels of the gridded output. The levels are given in metres units. The default value is an empty list.
User Species Path
Specifies the location of the user defined species files. Both an absolute and relative path can be given here. If it is left blank (this is the default value) Metview will use the MV_FLEXPART_SPECIES environment variable to locate the species. For more details about the species click here.
Release Species
Specifies the list of the species released for the simulation. At all the release locations the same species are emitted. The species are identified by the NNN number (with leading zeros) appearing in the the name of the SPECIES_NNN files. These files contain the physical and chemical properties of species. For more details about the species click here.
Release Units
Specifies the units of the mass of the released species. The possible options are mass and mixr. The default value is mass. See the table below to find out what the actual units mean.
for forward simulations:
| Release Units | Receptor Units | ||
|---|---|---|---|
| keyword | units | keyword | units in concentration fields |
| mass | kg | mass | kg m**-3 |
| mass | kg | mixr | kg kg**-1 |
| mixr | 1 | mass | kg m**-3 |
| mixr | 1 | mixr | kg kg**-1 |
for backward simulations:
| Release Units | Receptor Units | ||
|---|---|---|---|
| keyword | units | keyword | units in residence time fields |
| mass | 1 | mass | s |
| mass | 1 | mixr | s m**3 kg**-1 |
| mixr | 1 | mass | s kg m**-3 |
| mixr | 1 | mixr | s |
Releases
Specifies the releases as a group of FLEXPART Release icons.
Receptor units
Specifies the concentration units at the receptor. The possible options are mass (mass concentrations) and mixr (mass mixing ratio). The default value is mass. See the table above to find out what the actual units mean.
Receptors
Enables the usage of receptor sites (on or off). When it is enabled the list of receptor sites can be defined via Receptor Names, Receptor Latitudes and Receptor Longitudes. The default value is off. For more details about receptor output click here.
Receptor Names
Specifies the list of receptor site names.The default value is an empty list.
Receptor Latitudes
Specifies the list of receptor site latitudes. The default value is an empty list.
Receptor Longitudes
Specifies the list of receptor site longitudes. The default value is an empty list.
Age Classes
Specifies the list of times for the age class calculation. If it is left blank (this is the default value) no age class is defined.
Particle Splitting
Specifies the interval for particle splitting in HHHH[:MM[:SS]] format. Each particle is split into two after travelling the multiple of this interval. If 0 (default value) is given here particle splitting is disabled.
Sync Interval
All processes are synchronized with this time interval, therefore, all other time constants must be multiples of this value. Output interval and Output Averaging Interval must be at least twice of this value. The default value is 900.
Ctl
Specifies the factor by which the time step must be smaller than the Lagrangian time scale (TL). CTL must be >1 for time steps shorter than the Lagrangian time scale. If CTL<0, a purely random walk simulation is done. The default value -5.
Vertical Timestep Reduction
Specifies the reduction factor (as an integer) for the time step used for vertical wind. The default value is 4.
Subgrid Terrain
Enables subgridscale terrain parametrization (increase of mixing heights due to subgridscale orographic variations) (on or off). The default value is off.
Convection
Enables convection parametrization (on or off). The default value is off.
Output For Each Release
Specifies whether a separate output fields should be generated for each release (on or off). When this option is set to off for forward simulations the output fields for a given species contain the sum of all the releases. For backward simulations it must be set to on. The default value is off.
Quasi Lagrangian
Specifies whether particles should be numbered individually (on) or identified by the release location number (off). The default value is off.
Domain Fill
Enables the domain fill mode. The possible values are as follows:
- no: domain fill is disabled
- full: in this mode the the particles are not released at specific locations but the 3D-volume of the first release is taken and the particles are uniformly distributed in the volume proportionally to air density. Each particle will receive the same mass, altogether accounting for the total atmospheric mass. Subsequently, particles can move freely in the atmosphere.
- o3_tracer: in this mode domain-filling is to simulate a stratospheric ozone tracer. This option is similar to fill option, but only particles in the stratosphere (defined by PV < 2 pvu) are released.
The default value is no.
Sensitivity
Enables computing sensitivity to initial conditions in backward simulations. The possible values are no, mass (mass concentration units) or mixr (mass mixing ratio units). The default value is none.