This icon runs the FLEXPART Lagrangian particle dispersion model and converts its outputs to formats Metview can work with. For help on editing icons, please see Editing Icons.

The macro language equivalent is flexpart_run().

The FLEXPART Run Editor

All the date parameters used for FLEXPART Run have yyyymmdd format. Relative dates are allowed: e.g. -1 means yesterday, 0 means today, etc.                   

Output Path

Specifies the location of the output data files. Both an absolute and relative path can be given 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 preference 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 the path specified here 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

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 Rate

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 1 (hour).

Output Field Type

Specifies the type of the gridded output fields. The possible values are:

The default value is conc. 

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. 

Output Trajectory

Specifies if the plume trajectories should be computed (on or off). The default value is off.

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.  

Release Species

Specifies the list of the species released for the simulation. At all release locations the same species are emitted. The species are identified by the NNN number appearing in the the name of the SPECIES_NNN files. These files contain the physical and chemical properties of species.  

Release Units

Specifies the concentration units of the released species. The possible options are mass (mass concentration) and mixr (mass mixing ratio). The default value is mass. 

Releases

Specifies the releases as a group of FLEXPART Release icons. 

Receptor units

Specifies the concentration units at the receptor. For forward simulations this the units of the output concentrations. For backward simulations ????? The possible options are mass (mass concentrations) and mixr (mass mixing ratio). The default value is mass. 

Receptors

Enables the usage of receptor sites for forward simulations (on or off). When it is enabled the list of receptor sites can be defined via Receptor Names, Receptor Latitudes and Receptor Longitude. The default value is off.

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.

Receptors 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 Constant

Specifies the time constant for particle splitting in format. Particles are split into two after every N seconds given here. If -1 is given here particle splitting is not used. The default value is -1 (no splitting).

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 -4.

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

Specified whether output should be generated for each release separately (on or off). For backward simulations it must be set to off. 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:

The default value is none.

Dump Particle Position

Enables dumping the particle positions. The possible values are none, output (at every output time) and end (only at the end of the simulation). The default value is none.

Sensitivity

Enables computing sensitivity to initial conditions in backward simulations. The possible values are none, mass (mass concentration units) or mixr (mass mixing ratio units). The default value is none.