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The FLEXPART grib files has their own local section (Section 2) containing additional information about the given field and the FLEXPART simulation itself. The snapshot below taken from Metview's grib examiner shows the currently defined set of keys in Section 2.
Concentration
Concentration fields are only produced for forward simulations when Output Field Type is set to conc or both in FLEXPART Run.
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Options in FLEXPART Run | Description | GRIB shortname | GRIB paramId | GRIB units | Contouring units |
|---|---|---|---|---|---|
| receptor_units=mass | mass concentration | conc | 20001 | kg m**-3 | ng m**-3 |
| receptor_units=mixr | mass mixing ratio | mxrm | 20002 | kg kg**-1 | ppt (mass) |
Volume mixing ratio
Volume mixing ratio fields are only produced for forward simulations when Output Field Type is set to mixr or both in FLEXPART Run.
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| Description | GRIB shortname | GRIB paramId | GRIB units | Contouring units |
|---|---|---|---|---|
| volume mixing ratio | mxrv | 20052 | mol mol**-1 | ppt (volume) |
Dry and wet deposition
These fields are only produced for forward simulations when Output Field Type is set to conc, mixr or both in FLEXPART Run. They are always inserted into the concentration or/and volume mixing ratio files.
| Description | GRIB shortname | GRIB paramId | GRIB units | Contouring units |
|---|---|---|---|---|
| dry deposition | fdd | 20197 | kg m**-2 | ng m**-2 |
| wet deposition | fwd | 20198 | kg m**-2 | ng m**-2 |
Response time
Fluxes
These fields are only produced for forward simulations when Output Flux is set to on in FLEXPART Run. The output filename is: flux_sSSS.grib where SSS is the species number (with leading zeros).
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