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Gridded outputs are converted to grib using local grib definitions built into Metview.
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Please note that Metview scales the values for contour plots of gridded FLEXPART data. This scaling is only enabled when the Grid Scaling For Retrieved Fields parameter is set to on (this is the default value) in the Contouring icon. See the "Contouring units" column the tables below to find out how the scaling works for a given parameter. |
FLEXPART grib files have 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.
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To plot a particular parameter and level we need to filter the desired fields from the resulting FLEXPART output GRIB file. Unfortunately, Metview's Grib Filter icon cannot handle these files (partly due to the local GRIB definition they use) so we need to use Macro with a set of functions dedicated to FLEXPART to deal with this problems. See Using FLEXPART with Metview for details. |
Concentration fields
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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conc_sSSS.grib
where SSS is the species number index (starts from 1) with leading zeros). The actual field type and units are based on the Receptor Units settings in the FLEXPART Run icon.
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 fields
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pptv_sSSS.grib
where SSS is the species number index (starts from 1) with leading zeros).
| Description | GRIB shortname | GRIB paramId | GRIB unitsContouring units | |
|---|---|---|---|---|
| volume mixing ratio | mxrv | 20052 | mol mol**-1 | ppt (volume) |
Dry and wet deposition fields
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| 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 |
Flux fields
These fields are only produced when Output Flux is set to on in FLEXPART Run. The output filename is:
flux_sSSS.grib
where SSS is the species number index (starts from 1) with leading zeros).
| Description | GRIB shortname | GRIB paramId | GRIB units | Contouring units |
|---|---|---|---|---|
| eastward flux | feflux | 20199 | kg m**-2 s**-1ng m**-2 s**-1 | |
| westward flux | fwflux | 20200 | kg m**-2 s**-1ng m**-2 s**-1 | |
| southward flux | fnflux | 20201 | kg m**-2 s**-1ng m**-2 s**-1 | |
| northward flux | fsflux | 20202 | kg m**-2 s**-1 | ng m**-2 s**-1 |
| upward flux | fuflux | 20203 | kg m**-2 s**-1 | ng m**-2 s**-1 |
| downward flux | fdflux | 20204 | kg m**-2 s**-1 | ng m**-2 s**-1 |
Residence time/response fields
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time_sSSS.grib
where SSS is the species number index (starts from one) with leading zeros).
Plume trajectories
Trajectories are produced when Output Trajectory is set to on in FLEXPART Run. The ASCII file generated by FLEXPART is split according to releases and converted into another (CSV) format that is better suited to metview. The output filenames are:
tr_rRRR.csv
where R is the release number (starts from one) with leading zeros. The first row in the trajectory file contains metadata as a set of key value pairs, while the the second row contains the header.
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