3.3 Output fields conditioning

   
3.3.1 Horizontal representation of dynamic fields

For any post-processed dynamic field it is possible to choose the horizontal representation (spectral or gridpoint), providing the field can be computed in both representation. This is independant from the representation of the field in the model. So it is a way to convert fields from spectral space to gridpoint space or vice-versa) :

   

TFP_{*}%LLGP

:

Definition

: Horizontal representation of fields : .TRUE. for gridpoint, .FALSE. for spectral.

Scope

: Boolean. "{*}" represents the field generic identificator (there is one variable per dynamic field).

Default value

: Refer to appendix A.1 for upper air fields, and to appendix A.1.1 for 2D fields.

Namelist location

: NAMAFN

       

LFITS

:

Definition

: Spectral fit of post-processed fields on eta levels. This key is active only if CFPFMT='MODEL' (ie : spectral coefficients in output). Setting LFITS=.FALSE. enables to write out all upper air dynamic fields in gridpoints.

Scope

: Boolean. This key is getting obsolescent.
Better use the individual keys TFP_{*}%LLGP.

Default value

: .TRUE.

Namelist location

: NAMFPC

3.3.2 Encoding data in output file

   

NBITPG

:

Definition

: Default number of bits for packing fields.

Scope

: Integer which value can be either -1, or any positive number between 1 and 64. If NBITPG=-1 then the default value is internally computed by the FA (File ARPEGE) software.

Default value

: 24 ; if NBITPG=-1 the actual default value will be 16.

Namelist location

: NAMFA

   

NSTRON

:

Definition

: Default threshold for the truncation beyond which the spectral fields are packed.

Scope

: Integer which value can be either -1, or any positive number between 1 and the model truncation NSMAX.

Default value

: 10 ; if NSTRON=-1 the actual default depends on the model truncation NSMAX.

Namelist location

: NAMFA

   

NPULAP

:

Definition

: "Dolby exposant" for the packing of spectral fields.

Scope

: Integer between -5 and +5.

Default value

: 1

Namelist location

: NAMFA

   

NB{*}

:

Definition

: Number of bits for packing physical fields and fluxes.

Scope

: Integer. "{*}" represents the field generic identificator (there is one variable per field)

Default value

: Refer to appendix A.1.2. Notice : surface geopotential should not be packed in the model in order to keep consistency between spectral and gridpoint orography.

Namelist location

: NAMAFN

   

TFP_{*}%IBITS

:

Definition

: Number of bits for packing dynamic fields.

Scope

: Integer. "{*}" represents the field generic identificator (there is one variable per dynamic field)

Default value

: Refer to appendix A.1 for upper air fields, and to appendix A.1.1 for 2D fields. Notice : surface geopotential should not be packed in the model in order to keep consistency between spectral and gridpoint orography.

Namelist location

: NAMAFN

   

NFPGRIB

:

Definition

: GRIB level for fields encoding in the post-processing ARPEGE/ALADIN files :

• NFPGRIB=0 : no packing at all. This value has priority over the numbers of bits for packing.
• NFPGRIB=1 : standard GRIB encoding.
• NFPGRIB=2 : a modified GRIB encoding for ARPEGE/ALADIN files.

Refer to the documentation on the ARPEGE/ALADIN files for more information (available in french or in english).

Scope

: Integer between 0 and 2.

Default value

: 2

Namelist location

: NAMFPC

3.3.3 Customized complexions

   

NCADFORM

:

Definition

: Auto-documentation format for the ALADIN files : set NCADFORM=0 for the EGGX new style format and NCADFORM=1 for the EGGX old style format.

Scope

: Integer which value can be only 0 or 1.

Default value

: 0

Namelist location

: NAMOPH

     

LFPRH100

:

Definition

: Representation of relative humidity : set LFPRH100=.TRUE. to get a percentage rather than a ratio.

Scope

: Boolean.

Default value

: LFPRH100=LECMWF

Namelist location

: NAMFPC

           

LFPLOSP

:

Definition

: Representation of surface pressure : set LFPLOSP=.TRUE. to fill surface pressure with its logarithm.

Scope

: Boolean.

Default value

: if LECMWF=.TRUE. then LFPLOSP=.FALSE. ; else LFPLOSP=.FALSE. except for the so-called configurations ((e)e)927 (See chapter 4).

Namelist location

: NAMFPC