2.1 Getting started

2.1.1 Installing the software

FullPOS is embedded in the software ARPEGE/IFS/ALADIN. It needs the auxilary library for the I/Os and some low-level calculations, and the external spectral transforms packages TFL and TAL (the last one is needed for running FullPOS ALADIN only).

2.1.2 Preparing the namelists file

The namelists file should correspond to the ARPEGE/IFS/ALADIN cycle you are running.
FullPOS is using a few specific namelists which are :   NAMAFN,   NAMFPC,   NAMFPD,   NAMFPG,   NAMFPF,   NAMFPIOS,   NAMFPSC2,   NAMFPEZO   and NAMCAPE.
All these namelists are specific to FullPOS , except NAMAFN which is a little bit more general.
FullPOS is also using model variables from the namelists   NAMCT0,   NAMDIM,   NAMDYN,   NAMPAR0,   NAMPAR1,   NAMOPH,   NAMFA   and NAMCT1.
Furthermore it is indirectly interfaced with the model via the namelists NAMPHY, NAMDPHY, NAMINI, NAMCFU and NAMXFU.

2.1.3 Running the software

To run the software anyhow, you have to control that the next basic namelist variables are properly set :

   

NCONF

:

Definition

: General configuration of the ARPEGE/IFS/ALADIN software. This parameter is also accessible as a command line option : -c

Scope

: Integer which must be 1 to enable the post-processing.

Default value

: in namelist the default value is 1 ; if the command line option is used there is no default value.

Namelist location

: NAMCT0

   

CNMEXP

:

Definition

: Name of the experiment. This parameter is also accessible as a command line option : -e

Scope

: string of 4 characters.

Default value

: in namelist the default value is '0123' ; if the command line option is used there is no default value.

Namelist location

: NAMCT0

   

LECMWF

:

Definition

: Control of setup version. (Set .TRUE. for ECMWF setup and .FALSE. for METEO-FRANCE setup). This parameter is also accessible as a command line option : -v

Scope

: in namelist : boolean ; in command line : character string which can be either 'ecmwf' (for LECMWF=.TRUE.) or 'meteo' (for LECMWF=.FALSE.).

Default value

: in namelist the default value is .TRUE. ; if the command line option is used there is no default v alue.

Namelist location

: NAMCT0

   

LELAM

:

Definition

: Control of the limited area vs. global version of the model. (Set .TRUE. for ALADIN and .FALSE. for ARPEGE/IFS). This parameter is also accessible as a command line option : -m

Scope

: in namelist : boolean ; in command line : character string which can be either 'arpifs' (for LELAM=.FALSE.) or 'aladin' (forLELAM=.TRUE.).

Default value

: in namelist the default value is .FALSE. ; if the command line option is used the default value is 'arpifs'.

Namelist location

: NAMCT0

   

LFPOS

:

Definition

: Main control of FullPOS software ; set LFPOS=.TRUE. to activate it.

Scope

: Boolean.

Default value

: .FALSE.

Namelist location

: NAMCT0

   

N1POS

:

Definition

: Post-processing outputs control switch. Set N1POS=1 to switch on, and N1POS=0 to switch off.

Scope

: Integer between 0 and 1.

Default value

: 1

Namelist location

: NAMCT1

           

NFRPOS, NPOSTS

:

Definition

: Post-processing outputs monitor, working as follows :

• if NPOSTS(0) = 0 then the post-processing runs every NFRPOS time steps (including time 0).
• if NPOSTS(0) > 0 then NPOSTS(0) is the number of post-processing events and the post-processing runs on the time steps NPOSTS(1)*NFRPOS, NPOSTS(2)*NFRPOS, ...NPOSTS(NPOSTS(0))*NFRPOS.
• if NPOSTS(0) < 0 then -NPOSTS(0) is the number of post-processing events and the post-processing runs on the hours -NPOSTS(1)*NFRPOS, -NPOSTS(2)*NFRPOS, ...-NPOSTS(NPOSTS(0))*NFRPOS.

Scope

: Respectively positive integer, and integer array sized 0 to 240.

Default value

: If LECMWF=.FALSE. and NCONF=1 and the command line is used then NFRPOS=1 and NPOSTS is set for output at hours 0, 6, 12, 18, 24, 30, 36, 48, 60 and 72. Else NFRPOS=NSTOP and NPOSTS(:)=0 (outputs at first and last time step).

Namelist location

: NAMCT0

If you do not specify anything else, then FullPOS will run, but you will not get any output file since you did not ask for any output field !

Imagine now that you add in the namelist NAMFPC the following variables :
CFP3DF='GEOPOTENTIEL','TEMPERATURE',
RFP3F=50000.,85000.,
then you will get a post-processing file which will contain the geopotential and the temperature at 500 hPa and 850 hPa on the model grid (stretched gaussian grid in the case of ARPEGE, geographical "C+I" grid in the case of ALADIN. The output file will be a file ARPEGE/ALADIN named PF${CNMEXP}000+nnnn, where ${CNMEXP} is the name of the experiment (CNMEXP(1:4)), and nnnn the forecast range.