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Initial conditions for the standard OpenIFS model can be generated using the OpenIFS Data Hub or alternatively they can be requested from the ECMWF OpenIFS support by email openifs-support@ecmwf.int. This provides initial experiment data and surface boundary conditions for the physical/meteorological NWP forecast model. In order to simulate atmospheric composition further initial and boundary conditions are needed. These can be created using the prep-ic-icmcl-compo.sh script. 

You need to edit variables inside the file config.h to correspond with the chosen settings for your experiment before running the script to generate the initial data.

At first to set the following environment variables need to be set to the appropriate locations. In our example above in Section 2.3 these locations can be found under /data/openifs-ac: 

OIFS_ICMCL_DIR  – 
This points to a directory containing initial conditions for the first day of all months of the year 2010. The ICMCL files contain boundary conditions (e.g. SSTs) for the entire month. 

OIFS_INIDATA_DIR_TM5  – 
Points to a directory containing 'tm5' chemistry scheme initial conditions (with or without aerosol) for 2010-01-01 and boundary conditions (emission fluxes and deposition velocities) for 2010-01-01 to 2010-01 -02.
OIFS_INIDATA_DIR_CBA  –  As above but for 'bascoetm5' chemistry. 

The prep-ic-icmcl-compo.sh script requires external software: the CDO command line operators to manipulate and analyse climate and NWP model data which are available here: https://code.mpimet.mpg.de/projects/cdo/. 

to 2010-01-02.

OIFS_INIDATA_DIR_CBA
As above but for 'bascoetm5' chemistry. 

Further settings that need changing in config.h You need to edit variables inside the file config.h to correspond with the chosen settings for your experiment before running the script to generate the initial data. The settings are described in the following section.

Once all the changes have been made in the configuration file the prep script can be run. Running the prep script will take a few minutes and result in new data written to folder chem_ic.

Afterwards the platform-specific job wrapper script can be executed to submit the model experiment job to the batch scheduler.

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