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In config.h you should edit the following variables:

• Path variables need to be set to the appropriate locations. In our example described in the Section above these locations can be found in the OIFS_DATA_DIR 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 at Tl255L91. The ICMCL files contain boundary conditions (e.g. SSTs) for the entire month. 

OIFS_INIDATA_DIR_TM5
This points to a directory containing initial conditions required for the 'tm5' chemistry (two versions for Tl255L91 are available: one with AER aerosol and one without) for 2010-01-01. It also contains boundary conditions (emission fluxes and deposition velocities) for 2010-01-01 to 2010-01-02.

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PLATFORM='ecmwf-atos'   # this needs to match the name of the platform configuration file
EXP=abcd                # experiment ID (4-letter word, must not start with '0')

RUNDIR=${SCRATCH}/43r3/experiments/${EXP}/runs         # this is the experiment directory
AC_IC_DIR=${SCRATCH}/43r3/experiments/${EXP}/chem_ic   # stageing directory for initial and boundary conditions data files

# Simulation start and end date. If setting time (not mandatory), **put it before** the date
run_start_date="00:00 2010-01-01"
run_end_date="${run_start_date} + 2 days"
 
rst_freq='3 day'        # run for 3 days without restarts (no multi-leg exp)
USE_RESTART=false       # Do not write restart files (no multi-leg exp)

Path variables need to be set to the appropriate locations. In our example described in the Section above these locations can be found in the OIFS_DATA_DIR under /data/openifs-ac: 

OIFS_INIDATA_DIR=${OIFS_DATA_DIR}/INITIAL-CONDITIONS/T255L91-tm5-aer   # Initial and boundary conditions for the chemistry scheme used
ICMCLDIR=${OIFS_DATA_DIR}/ICMCL                      # physical boundary conditions
MET_IC_DIR=${OIFS_DATA_DIR}/ICMCL/aabg/2010010100    # path for meteorological initial data in case it needs to be generated
AC_IC_ONCE=${OIFS_DATA_DIR}/INITIAL-CONDITIONS/T255L91-tm5-aer/ICMUAoiac.ac_rst   # initial conditions for chemical tracers

Further variables and settings that need changing in config.h are described below in the next section for four possible forecast experiment configurations.

Once all the changes have been made in config.h, the experiment initial and boundary condition files can be prepared as described in the following section. 

After the data has been prepared the platform-specific job wrapper script can be executed to submit the model experiment job to the batch scheduler.

Example configuration settings for single forecast experiments

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