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• Create a new directory (here called we name this directory /data/openifs-ac) which will contain additional data that is required for atmospheric composition modelling and it will also contain the new OIFS_DATA_DIR.  

• Download the four additional data tarballs tgz archives that are required for OpenIFS chemistry experiments into /data/openifs-ac :
  ${datapath}=/nm6/oifs/

  No Format
  cd /data/openifs-ac module load ecfs ecp ec:/${datapath}/oifs-ac-43r3-chem.tgz .   ecp ec:/${datapath}/oifs-ac-43r3-xtra.tgz . ecp ec:/${datapath}/oifs-ac-43r3-initcond.tgz . ecp ec:/${datapath}/ICMCL-2010.tgz .

  
  

• Unpack the following files:  oifs-ac-43r3-chem.tgz and oifs-ac-43r3-xtra.tgz into /data/openifs-ac. This will result in the following directory structure inside /data/openifs-ac : 

• set the new environment variable for your OpenIFS/AC installation:   export OIFS_DATA_DIR=/data/openifs-ac/43r3

The following two tgz archives can be unpacked to any location (, however in this example the files will be retained in we will also extract them into /data/openifs-ac):

• Unpack oifs-ac-43r3-initcond.tgz into /data/openifs-ac which results in a directory /data/openifs-ac/INITIAL-CONDITIONS. These The files therein are initial data files for the first day of month for all 12 months of 2010.
• Unpack ICMCL-2010.tgz into /data/openifs-ac which results in a directory /data/openifs-ac/ICMCL. This directory contains monthly files with surface boundary conditions (e.g. SSTs, soil temps, albedos, LAI etc).

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• .
• From you conventional OpenIFS installation's OIFS_DATA_DIR copy the directories ifsdata and rtables to /data/openifs-ac/43r3 as they are also needed here.
• Further, create a directory /data/openifs-ac/43r3/wam which needs to contain wave model initial data for 2010-01-01.  (presently files are copied over from cca:/lus/snx11062/scratch/ms/nl/nm6/ECE-DATA/OPENIFS/43r3)

Building the model

On the ECMWF HPC Atos it is possible to compile the model using a login node.  On the ECMWF Cray XC40 it is recommended to open an interactive session on a MOM node for compilation:

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If you have a configuration script that sets the appropriate environment for OpenIFS you should run this firstthis first before building the model executables. 

In your command line you should type:  type   export OIFS_CHEM=enable   to overwrite the default setting in oifs.fcm (or alternatively you can edit the variable in file oifs.fcm)

Further you should make a choice whether you want to build with XIOS server support, in that case set appropriate environment variables. Otherwise set   export OIFS_XIOS=disable   to disable XIOS. 

Then compile the model using fcm (here with verbose output and with 12 parallel child processes):

cd $OIFS_HOME/make
fcm make -v -j 12 -f oifs.fcm

Only proceed further after the code has compiled and all the executables were built without errors.

Run the acceptance tests

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Note:  only tm5 chemistry seems to work, model fails with bascoetm5b

Running OpenIFS/AC in Forecast or Climate Mode

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