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• create a new directory which will contain the additional data that is required for atmospheric composition modelling and it will also contain the new OIFS_DATA_DIR.  Here we call this location /data/openifs-ac. 

• download the required four additional data tgz archives into /data/openifs-ac.  The following commands will work on the Atos HPC:

  No Format
  cd /data/openifs-ac module load ecfs ecp ec:/nm6/oifs/oifs-ac-43r3-chem.tgz .   ecp ec:/nm6/oifs/oifs-ac-43r3-xtra.tgz . ecp ec:/nm6/oifs/oifs-ac-43r3-initcond.tgz . ecp ec:/nm6/oifs/ICMCL-2010.tgz .

  
  

• Unpack 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 : 

  43r3/chemistry	AC specific
  43r3/xdata	AC specific
  43r3/rtables	Standard dataset for

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• OpenIFS 43r3
  43r3/climate.v015	Standard dataset for

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• OpenIFS 43r3 + AC specifics
  43r3/ifsdata	Standard dataset for

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• OpenIFS 43r3

  43r3/wam

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• Wave model data for OpenIFS 43r3, needs to be added explicitly

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• 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 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.
  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).
• 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)

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