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This document describes the required work steps to carry out the control experiment and subsequent perturbation experiments on the ECMWF HPCF.

In contrast to the Acceptance Test this does not require an interactive session on the Cray's postprocessing node. We will submit the model experiment as a batch job.

Part 1 – Control Experiment

We will use a pre-compiled and pre-installed version of OpenIFS 43r3. 

We will carry out a control experiment with a duration of six days, starting on 25 Sep 2016 00h00, using the model with cubic octahedral grid at horizontal resolution T399.

Preparing the Model

In your working group you should login to the RACC cluster and login to the ECMWF HPCF with your training account ID.

Tasks - Connect to HPCF
  1. Start the Mobaxterm application and open a local terminal
  2. Login to the RACC using  ssh -X cluster.act.rdg.ac.uk

  3. On the cluster type the command:  ssh troifsX@ecaccess.ecmwf.int      Note:  Instead of troifsX you should use your ECMWF training user-ID

  4. You will be prompted for the hostname with a choice between ecgate, cca and ccb.  You should select ccb.
  5. When you have completed your work you can disconnect from ccb by typing exit at the command prompt.


In a previous exercise you have called the my43 script which in turn has copied further scripts to your local ~/bin directory.  You should now use the script getkarl to copy the NAWDEX control experiment to your training account. 

Tasks - Connect to HPCF
  1. Type the following command:  getkarl

The script copies all the files required for the control experiment to the following location:  ~/scratch/tc-karl_h7cc

Note that this directory will contain the pre-compiled master.exe file which already includes the software branch which we later will use to perturb the physics tendencies.  In the control run we will leave these at their standard setting.

Directories for climatological input files are mostly included through symbolic links to a central storage location. 

% ls
399_4@          ICMSHh7ccINIT  master.exe   sfcwindin        wam_namelist
ICMCLh7ccINIT   cdwavein       oifs_run     specwavein       wam_subgrid_0
ICMGGh7ccINIT   fort.4         rtables/     uwavein          wam_subgrid_1
ICMGGh7ccINIUA  ifsdata@       run.ccb      wam_grid_tables  wam_subgrid_2

The file

Part 2 – Perturbation Experiment

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