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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 precompiled  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 everything at the 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

This directory contains now not only initial files for the atmospheric model (ICM*INI*) but also input files for the wave model. 

399_4  links to a directory which contains data on sea surface temperature and radiatively active greenhouse gases (e.g. ozone). 

rtables  contains input files for the radiation scheme.

run.ccb  is the model run script which will be submitted to the PBS job scheduler.  It calls oifs_run and loads all the module files and defines shell variable required for the runtime environment of the model.  Therefore the oifs-config.ccb.sh file is not needed in this case.

oifs_run  is a generic run script for the model.  It is possible to pass arguments to this script which is done by run.ccb.  At the end of the model experiment this script moves the model output to a specific output directory (which is numbered according to the OIFS_RUN variable).  Also command line grib tools are used to extract selected model fields into separate files. 

All settings and parameters which define the model experiments are set in namelists which need to be copied to fort.4.  We will explore here some of the values set in the namelists:

UTSTEP=900.0
CUSTOP='h144'
CNMEXP="h7cc"

NFPLEV=137
NFPMAX=399

NFRPOS=24
NFRHIS=24

Part 2 – Perturbation Experiment

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