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DWD ICON Tools

DWD ICON Tools contain a set of routines which may be suitable for reading, remapping and writing of fields from and to predefined grids, e.g., regular (lat-lon, gaussian) or triangular (ICON). It can be used to generate lateral boundary conditions (LBC) and initial conditions (IC) for ICON-LAM simulations.

Support status

The master branch is continuously being tested on Piz Daint.

Access

In order to get access to the DWD ICON Tools repository hosted on the C2SM GitHub organisation , please contact your group's technical contact. They will be responsible for adding you to the appropriate user group.

Compile

Spack takes care of configuring and building Icontools. For detailed instructions, please consider the official spack-c2sm documentation . The following Spack installation should be sufficient for most cases:

spack install icontools@c2sm-master%gcc

After the installation, you need to load the package with Spack:

spack load icontools

Run

The folder C2SM in the icontools repository contains a bunch of scripts to run iconremap and icongridgen on Piz Daint. Most likely you will use the DWD ICON tools to generate a new grid or interpolate boundary conditions for limited-area ICON runs.

Below is a recipe to create initial and boundary files for an ICON-LAM run on Piz Daint.

Clone the repository

git clone git@github.com:C2SM/icontools.git

Generate a new ICON grid

icongridgen --nml icontools/C2SM/gridgen.nml

Interpolate BC from IFS

This manual refers to the workflow MeteoSwiss currently uses to run LAM simulations.

  • Add fields FI and z from IFS analysis to LBC prior to the interpolation using cdo (GRIB only). To use the cdo command, make sure the module is loaded: module load daint-gpu CDO.

    cdo -selname,FI analysis_file fi_file
cdo -selname,z analysis_file z_file
cdo settime,'03:00:00' fi_file fi_file_time
cdo settime,'03:00:00' z_file z_file_time
cdo setreftime,2019-09-30,03:00:00  z_file_time z_file_reftime
cat lbc_file zfile_reftime fi_file_time > complete_file

  • Adapt scripts icontools/C2SM/remap_ini and icontools/C2SM/remap_lbc to your needs

  • Remap IFS data for BC:

    sbatch -A <account> icontools/C2SM/remap_lbc

  • Remap IFS data for analysis:

    sbatch -A <account> icontools/C2SM/remap_ini

Documentation