Use Case for Limited-Area ICON-NWP (R19B07)#

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wget https://swift.dkrz.de/v1/dkrz_4d992e1b-f237-4258-a2bc-138ca6a1cf59/icon-model-use-cases/nwp-local-R19B07.tar.bz2

Input files:

Grid files: nwp-local-R19B07/grids/icon_grid_0046_R19B06_LR.nc: R19B06 grid (4 km effective mesh size), reduced radiation grid; nwp-local-R19B07/grids/icon_grid_0047_R19B07_L.nc: R19B07 grid (2 km effective mesh size), limited-area domain over Germany; nwp-local-R19B07/grids/icon_grid_0047_R19B07_L_lbc.nc: R19B07 grid (2 km effective mesh size), frame grid for sparse lateral boundary reading

External parameter file: nwp-local-R19B07/extpar/icon_extpar_0047_R19B07_L_20220601_tiles.nc: External parameter file

Initial conditions: nwp-local-R19B07/data/igfff00000000: Initial data for August 31, 2023, 00 UTC

Lateral boundary conditions: nwp-local-R19B07/data/*_lbc: Lateral boundary conditions (3 hourly) for up to +24h

Dictionaries nwp-local-R19B07/mapfiles: Files to map the ICON internal variable names to I/O names used for ECCODES (GRIB2 shortnames)

Running the test:

Run script nwp-local-R19B07/run_icon_d2: run-script for ECMWF Atos computer in Bologna

Log output nwp-local-R19B07/run_R19B07.39865769.out: job-log file of a run on Atos with icon-model-2025.10

Recommended resources:

1024 cores

Estimated runtime (for resources indicated above):

24h forecast about 42 minutes on 1024 cores of the Atos Computer of ECMWF in Bologna

Description#

This use case runs a limited-area (local) ICON application over Germany with a resolution of about 2 km (R19B07). This use case is comparable to DWD’s operational application ICON-D2.

The run-script run_icon_d2 defines the batch-parameters (for SLURM on Atos), sets I/O directories and all the necessary namelist input for ICON. It can easily be modified to run on different platforms.

The file run_R19B07.39865769.out contains the job log file and ASCII output from the ICON run.

run_icon_d2_2025.04 is an older version of the run-script. Some namelist input has been adapted now.