ICON v2.6.6 Patch: for flexible SSTs in nested domains

Patch Content The patch allows to run ICON version v2.6.6 in a nested setup in which SSTs vary with time. As prerequisite, the SST time series need to be prepared for each nest independently. The setup was tested with daily updated SST from ERA5. Patch Extraction 1. get correct ICON version (access restricted due to licensing) git clone git@gitlab.dkrz.de:icon/icon-mpim.git --branch icon-2.6.6 --recurse-submodules 2. download patchwget -O icon-2.6.6-patch_sst-in-nests.patch "https://zenodo.org/records/18385022/files/icon-2.6.6-patch_sst-in-nests.patch?download=1" 3. apply patch cd icon-mpimgit apply ../icon-2.6.6-patch_sst-in-nests.patch --whitespace=nowarn 4. build and compile./config/dkrz/levante.intelmake -j16 Runscript Changes The user needs to change to following (example uses two nests and SST in Sept. 2020): 1. link sst files, e.g. ... # SST/SIC data sst_sic_data_path=${grids_folder} sst_file1=sst_sic_DOM01.nc sst_file2=sst_sic_DOM02.nc sst_files="'${sst_file1}', '${sst_file2}'" add_link_file $sst_sic_data_path/sst_sic_2020-09_DOM01.nc ${sst_file1} add_link_file $sst_sic_data_path/sst_sic_2020-09_DOM02.nc ${sst_file2} ... 2. provide sst files through namelist &lnd_nml ... sstice_mode = 6 ! 6: SST and sea ice fraction are updated with user-defined interval sst_td_filename = ${sst_files} ci_td_filename = ${sst_files} / Patch Creation The patch has been created with git diff release-v2.6.6...icon-2.6.6_sst-in-nests > ../icon-2.6.6-patch_sst-in-nests.patch Acknowledgements The development was supported by the IFCES2 project was funded by BMFTR (formerly known as BMBF - Federal Ministry of Education and Research) under grant number 16ME0689K as part of the SCALEXA funding initiative, which in turn was funded by the European Union - NextGenerationEU.