Remapping ERA5 to icon grid for initial/boundary condition

Initial/Boundary Data
1

I am trying to initialize a limited area run using ERA5 initial/lateral boundary conditions.

I am not from DKRZ or a partner institute. Please guide me to install the iconremap tool.

The git clone command to get the dwd_icon_tools throws this error:

Cloning into ‘dwd_icon_tools’…
git@gitlab.dkrz.de: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

``

Any suggestions or workarounds would be helpful.

2

The DWD ICON Tools are not publicly available. We recommend using CDO for the interpolation to the ICON grid. There are several examples:

  • The Note for Beginners here provides a link to Jupyter Notebooks that contain detailed descriptions for remapping with CDO.
  • There is dedicated section in the docs on remapping ifs/era data with CDO.
1 Like
3

Thank you for the response. Could you also please clarify if I should get the ERA5 fields in pressure levels or model levels? I could not find clear information on this in the docs.

4

The vertical coordinate of IFS is a pressure coordinate. I am not sure what’s exactly available for ERA, but with model levels you should be on the safe side.

See also the remark on the vertical coordinate here: Initial and Boundary Data from IFS — ICON documentation

1 Like
5

Got it. Thank you so much.

6

Hi,
potentially there is no need for any remapping of ERA5 data. See following publication:
https://www.dwd.de/EN/ourservices/reports_on_icon/pdf_einzelbaende/2026_12.html?nn=495490#download=1