Generation of HD parameters files for ICON grids: technical note
Thomas Riddick · 2021
This document describes the procedures used to generate river directions and parameters for use with the JSBACH4 HD model running on ICON Icosahedral grids (see section 2). The results of this procedure required to run the JSBACH4 HD model on a r2b4 grid (as used in the ICON Earth System Model Version 1.0) are presented in section 3. It also provides technical instructions for generating these parameters in the necessary format (see appendix A). The basic method varies depending on whether river directions are required for a low (coarse) resolution ICON grid such as r2b3 or r2b4 or a fine resolution ICON grid such as r2b9. For low resolution grids the method also varies depending on whether it is desired to include internal (endorheic) drainage basins or not. (The words basin and catchment are used interchangeably in this document.) Discussion on the JSBACH4 HD model, on river direction determination in general and on the tools for this purpose at MPI-M is given in section 2.1.