ICON-L also known as JSBach is as now a optional component of the German natESM system.
ICON-Land is a framework for the modeling of land processes in ICON and can be used as a stand-alone land surface model as well as in the fully coupled ICON Earth System model or in the ICON atmosphere-only model. It is specifically designed in a modular way for the integration of concurrent and alternative process and surface descriptions in a flexible and easy-to-use way. Currently, specific process implementations include the JSBACH and the QUINCY model configurations.
JSBACHv4 is the land component of ICON-A and thus also integral part of the first version of ICON-ESM. Technically, JSBACHv4 is a subroutine of ICON-A and part of its scheme for the implicit solution of vertical diffusion. JSBACHv4 is the successor of JSBACHv3 (Reick et al., 2013, 2021), but with a completely renewed structure. One completely new aspect of the JSBACH4 infrastructure is the representation of surface heterogeneity as a hierarchical tree of surface types (tiles), where each process is associated with specific sub-trees. It is possible to choose different configurations of varying complexity for the description of the land-surface characteristics and the processes that run on the respective tiles.
The software ICON-L is now open-source (BSD-3C license).
--> Look in the natESM system table for more information about this optional component.
More information, references, model description about ICON-L here and the JSBach documentation.
NEW: There is also a forum board for exchange about ICON in general.
If you want to get started, have a look on the ICON website.