JSBACH (Jena Scheme for Biosphere-Atmosphere Coupling in Hamburg)#
Contact person
Description#
Historically, JSBACH grew out of ECHAM5 by collecting all land processes into a separate land component – then called JSBACH – accessed from ECHAM each time step via a single subroutine call. Accordingly, JSBACH inherits all the land processes originally present in ECHAM5, in particular the way the surface energy balance is solved, and how the land processes are coupled to the atmosphere.
JSBACH uses the I/O, memory handling, parallelization, time stepping, and calendar infrastructure of ECHAM. Within JSBACH there is no communication between grid boxes. In JSBACH, each grid box is equipped with a sub-structure (“tiling”) to represent diversity of land cover types within a grid box, in particular the diversity of plant functional types (PFTs) representing various vegetation types.
Despite being integral part of ECHAM, JSBACH can be run independently forced by meteorological data (observed or simulated).
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.
Model(s)#
JSBACH v4.3 :BSD-3C
Programming language(s)#
Python FORTRAN