Assessment of JSBACHv4.30 as a land component of ICON-ESM-V1 in comparison to its predecessor JSBACHv3.2 of MPI-ESM1.2

. We assess the land surface model JSBACHv4, which was recently developed at the Max Planck Institute for Meteorology as part of the effort to build the new Earth System model ICON-ESM. We assess JSBACHv4 in simulations coupled with ICON-A, the atmosphere model of ICON-ESM, hosting JSBACHv4 as land component to provide the surface boundary conditions. The assessment is based on a comparison of simulated albedo, Land Surface Temperature (LST), Leaf Area Index (LAI), Terrestrial Water Storage (TWS), Fraction of Absorbed Photosynthetic Active Radiation (FAPAR), Net Primary 5 Production (NPP), and Water-Use-Efficiency (WUE) with corresponding observational data. JSBACHv4 is the successor of JSBACHv3, therefore, another purpose of this study is to document how this step in model development has changed model biases. This is achieved by also assessing in parallel results of coupled land-atmosphere simulations with the preceding model ECHAM6 hosting JSBACHv3. Large albedo biases appear in both models over ice sheets and in central Asia. The temperate to boreal warm bias observed 10 in simulations with JSBACHv3 largely remained in JSBACHv4, despite the very good agreement with observed LST in the global mean. For the assessment of changes in land water storage, a novel procedure is suggested to compare the gravitational data from the GRACE satellites to simulated TWS. It turns out that the agreement of changes in the seasonal cycle of TWS is sensitive to the representation of precipitation in the atmosphere model. The LAI is generally too high which is partly caused

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