AWI-ESM3 high resolution model contribution to CMIP7: First results of the model response in the Arctic regions during the historical period

Earth system modelling is an important instrument to investigate climate change in an integrated way, taking into account the interactions between the different compartments of the Earth system. It is also an important tool to perform climate projections for different climate scenarios in order to take appropriate mitigation and adaptation measures. Such climate simulations are coordinated internationally as part of the World Climate Research Programme’s (WCRP) Coupled Model Intercomparison Project Phase 7 (CMIP7).
The Alfred Wegener Institute (AWI) will participate in the CMIP7 project with the Earth system model AWI-ESM3. This is being done as part of the German contribution to the Coupled Model Intercomparison Project (CAP7).
One focus of our work is the impact of anthropogenic aerosol forcing during the historical CMIP7 period. Earlier versions of the AWI climate model setup used a fixed aerosol climatology and thus clearly overestimated the temperature increase for the historical period due to the lack of changing direct and indirect aerosol effects. The implementation of transient aerosols brings the simulated historical period closer to observed trends.
In this presentation we will show first results of the CMIP7 historical experiment performed by the AWI-ESM3 high resolution model including the impact of transient aerosol forcing. We will discuss the results with respect to the Arctic regions and the comparison to observations and climate performance indices.