Simulating Arctic climate change and the impact on lower latitudes in high resolution (4.5 km in the Arctic) with AWI-CM

The fully coupled climate model AWI-CM is run on two different ocean grids to investigate the impact of horizontal resolution on the simulated Arctic Ocean circulation, and Arctic-Atlantic as well as Arctic Pacific linkages. The ocean-sea ice component runs on an unstructured grid, the low-resolution version has a grid size of about 24 km in the Arctic Ocean, while the high-resolution grid has a grid size of about 4.5 km resolution in the Arctic Ocean. The high-resolution grid has already been tested in uncoupled runs with CORE-II forcing, where is showed improved representation of Atlantic Water circulation and associated heat content in the Arctic.  Now, the impact of the higher resolution will be assessed in the coupled set-up and on longer time scales (150 years).