CCA2: Surface parametrizations

The name of CCA2 has been changed from “Coupeled Surface-Atmosphere-Processes” to “Surface-related Parametrizations in Models”. Phase III is intended to further deepen the implementation and testing of surface related parametrizations in models which was already started in phase II. Therefore, we want to constrain the focus of CCA2 to the analysis of the relative importance of improved characteristics and near-surface processes in the Arctic.

• What is the sensitivity if individual surface parameters and near-surface processes on the Arctic surface radiation budget?
• How does their sensitivty depend on the spatio-temporal distribution of surface characteristics?
• What are the crucial parameters, which need to be refined in modeling of processes in the Arctic, for example, to reproduce the timing of melt onset and refreezing?
• How do the various surface ocean environments (open sea, MIZ, sea-ice covered, melt ponds) impact the atmospheric radiation budget through INP andCCN formed by marine aerosol production?