CCA4: Air mass transport and transformation

CCA4 aims to understand spatio-temporal transport and transformation of air masses and to ultimately quantify their contributions to Arctic amplification. In phase II powerful diagnostics using observations, reanalysis and modeling at various resolutions have been developed and applied to case studies. Moreover, unique obseravtions targeting the observation of the same air mass during multiple instances have been perforemd and will be exploited in depth in phase III.

• When and how do transitions of cloud regimes occur in CAOs and WAIs?
• What is the importance of sublimation for air mass transformations?
• Which types of aerosols are transported by ARs and what effect do they have on precipitation efficiency?
• What influence does the state of the sea ice have on the anomalous moisture tranport into the central Arctic?