Inluence of sea ice leads or polynyas on Arctic cloud properties (B07*)

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The wintertime Arctic sea ice area is characterised by different degrees of fracturing. Leads and polynyas result in a substantial heat and moisture flux from the relatively warm ocean to the cold atmosphere. They thus alter the atmospheric boundary layer structure, cloud cover, and the surface energy budget and also affect atmosphere-ocean chemical exchanges. To quantify the influence of leads or polynyas on clouds, the micro- and macrophysical properties of surface-coupled clouds during onshore winds in the presence of leads or polynyas will be compared to clouds observed during onshore winds in closed sea-ice conditions.