with a coupled ocean-sea ice model (North Atlantic Arctic Ocean Sea Ice Model, NAOSIM) show a destabilisation of the halocline due to increased freezing in polynyas of Arctic shelf seas. We are planning to [...] of the coupled atmosphere-sea ice-ocean system during different sea ice regimes as a function of spatially heterogeneous surface properties (e.g., albedo, temperature, sea ice, and snow thickness). These [...] global climate models. A focus will be the Barents Sea, where strong surface heat fluxes foster low sea level pressure and shallowdepth export of water and sea ice. The export is compensated for by a corresponding

export of sea ice and relatively fresh water through Fram Strait depend on these sea ice properties. A feedback loop connects oceanic heat transport, winds and sea ice transport in the Greenland Sea (Kovacs [...] of the Arctic Ocean. Such waters flow in from the Nordic Seas. An interchange of waters between the Arctic and the Nordic seas results in in sea saw fluctuations in fresh water content between the basins [...] water we employ ocean sea ice and large-scale Earth System models. The models are validated using sea ice drift estimates from satellite remote sensing and regional airborne sea ice thickness measurements

MOSAiC
For days, fast sea ice had slowed the progress of the resupply icebreaker Kapitan Dranitsyn; bound for the North Pole, her mission was to support the second exchange of researchers and crew in

the following paragraphs, the team from the first leg of the journey, which was dominated by thin sea ice, review the mission so far: despite extremely challenging conditions, they maintained a steady

floe: the sea ice in which the research vessel Polarstern is now drifting through the Arctic was formed off the coast of the archipelago, which separates the East Siberian Sea and the Laptev Sea to the north [...] north of Siberia, in December 2018. Sediments, and even small pebbles and bivalves, were incorporated into the ice during the freezing process, which the on-going melting process has brought to light on

patterns of Arctic sea-ice leads Willmes, S., Heinemann, G. 14:45-15:00 Sea ice drift and deformation from SAR data in Russian Arctic seas Demchev, D., Klyachkin, S. 15:00-15:15 Special sea ice ship observations [...] production in the Finite Element Sea-ice Ocean Model (FESOM) Schnaase, F., Kohnemann, S., Heinemann, G. 14:30-14:45 Atmospheric circulation regimes related to sea ice and sea surface temperature changes Handorf [...] 14:45-15:00 Connections between sea-ice conditions in Arctic and blockings in the Northern Hemisphere Timazhev, A.V., Mokhov, I.I. 15:00-15:15 Separating the impact of sea ice and sea surface temperature changes

long- range transport of sea ice and ice-rafted matter T. Krumpen et al. 11:30-11:40 WP1- Ideas for final phase 11:45-13:00 Lunch 13:00-13:20 WP2- AWI-AC: Evaluation of Arctic sea-ice drift and its dependency [...] dependency on near- surface wind and sea-ice concentration and thickness in the coupled regional model HIRHAM-NAOSIM X. Yu et al. 13:25-13:45 WP2-AARI: Shipbased sea ice observations in the Arctic and its [...] 14:30-15:00 Coffee break 15:00-15:20 WP3- AWI-AC: Separating the impact of sea ice and sea surface temperature changes on Arctic climate and its linkages to mid-latitudes R. Jaiser et al. 2 15:25-15:45

on variations of sea ice along the Northern Sea route Computation of length of navigation season for the Northern Sea route along the Russian coast Retrospective modeling of synoptic sea ice dynamics and [...] (WP3) • Cyclone and wind-wave activities influencing sea ice dynamics and risk of navigation along Northern Sea routes (WP4) • Impact of Arctic sea ice and cyclones on biodiversity and productivity of [...] global feedbacks between atmosphere, sea ice and impacts on ocean circulation systems will be determined. • The role of changed Arctic sea ice conditions for Northern Sea routes will be computed using POLARIS

Researchers of the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, together with the Bremerhaven Zoo have developed a special exhibition on the reintroduction of the European oyster (Ostrea edulis) into the North Sea. On display are living European oysters in an aquarium, a detailed model of an oyster reef and its inhabitants as well as background information on the ecological importance of the species in the exhibition.

dynamics and development of upper ocean temperature and stratification in the Subarctic North Pacific and its marginal seas. A major effort is the development of a detailed stratigraphic framework in order to