aims are to: Determine submarine permafrost thawing rates on the Bykovsky Peninsula (north Siberia) and Alaska North Slope using a combination of geophysical, sampling, and remote sensing methods Determine [...] permafrost landscape dynamics and Earth System feedbacks Permafrost coring in the Fish Creek Delta, North Alaska (Photo: Alfred Wegener Institut) Arctic permafrost landscapes change rapidly under the influence [...] permafrost thaw processes. Different study sites, such as the Lena Delta in Siberia or the Alaska North Slope, among others, serve as the key study sites for my research. Contact: Ingmar Nitze Keywords:

east of the Ross Sea operated in either dextral strike-slip or extensional motion throughout the region to the south and east of the Amundsen Sea Embayment and in the Bellingshausen Sea sector, connecting [...] on the Amundsen Sea shelf: (1) distributed rifting events parallel to the breakup front, (2) the influence of the Bellingshausen Plate motion with a plate boundary through the Amundsen Sea Embayment, and [...] and geothermal heat-flow data to improve our understanding of the role of the Amundsen Sea and Bellingshausen Sea shelves and margins in context of the continental breakup, activities of the West Antarctic

future projection experiments (e.g., sea ice outlook).We have been developed data assimilation system which exploits observed sea ice concentration, ice thickness and sea ice drift obtained from satellite [...] successfully applied to North Atlantic/Arctic Ocean Sea Ice Model (NAOSIM) developed at the Alfred Wegener Institute (AWI). We are currently working to apply the systems to Finite-volumE Sea ice-Ocean Model (FESOM2) [...] fields”, which are a set of ocean and sea ice variables optimally combining observations and a model. The analysis fields are applied for a variety of ocean and sea ice studies in the Arctic Ocean, and

Ocean receives freshwater by run-off from Asia north of the Himalaya. Large rivers carry freshwater from this enormous catchment area into the Eurasian shelf seas. Ocean waters with salinities below the average [...] balance 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 seasaw fluctuations in fresh water content between the [...] Current and sea ice flux through Fram Strait. Inflow of saline water from the South is equivalent to a fresh water export. Fresh water from the Arctic strengthens the stratification in the Nordic Seas and the

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.

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

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

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

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

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