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

sources are in deep-sea sediments. We attempt to use this new tracer as a tool to quantify the upwelling rates of deep water masses (including NADW) that enter the Southern Ocean from the north. [...] deep ocean. In an analogous way it is also used for the study of resuspension rates near the deep-sea floor. 230Th and 231Pa We know the production rate of 230 Th (Half-life 75400 y) and 231 Pa (half-life

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

for the polar regions Sea Ice Motion and Deformation Envisat ASAR image of different sea ice types (© ESA / Envisat, 2006) (Photo: Alfred Wegener Institut) Drift and deformation of sea ice Polynias Terra [...] topic is called “ZackSAR”. Here, radar remote sensing data are evaluated for Zackenberg valley in north east Greenland. In 2013 and 2014, expeditions took place in the area. During field work, the environmental

(Photo: Alfred-Wegener-Institut) LC-MS/MS chromatogram of a planktonic field samples from the North Sea containing several phycotoxins. Chemical structures of several phycotoxin classes. Current list

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

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

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

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