sea levels are the two most important cornerstones. We conduct marine geological research in the Arctic and Antarctic to more precisely define the inadequately known advance and retreat behavior of the [...] contributes to better reconstructing the history of global ice sheets and evaluating their influence on ocean circulation and sea level variations. As a result, models for future ice sheet behavior are then to

research in Arctic. 2015-11-27 On Arctic Dispatch News there is an article about our yedoma erosion study: "Speedily eroding North Slope river bluff offers window into ice age past" 2015-11-07 On Arctic Dispatch [...] contribution by rbb Wissenszeit: "Children ask questions" on the subject of "Climate change in the Arctic" , some PETA CARB members can be seen and heard. 2018-10-20 Based on an interview with PETA-CARB [...] Pole (in German only) 2018-09-06 Ingmar, Guido and other colleagues are authors of a guest post "How Arctic lakes accelerate permafrost carbon losses" in the science blog "CarbonBrief". 2018-09-05 A PNN newspaper

investigating the impact of altered ocean circulation and ocean warming on glacial calving on the coast of Greenland and on the ocean-sea ice system in the Arctic Ocean. In the past six years he has led [...] regions of the world’s oceans. He began his career by investigating deep-ocean currents in the tropical Atlantic, and completed his doctorate at the GEOMAR Helmholtz Centre for Ocean Research Kiel and Kiel [...] led five major research expeditions along the east coast of Greenland and in the Arctic Ocean, including the third leg of the international MOSAiC expedition on the research icebreaker Polarstern in 2020

research results from the past years here. Waves of the Southern Ocean (Photo: Alfred Wegener Institut) Oceans as a carbon store The oceans have absorbed more than a fourth of the anthropogenically generated [...] dissolves especially well in cold water. That is why ocean acidification is progressing primarily in the polar regions. Acidification of the Arctic Ocean could result in less availability of aragonite, an [...] forcing ocean dwellers to adapt to new living conditions. A deadly trio. After all, when the three factors have a joint impact, organisms in the ocean react extremely sensitively. Moreover, oceans as habitats

penguins, seals and whales of the Southern Ocean. As such, its role in the waters of the Antarctic is just as central as that of the polar cod in those of the Arctic. Antarctic krill (Euphausia superba) Antarctic [...] Peeken (r.) during fieldwork on Arctic sea ice (Photo: Alfred Wegener Institut) AWI biologist Hauke Flores (Photo: Alfred Wegener Institut) Nothing doing without ice The Arctic food web, depending on sea ice [...] ice (Photo: ArcCoML) The ice cover of the Arctic Ocean is a major pillar of marine life. Its freezing and melting determine as of when and for how long polar bears can prey on seals on the ice. The same

AWI’s sea-ice group in their work in the Arctic and Antarctic. The device is used to measure the sea-ice thickness in the polar regions, especially the Arctic. Deployment of the EM-Bird The AWI research [...] sensor sea-ice thickness sensor EM-Bird across Arctic or Antarctic sea ice. This video shows footage from different test and measurement flights in the Arctic. Source: Thomas Krumpen/Alfred-Wegener-Institut [...] it is carried away faster and more easily by wind and ocean currents. As a result, transport processes accelerate in most regions of the Arctic. On cloudy days Sea ice and snow on sea ice usually warm

AWI scientist Sinhué Torres-Valdés observed the nutrient chemistry of the Arctic Ocean on an expedition as part of the PEANUTS project (Primary production driven by Escalating Arctic NUTrient fluxeS). The SCRIPPS Institution of Oceanography led the expedition in 2018. The results have now been published in a paper in the journal Nature Communications. The PEANUTS project is funded by the Changing Arctic Ocean Program (CAO).

refreezing at the sea ice surface dramatically changes the energy exchange between atmosphere and ocean in the Arctic. Melt ponds play a key role in these changes, because they substantially enhance the absorption [...] albedo of Arctic summer ice from satellite optical data. Remote Sensing of Environment, 163, 153-164. doi:10.1016/j.rse.2015.03.012. Rösel, A.; Kaleschke, L., Birnbaum, G. 2012. Melt ponds on Arctic sea ice [...] early summer, when melt ponds started to form. From 9 May to 8 June 2008, we operated in the Canadian Arctic, mainly over the southern Beaufort Sea with Inuvik as airbase for Polar 5 . Sea ice conditions changed

refreezing at the sea ice surface dramatically changes the energy exchange between atmosphere and ocean in the Arctic. Melt ponds play a key role in these changes, because they substantially enhance the absorption [...] albedo of Arctic summer ice from satellite optical data. Remote Sensing of Environment, 163, 153-164. doi:10.1016/j.rse.2015.03.012. Rösel, A.; Kaleschke, L., Birnbaum, G. 2012. Melt ponds on Arctic sea ice [...] early summer, when melt ponds started to form. From 9 May to 8 June 2008, we operated in the Canadian Arctic, mainly over the southern Beaufort Sea with Inuvik as airbase for Polar 5 . Sea ice conditions changed

hemisphere are Svalbard, Greenland, northern Canada, Siberia and the Arctic Ocean. In the southern hemisphere we mainly investigate the oceans around Antarctica and the sub glacial geology of the continent, [...] to understand the processes that control the drift of the continents, how the opening of various oceanic gateways influenced global climate on long timescales. Our research in the polar regions is difficult