forward to continuing the one-year-long MOSAiC expedition and its research on the ocean, ice and atmosphere in the Arctic. Earlier this week, their predecessors from Leg 3 returned to Bremerhaven on board

The polar regions are a key driving force for the Earth's climate and oceans. With the Alfred Wegener Institute's research in the Arctic and Antarctic, we contribute to the understanding of the global climate [...] relating to the Arctic and Antarctic and is designated by the European Union as a central element of its joint polar research strategy. Another important EU project is ARICE, the Arctic Research Icebreaker [...] Icebreaker Consortium. Within its framework, international coordination of ship-based research in the Arctic is being expanded. ARICE will also give scientists from different countries access to a number of

of an Arctic Sea Ice–Ocean Model by a Genetic Algorithm, doi.org/10.1175/MWR-D-18-0360.1 Sumata, H., Kauker, F., Karcher, M. und Gerdes, R., 2019b: Covariance of Optimal Parameters of an Arctic Sea Ice–Ocean [...] the Arctic summer minimum sea ice extent in September from the beginning of the melting season in May/June on. While the strongest greenhouse gas induced changes are currently observed in the Arctic, it [...] However, this approach neglects all feedbacks of the sea ice-ocean system on the atmosphere. Since 2015 the initial state of the sea ice-ocean model is constrained by sea ice observations (data assimilation)

emulators and foundation models for: Sea ice, ocean, and climate systems. High-resolution downscaling for local climate insights. AI-based diagnostics for tracking ocean eddies and other key processes. AI-powered [...] Climate Change Investigating fundamental climate processes, including: Large-scale atmospheric and ocean circulation. Climate variability and long-term climate trends. The role of polar regions in shaping [...] simulations, and theory. Model Development FESOMx – The next-generation Finite volumE Element Sea Ice-Ocean Model, designed for: High performance (GPU-ready, Python-based, mixed-precision). Modular and scalable

SIPRE corer Exposed Holocene ice wedge at the shore of the Arctic Ocean Aerial view of the city of Kotzebue, Arctic Alaska Rainbow over the the Arctic tundra Old 'Welcome to Kotzebue' sign, Kotzebue, Alaska

Double-Trouble Resilience and vulnerability of the central Arctic Ocean food web to cumulative stress by warming and anthropogenic pollution. Head of Group Dr. Doreen Kohlbach Further members of the Junior [...] for polar marine food webs. Previous research suggests that pelagic food webs in the Central Arctic Ocean (CAO) are highly dependent on ice-associated food sources (Fig. 1), but how prevailing trophic [...] waters, riverine input and marine traffic will bring more anthropogenic pollutants, even to remote Arctic regions, where they are entrained in water and sea ice, and transferred along the marine food chain

specially adapted biotic community. Ice-covered seascape in the Arctic Ocean (Photo: Esther Horvath) The deep sea in the polar regions In the Arctic, living at the bottom of the sea poses unique challenges for [...] standards. For another, food is harder to come by. The central Arctic Ocean is largely covered with ice and – unlike the Antarctic’s Southern Ocean – surrounded by landmasses. Exchanges with the Atlantic and [...] than we do about the ocean depths. Yet the deep sea is not a habitat fully separated from the surface; it is already undergoing dramatic changes in response to warmer water, ocean acidification and en

and temporal variation in deep-sea meiofauna at the LTER Observatory HAUSGARTEN in Fram Strait (Arctic Ocean). MDPI - Diversity 12 (7). doi: 10.3390/d12070279 Käß, M., Vedenin, A., Hasemann, C., Brandt, [...] biomass of three epibenthic invertebrates from the deep-sea observatory HAUSGARTEN (Fram Strait, Arctic Ocean). Marine Ecology-Progress Series 602: 15-29. Grzelak, K., Kotwicki, L., Hasemann, C., Soltwedel [...] assessing temporal variations in benthic community structure, megafaunal composition and diversity at the Arctic deep-sea observatory HAUSGARTEN between 2004 and 2015. Deep-Sea Research I 122: 81-94. Vedenin, A

insights into key local-regional scale physical and chemical processes for atmosphere-ocean-ice interactions in the Arctic and Antarctic, their responses to, and influence on, projected changes in the global [...] Rinke . WP4. Arctic processes and O-A-I interactions in the coupled climate system Improved understanding of those key physical and chemical processes in the atmosphere, sea ice and ocean, and involved [...] involved interactions that play a major role in the coupled Arctic climate system and associated Arctic Amplification. AWI contribution led by Dr. Annette Rinke and Dr. Wolfgang Dorn . WP5. Antarctic processes

Coastal permafrost erosion, organic carbon and nutrient release to the arctic nearshore zone (COPER) Permafrost Erosion Arctic permafrost coasts, which account for 34% of the coasts of the Earth, are extremely [...] provided by the permafrost matrix and are instantly washed away by incoming waves. With warming in the Arctic expected to be roughly twice as high as the global mean, sea ice extent is expected to decline d [...] and changes to the nearshore food-web through the release of sediment and organic matter to the ocean. A comprehensive understanding of the processes at work at the local level is nonetheless still lacking