north of Greenland was the area of study in the last of three Arctic expeditions undertaken by the Polarstern since the end of May 2025. In the largely untraveled waters north and northeast of Greenland [...] the Alfred Wegener Institute were able to collect unique data on ocean circulation in the area. A chain of six moorings was also deployed to conduct autonomous measurements over the course of a full year

Physics, Markus Rex led the MOSAiC-Expedition , the largest Arctic research expedition of our time, during which the research vessel “Polarstern” was frozen in the Arctic ice for a year to study the [...] . Scientists from 20 nations collected valuable data about the Arctic, which is crucial for understanding the future climate change. In the SR3 podcast “Aus dem Leben”, Markus Rex reports on his [...] and regulating the exchange of heat and moisture between the ocean and the atmosphere, explains Prof. Christian Haas. Changes in the extent and thickness of sea ice therefore serve as important

majority of the exchange processes between the atmosphere and the ocean. The observed sea ice changes affect the climate and ecosystem, extending to our latitudes. The decline of Arctic sea ice in area [...] more > The Barents Observer | 28.07.2020 Sea ice extent in the Arctic reaches historical low in July Find out more > Carbon Brief | 18.11.2019 Inside MOSAiC: How a year-long Arctic expedition is helping [...] Keynote speech | 3.11.2021 Keynote speech on MOSAiC – the greatest Arctic expedition of our time 2021 United Nations Climate Change Conference Policy advice

rising temperatures are melting more and more frozen ground in the Arctic. This dissolved matter contains large amounts of organic carbon which is flowing into the central Arctic ocean. In a new study, [...] how much terrestrial organic matter accumulates in the central Arctic Ocean. Using chemical fingerprints, they were able to assess how fast it degrades, thus releasing additional CO2 to the ocean. These [...] are an important basis to project how inputs from land affect Arctic marine ecosystems and the ability of the ocean to store CO2 in a warming climate. The results are published in the journal Nature

Polarstern The Research Vessel Polarstern has been underway in the Arctic and Antarctic for 40 years, giving experts from around the globe the opportunity to safely and effectively conduct research in two [...] preserving the ecological equilibrium of the polar regions and oceans for future generations. The requirements profile reflects the lessons learned over the Polarstern’s nearly 40 years of service. The

10.1126/science.adq7280 . Wang, Q., S. Danilov, and T. Jung, 2024: Arctic freshwater anomaly transiting to the North Atlantic delayed within a buffer zone. Nature Geosci ., 17 , 1218–1221, doi.org/10.1038 [...] . Mueller, D. Sidorenko and T. Jung, 2024: Eddy activity in the Arctic Ocean projected to surge in a warming world . Nature Climate Change , 14 , 156–162, doi.org/10.1038/s41558-023-01908-w . Koldunov, [...] , S. Danilov, Q. Wang and T. Jung, 2022: Long-term evolution of ocean eddy activity in a warming world. Nature Climate Change , 9 , 910–917, doi.org/10.1038/s41558-022-01478-3 . Rackow, T., S. Danilov

particular interest focuses on species interactions in temperate and Arctic regions and on the effects alien marine organisms on native coastal ecosystems. Mathias Wegner Parasites are everywhere! That's why [...] parental environment effects on offspring traits) in response to ocean warming. So far, I can say that maternal effects play an important role in populations’ adaptive responses to climate change, but

Klieschen Taucheinsatz ArcWatch Interaction and feedbacks between ocean structure and dynamics, sea ice physics, biogeochemistry, and biodiversity of the Arctic Ocean. Organic compounds in the Arctic Ocean and the deep Atlantic Ocean are derived from marine algae and from a substantial input by the large Arctic Rivers. For us, ArcWatch [...] elucidate, if the amount of dissolved organic compounds in the Arctic Ocean changed over the last decades. We also aim at quantifying the contribution of terrestrial organic matter because it represents

function and distribution of organic compounds in the changing polar ocean. We aim to understand the function of marine organic compounds, both, as diagnostic markers to decode biogeochemical processes and [...] we are investigating the influence of Atlanticification on the Arctic ecosystem around Spitsbergen. To this end, we are studying four fjords with varying degrees of Atlanticification influence, from [...] future biological carbon pump Subtopic 6.4 Use and misuse of the ocean: Consequences for marine ecosystems Publications of the Section Biological carbon pump Influence of seawater chemistry on community

Long Term Observations Surface Meteorology in the Arctic (AWIPEV Research Base in Ny-Ålesund, Spitsbergen) Ny-Ålesund from above. (Photo: Alfred Wegener Institut) Ny-Ålesund is located on [...] fjord at the west coast of Svalbard (Spitsbergen). In this region, ocean currents from lower latitudes impact the sea water temperature, and the ocean is a heat storage affecting the local climate. Although Ny-Ålesund is situated in the high Arctic (78.9°N, 11.9°E), daily mean temperature in summer is above the freezing point. The interannual temperature variability in winter