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The Arctic sea ice has not only declined over the past decade but has also become distinctly thinner and younger. Researchers are now observing mainly thin, first-year ice floes which are extensively covered with melt ponds in the summer months where once metre-thick, multi-year ice used to float.

Up to now the shore crab has belonged to those animal species thought by scientists to be more or less immune to climate change. One reason for this was that the crabs are highly tolerant to extremes temperature and feel just as at home in the eight degrees offered by the Atlantic as they do in the 20 degrees warm Mediterranean. A study conducted by German and Italian scientists has now shown, however, that shore crabs react most sensitively to temperature anomalies at certain times of life – as embryos in the egg.

How well are the most important climate models able to predict the weather conditions for the coming year or even the next decade? The Potsdam scientists Dr. Dörthe Handorf and Prof. Dr. Klaus Dethloff from the Alfred Wegener Institute for Polar and Marine Research in the Helmholtz Association (AWI) have evaluated 23 climate models and published their results in the current issue of the international scientific journal Tellus A.

Climate scientists are still grappling with one of the main questions of modern times: how high will global temperatures rise if the atmospheric concentration of carbon dioxide doubles. Many researchers are now turning to the past because it holds clues to how nature reacted to climate change before the anthropogenic impact. The divergent results of this research, however, have made it difficult to make precise predictions about the impact of increased carbon dioxide on future warming. An international team of scientists have evaluated previously…

For the first time the United Nations Environment Programme (UNEP) has today published a Report on the status of the global permafrost regions. In it an international team of experts clearly explains how climate change is impacting the permanently frozen soils in the Arctic, Siberia and in the high mountain regions, which potential hazards emanate from the thawing ground and the far-reaching consequences countries with permafrost must consider. The researchers also call upon politicians and climate scientists to include the knowledge about the change in…

Dr Juliane Müller will be awarded a second place in the German Study Prize on 6 November in Berlin. The Körber Foundation honours the geoscientist from the Alfred Wegener Institute for Polar and Marine Research in the Helmholtz Association for her pioneering PhD thesis on sea ice distribution.

The research ship POLARSTERN sets off in the early morning hours of 27 October 2012 for an unusual expedition to the Antarctic. This time the ship will not be returning to Bremerhaven as usual at the end of the Antarctic summer, but will be spending the winter in the South Polar Sea for research purposes.

The sea bed in the Arctic deep sea is increasingly strewn with litter and plastic waste. As reported in the advance online publication of the scientific journal Marine Pollution Bulletin by Dr. Melanie Bergmann, biologist and deep-sea expert at the Alfred Wegener Institute for Polar and Marine Research in the Helmholtz Association.

Polarstern is expected back from the Central Arctic expedition “IceArc“ in Bremerhaven on 8 October 2012 after a good two months. 54 scientists and technicians from twelve different countries conducted research on the retreat of the sea ice and the consequences for the Arctic Ocean and its ecosystems over a period of two months in the High North.

Water does not forget, says Prof. Boris Koch, a chemist at the Alfred Wegener Institute for Polar and Marine Research in the Helmholtz Association. Irrespective of what happens in the sea: whether the sun shines, algae bloom or a school of dolphins swims through a marine area – everything and everyone leaves biomolecular tracks. With the help of a combination of new techniques, Boris Koch and colleagues can now identify and retrace some of these.