Seismology in (sub)polar oceans Contact Prof. Dr. Vera Schlindwein Seismology in stormy oceans In the stormy „Furious Fifties“ we succeeded for the first time to recover ocean bottom seismometers after [...] when the ice cover is almost 100% (Expedition PS137 of RV Polarstern). The data show that the Arctic Ocean offers good recording conditions for earthquakes due to the unprecedentedly low seismic noise [...] originating at the Southwest Indian Ridge now provide unprecedented insight into the formation of new ocean lithosphere. Lucky OBS recovery in snowy darkness Getting help with OBS recovery Seismology under

collected data can be used, for example, to study changes in the freshwater content of the upper Arctic Ocean, as in the NORTHATLANTIC project. Together with higher-precision data from ship-based expeditions [...] drifting measurement platforms that record vertical profiles of water mass properties in the ice-covered oceans. The systems are moored on the ice and measure temperature, salinity, and pressure in the upper 800 [...] online. The deployment of these autonomous measuring systems is coordinated through the International Arctic Buoy Programme. Contacts Dr. Benjamin Rabe +49(471)4831-2403 Benjamin Rabe@awi. Dr. Mario Hoppmann

the Arctic Mediterranean. The Arctic Ocean freshwater budget The Arctic Ocean freshwater budget A particular feature of the Arctic Ocean is the enormous freshwater surplus. The upper Arctic Ocean receives [...] cover makes the Arctic Ocean distinct from subarctic oceans – the presence of ice, as well as ice formation and melt significantly shape the circulation and water masses of both the Arctic Ocean and the Nordic [...] Circulation in the Arctic Ocean and the Nordic Seas The Arctic Ocean and the Nordic Seas are integral parts of the Atlantic meridional overturning circulation, and hence key regions for the global climate

Greenland Ice Sheet Ocean Interaction Investigation of the Interactions Between the Greenland Ice Sheet and the Surrounding Ocean The joint research project GROCE ( Greenland Ice Sheet Ocean Interaction ) is [...] Atlantic, the Arctic Ocean, and Greenland's glaciers need to be studied in greater detail. More information can be found on the project's website. Schematic illustration of the key oceanic and glaciological [...] rapid inflow of warm Atlantic water beneath the glacier tongue. To record the heat transport into the ocean-filled glacier cavity throughout an entire year and observe potential seasonal variations, we deployed

ARCGATE The Arctic boundary has been observed over many years to better understand and monitor the exchanges between the Arctic Ocean and its neighboring oceans. The unique geometry of the Arctic—surrounded [...] Polarstern set sail from Tromsø to drift in the Arctic Ocean for a year—trapped in the ice. The goal of the MOSAiC expedition was to study the Arctic, the epicenter of global warming, more closely than… [...] Since the early 20th century hydrographic measurements have been carried out in the Arctic Ocean. Although today the Arctic is a hotspot of climate change, data sampling is still sparse due to the large sea

Observations in the Arctic Ocean The Arctic is an environment where global climate change is strongly manifested. The Arctic Amplification, represented by the atmospheric warming trend in the Arctic being about [...] Main Research Topics Physical Oceanography of the Arctic Ocean The Arctic Ocean and the Nordic Seas are integral parts of the Atlantic meridional overturning circulation, and hence key regions for the [...] the global climate. The perennial sea ice cover makes the Arctic Ocean distinct from subarctic oceans – the presence of… Find out more PhytoOptics Analytical bio-optical techniques are applied to extract

Tromsö Chief Scientist: R. Stein Cruise report Programme Weekly reports Data PS87 | ARK-XXVIII/4 | Arctic Ocean, Central Basin Start: 2014-08-05, Tromsö End: 2014-10-08, Bremerhaven Chief Scientist: R. Stein [...] Chief Scientist: R. Gersonde Cruise report Programme Weekly reports Data PS72 | ARK-XXIII/3 | Arctic Ocean Start: 2008-08-12, Reykjavik End: 2008-10-17, Bremerhaven Chief Scientist: W. Jokat Cruise report

ice influence the observed variability of Arctic and Antarctic sea ice? How do variations in melt and freeze rates impact the ocean and the atmosphere in the Arctic and Antarctic? What are the consequences [...] polar ocean due to Arctic sea ice retreat? We apply, improve, and develop various methods to study sea ice and snow processes in both hemispheres, including the interaction of atmosphere and ocean. Contact [...] are the reasons for the dramatic changes in Arctic sea ice during the last decades? Why is the development of sea ice in the Antarctic so different to the Arctic and shows strong regional differences? How

category of mid-ocean ridges, accounting for about 15% of the total length of mid-ocean ridges worldwide. Since ultraslow ridges are located in the Arctic Ocean and the stormy Southwest Indian Ocean and are therefore [...] Ultraslow spreading mid-ocean ridges At mid-ocean ridges, the lithospheric plates move apart at rates of about 5-150 mm/year and new oceanic lithosphere is continuously formed. At low spreading rates of [...] making its way to the ocean floor through a cold, thick lithosphere. Therefore, the formation process of new ocean lithosphere differs at ultraslow spreading ridges from all other ocean basins. Ultraslow ridges

stratification in the Arctic Ocean during the Miocene , arktos . doi: 10.1007/s41063-020-00079-8 Lohmann, G. , Knorr, G. , Hossain, A. and Stepanek, C. (2022): Effects of CO2 and Ocean Mixing on Miocene and [...] in the ocean model FESOM. The figure shows a land-sea configuration during the Middle Miocene (~15 million years ago) as incorporated in a complex Earth System Model. For example changes in oceanic gateways [...] between classic hypotheses for glaciations that involve e.g. tectonic changes and associated changes in ocean circulation or declining atmospheric CO 2 in combination with the Earth’s orbital configuration. Research