. Hoppe, L. Wu, G. Lohmann, 2025: The changing nature of future Arctic marine heatwaves and its potential impacts on the ecosystem. Nature Climate Change, doi.org/10.1038/s41558-024-02224-7 2024 [...] Oliveira RS, Campos MC, Shi X, De Oliveira PE, 2014: Slowdown of ocean circulation increases the vulnerability of northern Amazon forests. Nature Geoscience 2024. DOI: 10.1038/s41561-024-01578-z Ma, Q. [...] , X. Gong, P. Gierz, C. Stepanek, L. Stap, 2021: A salty deep ocean as a prerequisite for glacial termination. Nature Geo, 14, 930–936. doi:10.1038/s41561-021-00857-3 Selected book publications Lohmann

long-term measurements in Antarctica, ( Neumayer_III ), in the Arctic (AWIPEV ) and on the oceans ( Polarstern ) automatic weather stations (AWS) are in use. The numbers of the AWS-systems and their

Dr. Stijn De Schepper What are the global impacts of an ice-free Arctic? How will the Arctic develop with increasing climate warming? What does an ice-free Arctic mean for our environment and our society [...] as the surface uplift of the Andes, but also by changes in the oceanic circulation of the adjacent Pacific Ocean. The timing, forcings, and feedbacks of land-ocean coupling and their impact on the past [...] regional monsoons. Contact: Jian Shi Changes of water isotopes in Arctic Sea ice, Ocean and atMosphere (CiASOM) The MOSAiC drift experiment offered the unique possibility to tackle the main hydrological

Earth System Model. For example changes in oceanic gateways such as the Pacific-Atlantic connection and the Atlantic-Indian Ocean gateway via the Mediterranean are thought to represent [...] establishment of a modern-like three-layer 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 Pliocene Temperature Gradients , Paleoceanography and Paleoclimatology, 37 (2) . doi: 10.1029/2020PA003953

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 [...] ridges worldwide. Since ultraslow ridges are located in the Arctic Ocean and the stormy Southwest Indian Ocean and are therefore fairly difficult to reach, the spreading processes of this distinct [...] seismic activity of the Arctic Ridge System. We are particularly interested in the interaction of ocean and lithosphere at the enigmatic hydrothermal vents of the

the following: What 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 [...] How does snow on sea 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? [...] the environment by increasing commercial activities of the 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

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 Cruise report Programme Weekly [...] 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 Programme Weekly reports

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 [...] for 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 [...] the attribution of… Find out more Long-term Observations in the Arctic Ocean The Arctic is an environment where global climate change is strongly manifested. The Arctic Amplification, represented by the

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 ice cover. Yet both the historical and the… Find out more 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 by the land masses of North America, Greenland and… Find out more Arctic Long-term

GROCE - 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 a research initiative funded by the German Federal Ministry of Education and Research, involving eight German [...] achieve this, the interactions connecting the North 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.