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

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

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

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

. 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

Technology and Logistics Observations of the ocean’s temperature and salinity at different locations and depths – key parameters to assess its state - depended until recently on [...] restricted to ice free oceanic regions, as the floats needed to surface regularly to be localized and to transmit its data. The Hybrid Antarctic Float Observing [...] 6. Photo of an ice-resiliant Argo float surfacing the Antarctic Ocean in December 2008. (Photo: Alfred-Wegener-Institut)

current long-term observations Atlantic Water is the main oceanic source of heat, salt, and nutrients of the Arctic Ocean. It enters the Arctic Ocean through the Barents Sea or Fram Strait. In the [...] Strait on timescales of several months while the rest enters the Arctic Ocean and follows a cyclonic circulation for years to decades. The AWI long-term observations in Fram Strait have been measuring [...] events occurred in fall 2006 and in late winter 2012. In the deep ocean, it was also observed that the two water masses present there (the warmer Eurasian Basin Deep Water and the colder Greenland Sea

Central Arctic long-term observations [Translate to English:] Anomalies of annual mean liquid freshwater content in the upper Arctic Ocean basin [...] practical salinity of 35. The linear trend is 600+-300 The central Arctic is an important component of the global climate system, not only by atmospheric teleconnections but also by links in ocean circulation [...] overturning may be affected by the release of freshwater from the Arctic reservoir. Long-term observations in the Arctic Ocean by a multitude of observational platforms allow estimates of annual mean liquid

Long-term observations in the Arctic Ocean Schematic of ocean circulation between the Arctic and neighbouring oceans: warm water paths (red), cold/fresh polar water [...] of water masses and circulation in the Eurasian Basin of the Arctic Ocean from the 1990s to the late 2000s ,OS Special Issue: Ice-Atmosphere-Ocean interactions in the Arctic Ocean during IPY: the [...] awi.de Fram Strait / West Spitsbergen Atlantic Water is the main oceanic source of heat, salt, and nutrients of the Arctic Ocean. It enters the Arctic Ocean through the Barents Sea or Fram Strait. In the

Climate Modelling We investigate the coupled Arctic climate system with the overall aim to (i) improve our understanding and model representation of key climate processes in the Arctic [...] of key Arctic processes and feedbacks. A large body of evidence demonstrates how changes in the Arctic climate influence weather and climate at [...] in atmosphere, sea ice, and ocean, which are involved in interactions that play a major role in the coupled Arctic climate system. On the one hand, we apply the