the vast exchange of water between the deep ocean and the sea surface that is unprecedented in the global ocean elsewhere. Over past decades, the Southern Ocean has substantially slowed global surface warming [...] Low-salinity water in the Southern Ocean kept CO₂ locked… Low-salinity water in the Southern Ocean kept CO₂ locked away for decades - New study reveals an overlooked oceanic carbon storage mechanism. Find [...] Postdoc My aim is to better understand the ocean carbon sink and its changes, with a special focus on the Southern Ocean. I study how the physics of the ocean impact the return pathways of CO 2 to the surface

Polarstern returns from the “Trans-Arctic Survey of the Arctic in Transition” (TransArc) expedition, intended to record physical, biological and chemical changes in the Arctic Ocean. One highlight of the expedition: [...] 2012-10.2012 – During the Polarstern’s 27th stay in the Arctic and in the context of the “Sea ice - ocean - seafloor interactions in the changing Arctic” (IceAr) expedition, e.g. long-term changes in this [...] on yet another Arctic expedition – its 29th. The expedition, officially designated “Transitions in the Arctic Seasonal Sea Ice Zone” (TRANSSIZ), was planned by the international “Arctic in Rapid Transition”

European coastline. The project belongs to the EU Mission Restore our Ocean and Waters, and is a member of the Lighthouse for the Arctic and Atlantic Basin. Innovative solutions for marine restoration will [...] will be demonstrated in five different environments across a latitudinal gradient, from the high-Arctic Svalbard at 79°N to the Madeira archipelago at 33°N. CLIMAREST will be developed on a latitudinal gradient

and Technology, and the PEBCAO Group (Phytoplankton Ecology and Biogeochemistry in the Changing Arctic Ocean) at AWI and the Helmholtz Young Investigators Group SEAPUMP (Seasonal and regional food web i

a seismic station on sea ice Seismic station installed on drifting sea ice In the ice-covered Arctic Ocean we also use seismic land stations deployed on drifting ice floes to record small earthquakes.

sea surface temperature observations to constrain upper ocean properties in an Arctic sea ice-ocean data assimilation system. J. Geophys. Res. Oceans , 124, 4723-4743, doi:10.1029/2019JC015073 Pradhan, H [...] unstructured-grid ocean model under Earth System Modeling Framework, Ocean Modelling , 102546, ​ doi:10.1016/j.ocemod.2025.102546 . Bunsen, F. , J. Hauck, L. Nerger , S. Torres-Valdés. (2025) Ocean carbon sink [...] (2018) Arctic-wide sea-ice thickness estimates from combining satellite remote sensing data and a dynamic ice-ocean model with data assimilation during the CryoSat-2 period. J. Geophys. Res. Oceans , 123

the thickness of the Arctic sea ice is steadily declining and meltwater pools are increasingly forming in summer, covering large areas of the Arctic sea ice, both the ice and the ocean below absorb more solar [...] between the ocean and atmosphere sea ice modulates the flow of energy, kinetic force, salt, moisture and trace gases between the two components. Though our knowledge of the sea ice in the Arctic and Antarctic [...] data are needed in order to validate our computer models and depict the realities of sea ice in the Arctic and Antarctic as precisely as possible using computers. If we succeed in this detail work, we’ll

coupled Arctic climate system with the overall aim to (i) improve our understanding and model representation of key climate processes in the Arctic and (ii) to improve our understanding of Arctic – midlatitude [...] the observed drastic Arctic climate changes and the uncertainty in Arctic climate projections is large. That arises, in large part, from gaps in our understanding of key Arctic processes and feedbacks [...] national and international research projects, such as AC3 , REKLIM , Arctic CORDEX , PolarRES , and WarmWorld . Background The phenomenon of Arctic amplification has a suite of causes, which include various i

Due to intensifying sea-ice melting in the Arctic, sunlight is now penetrating deeper and deeper into the ocean. Since marine zooplankton respond to the available light, this is also changing their behaviour

the Alfred Wegener Institute’s flagship has successfully completed more than 130 expeditions to the Arctic and Antarctic and offered a temporary home for thousands of researchers from Germany and around the [...] safely traversed 1.8 million nautical miles. The ship is currently on an expedition in the Southern Ocean.