Threshold in North Atlantic-Arctic Ocean circulation controlled by the subsidence of the Greenland-Scotland Ridge , Nature Communications, 8 (15681), pp. 1-13, doi: [...] , R., Fahl, K., Gierz, P. , Niessen, F. and Lohmann, G. (2017): Arctic Ocean sea ice cover during the penultimate glacial and the last interglacial , Nature Communications, 373, doi: 10.1038/s41467-017 [...] 2016), Evidence for ice-free summers in the late Miocene central Arctic Ocean , Nature Communications, 7, pp. 1-13, doi: 10.1038/ncomms11148 . Abelmann, A., Gersonde, R. , Knorr, G. , Zhang, X. , Chapligin

to investigate impactsof past and future climate changes in the Arctic. Since permafrost is usually not visible at the earth’s surface and only few measurement sites exist, models are also important to [...] , permafrost models give us insights into the evolution of Arctic landscapes and help us understand how these unique ecosystems respond to natural and human-caused disturbances. Permafrost models [...] interactions between permafrost, vegetation, snow, lakes, and the Arctic ocean. Furthermore, we use our models to gain insights into important ecosystem functions such as the water and carbon cycles. We

returned to their home countries, while the others moved on to the Arctic, the Antarctic, Canada, Australia, the Netherlands or Ireland, and some stayed in Germany at the AWI or other marine research [...] Observation of the Global Ocean (POGO), and State Secretary Mario Brandenburg of the Federal Ministry of Education and Research. Three former participants of the [...] future - as researchers and as people who are committed to our oceans in times of climate change. Pedro Montoro (alumni) I am Pedro Montoro, originally from Cuba and attended the NF-POGO Centre of

Wegener Institute has operated a long-term observatory in the Arctic deep sea: the HAUSGARTEN. Located between Greenland and Svalbard, it is where researchers investigate natural and climate-change-related changes in a polar, marine ecosystem – from the ocean’s surface to the seafloor, 5,500 metres below. Many of the observatory’s stations are located below the sea ice, while its autonomous

algae Lake & Sea-ice algae The seasonal extent and properties of Arctic ice on land and in the ocean determine the efficacy of the albedo feedback mechanism causing arctic climate amplification. Various [...] past and present relationships between climate changes in the Arctic and ecosystem dynamics in northern lake systems, by developing a data analysis system designed for multivariate statistics on lake [...] dynamics of the past, present and future. . Research focus: Arctic Lake System Dynamics (Topic A) High-latitude Vegetation Change (Topic B) Contact: Boris Biskaborn, Ulrike Herzschuh , Bernhard

scales of phyoplankton activity (Graphic: Phytochange) Focus – The Arctic is warming faster than any other oceanic region of the planet and its sea-ice cover is declining faster than models predict. Due to [...] in sea-ice cover and stratification, the productivity in the Arctic Ocean may transition from being predominantly light-controlled to being more nutrient-controlled. Also, the phenomenon of ocean [...] observatory 'Hausgarten' in the Fram Strait, which connects the Arctic and the Atlantic Ocean. Different from the shallow Aleutian connection to the Pacific, this connection is 5569 meters deep, making

10.1016/j.tecto.2017.02.012 Corela et al., 2023: The effect of deep ocean currents on ocean- bottom seismometers records, doi: 10.5194/nhess-23-1433-2023 Czuba et al., 2011: Continent-ocean-transition across [...] Logachev Seamount: Indicator for melt focusing at an ultraslow mid-ocean ridge?, doi: 10.1002/grl.50329 Schlindwein et al., 2014: Seismicity of the Arctic Mid-Ocean Ridge system, doi: 10.1016/j.polar [...] al., 2017: Magma plumbing system and seismicity of an active mid-ocean ridge volcano, doi: 10.1038/srep42949 Schweitzer et al., 2021: A 24‐Yr‐Long Seismic Bulletin for the European Arctic, doi: 10.1785

of an international study that investigated the development of Arctic microalgae at the end of the polar night. The measurements were carried out as part of the MOSAiC expedition at 88° northern latitude [...] in the microalgae's habitat under the snow and ice cover of the Arctic Ocean. The results of the study now published in the journal Nature Communications show that photosynthesis in the ocean is possible

research ship Healy and the icebreaker Oden in the middle of the Arctic Ocean: at 85° 30 N and 015°00’ E over the Gakkel Ridge. Aerial view of RV Polarstern (Photo: Alfred-Wegener-Institut) Operations [...] research vessel Healy and the icebreaker Oden in the middle of the Arctic Ocean at 85° 30 N and 015°00‘ E over the Gakkel Ridge. 2004-2005 – In the framework of the ice station Polarstern experiment the [...] . 06.2012-10.2012 – 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

energy budget and the biological activity in the ice & the upper ocean. Radiation stations determine the fraction of incident light which is reflected by the surface or transmitted through ice & snow. [...] environmental change. The towed high resolution camera system OFOS (Ocean Floor Observing System) is used to index megafauna and plastic litter on the Arctic sea floor. ROV To observe the sea-ice system [...] Platform Sinking particles control CO2 transport to the deep ocean. AWI and MARUM researchers developed the BioOptical Platform BOP, which combines a camera system and gel traps to differentiate