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

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

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

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

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

marine organisms under pressure. However, jellyfish in the world’s oceans could actually benefit from the rising water temperatures – also and especially in the Arctic Ocean, as researchers from the Alfred [...] successfully shown. In computer models, they exposed eight widespread Arctic jellyfish species to rising temperatures, sea ice retreat and other changing environmental conditions. The result: by the second [...] potentially dramatic consequences for the marine food web and Arctic fish populations. The study was just released in the journal Limnology and Oceanography.

with respect to tipping points Horizon 2020: OceanNETs : Ocean-based Negative Emission Technologies - analyzing the feasibility, risks, and co-benefits of ocean-based negative emission [...] by Alkalinity Enhancement: Potential, Benefits and Risks BMBF nuArctic: Towards a better understanding of the nutrient cycles in the ‘new’ Arctic Ocean and implications for future primary productivity and carbon export OceanICU : OceanICU is a Horizon Europe project aiming to produce new data, information and understanding on the role of the Ocean in the

water input, which affects density and salinity layers of the ocean. Besides its direct climatic impact, the snow layer also adds to the uncertainty of sea ice thickness estimates by satellite altimeters [...] ice (Photo: Alfred Wegener Institut) We deploy snow buoys in the Arctic and Antarctic. They are equipped with echo sounders to record changes at the snow surface. Buoy data can be accessed via the

targets four events: heat waves, hydrological extreme events , ocean eddies and the thawing of permafrost . Hydrological extreme events Recent global projections predict a 10-20 % increase in the [...] and a large portion of the Siberian and North American shelves. Arctic warming occurs at a much higher rate (by up to 8 to 10 times) compared to the rest of the world. Warming permafrost thaws and degrades

Changing Arctic Carbon cycle in the cOastal Ocean Near-shore - CACOON No other region has warmed as much or as rapidly in the past decades as the [...] globally from land to ocean, despite the Arctic Ocean making up only approximately 1% of the Earth’s ocean volume. Arctic shelf waters are therefore dominated [...] on the type and fate of river-borne organic matter delivered to Arctic coastal waters, and the resultant changes to ecosystem functioning in the coastal Arctic Ocean. We will achieve this through a