in the Arctic is expected to rise due to the increase in available light as the sea ice melts, however the role of nutrient limitation is less understood. The inflow of silicic acid into the Arctic Ocean [...] biomass was actively taking up nutrients (Fig. 4). Light limitation is a key driver of central Arctic Ocean primary productivity, regulating C and N uptake, with increasing light being a potential stimulant [...] Impact of sea ice decline and changing silicic acid availability on Central Arctic primary productivity Antonia Thielecke1, Jeffrey Krause2, Natasha Bryan1, Lena Eggers1, Mar Fernández-Méndez1 1Alfred

Developing a Novel Methodology to investigate Diatom Silicification in the Eurasian Basin of the Arctic Ocean using Imaging Flow Cytometry and PDMPO natasha.bryan @ awi.de Alfred Wegener Institut Am Handelshafen [...] E-1015 Overview of Doctoral project Phytoplankton communities living inside and below sea ice in the Arctic and the Antarctic arefacing rapid changes due to ongoing climate change. Light and nutrient availability [...] polar phytoplankton composite images obtained with the multispectral Imaging Flow Cytometer? How do Arctic phytoplankton communities differ from Antarctic communities in terms of their species composition

analyses is to determine how much carbon the ocean removed from the atmosphere and stored in its depths in the past. The permanently frozen soils of the Arctic store tremendous amounts of carbon in the form [...] not consumed by marine animals, including dead marine microorganisms, material transported to the oceans by rivers –the particles that trickle down are deposited layer by layer at depth. Ultimately, a unique [...] deposited on the seafloor, leaving clues that enable the AWI geoscientists not only to reconstruct the Arctic’s climate history, but also to understand the role of thawing permafrost in past climate changes.

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

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.

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 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

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

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”