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)

photoperiod. Some of the key species we work with in the Southern Ocean are krill, specifically Antarctic krill, Euphausia superba and the gelatinous pelagic tunicate Salpa thompsoni . In the Arctic Ocean

(2020) Challenges to monitor biogeochemistry from space in the Arctic Ocean and next steps towards its comprehensive monitoring. European Polar Science Week 2020. Virtual Internagtional Conference. 30 [...] Community Structure from Ocean Colour: Methods, Validation, Intercomparisons and Applications”, International Ocean Color Science (IOCS) Meeting, Darmstadt, 8 May [...] , P. P., Heim, B., Bracher, A. (2008). The Eroding Coast, MORSE Arctic Coastal Initiative of the Canadian and European Space Agencies (CSA, ESA), Institute of Ocean Technology, St. John’s, Newfoundland

). The scientists in Potsdam carry out expeditions to the Arctic and Antarctic. They are mainly devoted to Arctic research - in particular in the permanently frozen areas of Siberia and the Arctic [...] predict the effects of future interventions in the system. German Arctic Office Since 2017, the German Arctic Office at AWI Potsdam serves as an information and cooperation platform for German stakeholders invested in Arctic science, politics and industry. It enhances the visibility of Germany's engagement in the Arctic on a national and international

local-regional scale physical and chemical processes for atmosphere-ocean-ice interactions in the Arctic and Antarctic, their responses to, and influence on, projected changes in the global circulation and [...] projected changes in the global circulation on the climate of the Arctic and Antarctic. Polar climates in a global context remains poorly understood and thus climate change projections in Polar regions [...] in the atmosphere, sea ice and ocean, and involved interactions that play a major role in the coupled Arctic climate system and associated Arctic Amplification. AWI

meiofauna at the LTER Observatory HAUSGARTEN in Fram Strait (Arctic Ocean). MDPI - Diversity 12 (7). doi: 10.3390/d12070279 Käß, M., Vedenin, A., Hasemann, C., Brandt, A., Soltwedel, T. (2019). [...] invertebrates from the deep-sea observatory HAUSGARTEN (Fram Strait, Arctic Ocean). Marine Ecology-Progress Series 602: 15-29. Grzelak, K., Kotwicki, L., Hasemann, C., Soltwedel, T. (2017): Bathymetric patterns [...] ): The interannual variability of megafaunal assemblages in the Arctic deep sea: preliminary results from the HAUSGARTEN observatory (79°N). Deep-Sea Research I 58: 711‑723.

specially adapted biotic community. Ice-covered seascape in the Arctic Ocean (Photo: Esther Horvath) The deep sea in the polar regions In the Arctic, living at the bottom of the sea poses unique challenges [...] standards. For another, food is harder to come by. The central Arctic Ocean is largely covered with ice and – unlike the Antarctic’s Southern Ocean – surrounded by landmasses. Exchanges with the Atlantic [...] place via two comparatively narrow passages. As a result, the Arctic Ocean is an extremely nutrient-poor one, where less algae grows than in the waters of the temperate latitudes – which also means

Double-Trouble Resilience and vulnerability of the central Arctic Ocean food web to cumulative stress by warming and anthropogenic pollution. Head of Group Dr. Doreen Kohlbach Further members of [...] Previous research suggests that pelagic food webs in the Central Arctic Ocean (CAO) are highly dependent on ice-associated food sources (Fig. 1), but how prevailing trophic structures will change with [...] traffic will bring more anthropogenic pollutants, even to remote Arctic regions, where they are entrained in water and sea ice, and transferred along the marine food chain. Figure 1. Carbon flow in polar

. However, this approach neglects all feedbacks of the sea ice-ocean system on the atmosphere. Since 2015 the initial state of the sea ice-ocean model is constrained by sea ice observations (data [...] und Gerdes, R., 2019a: Simultaneous Parameter Optimization of an Arctic Sea Ice–Ocean Model by a Genetic Algorithm, doi.org/10.1175/MWR-D-18-0360.1 Sumata, H., Kauker, F., Karcher, M. und Gerdes, R., 2019b: Covariance of Optimal Parameters of an Arctic Sea Ice–Ocean Model, doi.org/10.1175/MWR-D-18-0375.1

investigate Diatom Silicification in the Eurasian Basin of the Arctic Ocean using Imaging Flow Cytometry and PDMPO natasha.bryan @ awi.de ORCiD Alfred Wegener Institut Am Handelshafen 12 27570 Bremerhaven [...] 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 as well as shifts in grazing [...] obtained with the multispectral Imaging Flow Cytometer? How do Arctic phytoplankton communities differ from Antarctic communities in terms of their species composition, silicification degree and mixotrophy