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 the Junior [...] for polar marine food webs. 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 [...] waters, riverine input and marine 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

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 for [...] 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 and [...] than we do about the ocean depths. Yet the deep sea is not a habitat fully separated from the surface; it is already undergoing dramatic changes in response to warmer water, ocean acidification and en

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 ORCiD Alfred Wegener Institut Am [...] 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

and temporal variation in deep-sea 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, [...] biomass of three epibenthic 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 [...] assessing temporal variations in benthic community structure, megafaunal composition and diversity at the Arctic deep-sea observatory HAUSGARTEN between 2004 and 2015. Deep-Sea Research I 122: 81-94. Vedenin, A

insights into key 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 [...] Rinke . WP4. Arctic processes and O-A-I interactions in the coupled climate system Improved understanding of those key physical and chemical processes in the atmosphere, sea ice and ocean, and involved [...] involved interactions that play a major role in the coupled Arctic climate system and associated Arctic Amplification. AWI contribution led by Dr. Annette Rinke and Dr. Wolfgang Dorn . WP5. Antarctic processes

space in the Arctic Ocean and next steps towards its comprehensive monitoring. European Polar Science Week 2020. Virtual Internagtional Conference. 30 Oct 2020 2019 Bracher A. (2019) The Ocean as Seen by [...] 2023 Bracher A: (2023) Hijacking other thematic satellite sensors for ocean colour application" Keynote at 2023 International Ocean Colour Science Meeting, St. Petersburg, FL, USA, 15 November 2023 . Xi [...] (2015) Hyperspectral ocean color imagery and applications to studies of phytoplankton ecology. In Breakout session "Hyperspectral science and applications for shelf and open ocean processes" of IOCS 2015

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, we work with the krill species

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 island group Spitzbergen - and [...] 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 [...] Wegener Institute started its work in 1992. The scientific focus is the investigation of polar land-ocean-atmosphere linkages, complementing the marine and coastal research fields at the AWI sites in Bremerhaven

between atmosphere and ocean. This concerns both hemispheres since cold-air outbreaks occur in the Arctic and Antarctic as well. Typical regions for cold-air outbreaks in the Arctic are the Fram Strait and [...] of the lower atmosphere with sea ice and ocean is strongly influenced by processes caused by the surface morphology, which is characterized in the Polar ocean regions first of all by the sea ice cover [...] Polar Atmospheric Boundary Layer - Observations and Small Scale Modelling Temperature profiles over Arctic sea ice during summer. Boundary layer heights amount here to about 60 m (blue) and 500 m (red) (Graphic:

backbone of the Global Ocean Observing System (GOOS) is the Argo system, which uses an array of >3000 profiling floats (Figure 2). Until recently, Argo was restricted to ice free oceanic regions, as the floats [...] 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 ship-based expeditions [...] and deep-sea moorings, limiting our ability to monitor oceanic change at adequate resolution and over necessary periods in time and space. However, with the turn of the century, automated systems gained