reproducing the observed Arctic circulation and sea ice development, which is partly due to shortcomings in the representation of physical processes governing air-sea ice-ocean interaction. The improved repr [...] the improved physical representation of polar air-sea ice-ocean interaction on the variability and changes of Arctic atmospheric circulation, Arctic sea ice and mid-latitude atmospheric circulation. Therefore [...] POLEX The linkage between POLar air-sea ice-ocean interaction, Arctic climate change and Northern hemisphere weather and climate EXtremes (POLEX) A Helmholtz - RSF Joint Research Group funded by the Helmholtz

low September sea ice extent years X. Yu et al. 14:30-14:45 WP2- AWI-AC: Simulated sea ice melt in summer and related atmospheric circulation patterns A. Rinke et al. 14:45-15:00 WP2-AARI: Sea-ice dynamics: [...] and interannual variability of sea ice thickness on Siberian shelves from satellites and moored sonars J. Belter et al. 13:30-13:50 WP1-AARI: Observed atmospheric and sea-ice changes and feedbacks: Svalbard [...] surface air temperature anomalies in Moscow in 1970–2016 under conditions of reduced sea ice area in the Barents Sea K.A. Shukurov, V.A. Semenov 16:40-16:55 WP3- IAPRAS: Comparison of temperature and c

abundance of small the deep-sea sediments at the HEBBLE site, zoobenthos around biogenic structures in tidal western North Atlantic. Deep-Ses Res sediments of the Wadden Sea Helgolände 33(6):755-790 M [...] of methane in the sea. Other key research areas are Hydrate Ridge (Cascadia Margin off Oregon, USA, Projects LOTUS and OMEGA, GEOMAR) and the methane seeps of the north-western Black Sea (Project GHOSTDABS [...] French ROV VICTOR 6000 first deployment from Polarstern. Sea Technology 4114: 51-53. Scientific Programmes The "Hausgarten" area - a long-term deep sea station in the Arctic Ocean La "Hausgarten" - observatoire

deep-sea floor. During the expedition ARK XXI with “Polarstern”, we deployed two deep-sea landers at 2500m and 5500m water-depth to allow comparisons of the changes in two totally different deep-sea habitats [...] sedimenting matter in the Greenland Sea.“ Journal of marine systems 5: 411-423. Gage, J. D. and P. A. Tyler (1991). Deep-Sea Biology: A natural history of organisms at the Deep-Sea floor, Cambridge University [...] disturbance for deep-sea biodiversity F. Gallucci, T. Soltwedel Exclosure experiments were conducted in situ at the deep-sea long-term station “HAUSGARTEN” to follow the development of deep-sea meiobenthic c

deep-sea long-term observatory HAUSGARTEN 4-25 4.4.4 Latitudinal shifts in deep sea nematode assemblages 4-28 4.4.5 Carbon remineralisation by the benthic community 4-28 4.4.6 Responses of deep-sea nematode [...] of deep-sea copepods in polar seas – speciation processes and ecological niches in the homogeneous environment of the pelagic realm” addresses biodiversity and feeding ecology of dominant deep-sea copepods [...] profilers from RD Instruments, temperature and salinity probes from Sea-Bird Electronics Inc. (Sea-Bird) and bottom pressure recorders from Sea-Bird. The western part of the array (4 tall rigs and 2 tube moorings)

meters. The operated CTD system was a Sea-Bird Electronics Inc. SBE 911+ system. The unit was equipped with sensors for temperature (Sea-Bird SBE03+), conductivity (Sea-Bird SBE04C) and pressure (Digiquartz) [...] the Arctic summer minimum sea ice area decreased by 10% per decade. In September 2007 and 2012, we faced new record minima of only ~4 Mio km2. At the end of the melt season, sea ice was ~40% below the long-term [...] ecosystem in the transition zone between the northern North Atlantic and the central Arctic Ocean, and to determine experimentally the factors controlling deep-sea biodiversity, the Alfred Wegener Institute He

(Comiso et al., 2008), whilst the summer sea ice extent has shrunk even more rapidly. According to the US National Snow and Ice Data Center (NSIDC), arctic sea ice during the 2012 melt season has reached [...] changes in the transition zone between the northern North Atlantic and the central Arctic Ocean, and to determine experimentally the factors controlling deep-sea biodiversity, the AWI established the LTER (Long-Term [...] surveys registering floating debris at the sea surface. During the second week of the cruise, we mainly operated in front of Kongsfjorden and off northeast and north Svalbard. Slightly impeded by the rather

ment reconstructions. His working areas are in the North Sea, Arctic and Antarctica. He spent considerable time on research vessels in the North Sea and the polar areas and 4 months in the Argentinian [...] key-players in the North Sea Office, in the interface of science and society. Dr. H. Christian Hass leads the coastal geology working group at the Alfred Wegener Institute, Wadden Sea Research Station in [...] Research interests: Hydro-climatic conditions of the North Sea system; Long-term variation of phytoplankton and hydro-chemical conditions in coastal seas; Experience in time series analysis and the assessment

ment reconstructions. His working areas are in the North Sea, Arctic and Antarctica. He spent considerable time on research vessels in the North Sea and the polar areas and 4 months in the Argentinian [...] key-players in the North Sea Office, in the interface of science and society. Dr. H. Christian Hass leads the coastal geology working group at the Alfred Wegener Institute, Wadden Sea Research Station in [...] Research interests: Hydro-climatic conditions of the North Sea system; Long-term variation of phytoplankton and hydro-chemical conditions in coastal seas; Experience in time series analysis and the assessment

Sea Ice
The Arctic sea ice continues to dwindle: Since the 1970s, when satellites first began monitoring the white sheet covering the Arctic Ocean, its February extent was never as small as it was this [...] which are not only hitting the Arctic more frequently, but are also intensifying and reaching farther north.