temperatures from Boike et al. (2015). 3 Study area 3.1 The Lena River delta At its mouth in the Laptev Sea, the Lena River forms one of the largest deltas in the Arctic, covering around 25 000 km2. Continuous [...] delta was created in a continental setting before and during the transi- tion to the Holocene when the sea level was lower and the gradient of the Lena River steeper than today. It therefore features coarse-grained [...] qualitative way. The site has experienced significant warm- ing most likely related to changes in the sea ice conditions in the past 50 years, and Günther et al. (2015) document ground subsidence rates of

Longest-lived non-colonial animal known at present. Ò It inhabits coastal waters in the North Atlantic Ò In the North Sea and Norwegian waters it occurs from 53º30’N to 71ºN. Ò Its growth lines are widely used [...] RESEARCH PROVIDES: Ò Real time gaping activity patterns of Arctica islandica in the south eastern North Sea. Ò Information about the variability in the activity between individuals and seasons and shorter [...] line utilization for retrospective studies in palaeoceanography. 1. NIOZ; Netherlands Institute for Sea Research Rob.witbaard@nioz.nl 2. AWI Centre for Scientific-Diving & in situ Ecology Philipp.fischer@awi

most important connections between the Arctic Ocean and the North Atlantic. In the past few years, we’ve seen a major decline in Arctic sea ice in the region. In addition, more warm and salty water is [...] extreme storms and changes in sea ice. Right now, I’m working with a regional climate model for the Arctic. The model consists of several components: the atmosphere, sea ice, ocean and land. Simulations [...] system components. For instance, we’ve recently begun using ice sheet models that provide insights into sea level variations. What fascinates me most are the feedback loops in the Earth system. Models allow

creating user conflicts. The mooring of aquaculture facilities under the rough conditions in the North Sea is extremely costly. The high investment costs for such facilities would potentially make an ec

coastal regions north of Siberia, microorganisms produce methane when they break down plant remains. If this greenhouse gas finds its way into the water, it can also become trapped in the sea ice that forms

Oldenburg and Potsdam, Germany have confirmed the existence of a new cryptic amphipod species in the North Sea. For the first time for the description of a new species, they used a level of mitogenomic information

BFN ) RESTORE - Restoration of the stocks of the European oyster (Ostrea edulis) in the German North Sea. 2017 - ongoing ( NIOZ & AWI & Jericho NEXT / COSYNA ) ReMoBiB - Real time Monitoring of Bivalve [...] fully automatted year-round operation of a new generation of optical zooplancton recorder in the North-Sea. 2015 -ongoing ( HZG & AWI) Testing active sampling devices for costal heavy metal pullution. 2014 [...] 2012 - ongoing ( HZG & AWI & 4H-Jena ) COSYNA - Coastal Observing System of the Northern and Arctic Seas. 2011 ( MARUM & AWI & COSYNA ) SedObs - Comparative tests with respect to studying the near-surface

regions. In Europe, native oysters once formed extensive beds and reefs along North Atlantic coastlines and in the North Sea, even in offshore regions of moderate depth. However, over 90% of former oyster [...] recommendations with the aim to provide a healthy and resilient ecosystem in the North East Atlantic and the North Sea. Participants and members of the Native Oyster Restoration Alliance (NORA) agreed [...] provide the dominant struc- tural component and significant vertical relief on otherwise unstructured sea-floor. As an ecological keystone-species it offers substrate, spawning ground, food and shelter for

North Sea ecological time series (LTER) Sampling locations for the AWI's North Sea time series managed by teams in Helgoland, Sylt and Bremerhaven (Bremerhaven stations marked in yellow) Just as the physical [...] Long-term change in the copepod community in the southern German Bight. Jornal of Sea Research 101:41-50. North Sea Benthos: Künitzer, A. , Basford, D. , Craeymeersch, J. A. , Dewarumez, J. M. , Dörjes [...] projects and Boards and organizations such as ICES and SCOR. Important publications for some key AWI North Sea time series: Helgoland Roads phytoplankton: Wiltshire, K. H., A. Kraberg, I. Bartsch, M. Boersma

Expeditions Moderator D. Bolshiyanov 11:30-11:50 Heidemarie Kassens Russian-German project System Laptev Sea 11:50-12:10 Hans-Wolfgang Hubberten, Dmitry Bolshiyanov, Mikhail Grigoriev, Eva- Maria Pfeiffer, Volker [...] Bolshiyanov, Hans- Wolfgang Hubberten Initiation of terrestrial research in the Lena Delta and Laptev Sea coastal region and implementation of the Research Station Samoylov 12:30-12:50 Igor Yeltsov, Mikhail [...] hydrochemistry of the Lena River delta 13:20-13:40 Iuliia Shevstova Upscaling of above ground biomass of North- Eastern Siberia 13:40-14:00 short KoPf poster presentations (2 min, 2 slides) Moderator E-M. Pfeiffer