the Eurasian shelf seas. Ocean waters with salinities below the average salinity of the Arctic Ocean also contribute positively to the fresh water balance of the Arctic Ocean. Such waters flow in from [...] er-Institut) Figure 1: Surface circulation of the Arctic Ocean (Graphic: Alfred-Wegener-Institut) Figure 2: Mid-depth circulation in the Arctic Ocean, which is fed from the Atlantic. 129 Iodine releases [...] blue line shows the total Arctic (liquid + sea ice) freshwater content (integrated in the area in blue on the map) (Graphic: T. Kovacz, Alfred-Wegener-Institut) The Arctic Ocean receives freshwater by run-off

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 [...] the Arctic summer minimum sea ice extent in September from the beginning of the melting season in May/June on. While the strongest greenhouse gas induced changes are currently observed in the Arctic, it [...] 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 assimilation)

proxies TEXH86 and UK’37 Long-term winter warming trend in the Siberian Arctic during the mid- to late Holocene Back from Antarctica Ocean surface temperature variability: Large model–data differences at decadal [...] profiles Flat Meridional Temperature Gradient in the Early Eocene in the Subsurface Rather than Surface Ocean Layering of surface snow and firn at Kohnen Station, Antarctica - noise or seasonal signal? Assessing

the Changing Arctic Ocean programme is to understand how the changing physical environment will affect the large-scale ecosystem structure and biogeochemical functioning of the Arctic Ocean. The two key [...] field analysis in the Arctic Ocean . Arctic Special Issue, Phil Trans Royal Soc. (submitted) Literature: Castellani, G., M. Losch, B. A. Lange, and H. Flores (2017), Modeling Arctic sea-ice algae: Physical [...] applied to understand how the Arctic marine system will respond to ongoing changes that include thinning of sea ice, declines in nutrient inventories and freshening of Arctic Ocean surface waters. We will answer

suitable ice floe, where they will set up the research camp for their one-year-long drift through the Arctic Ocean. Consequently, one of the most important milestones in the expedition has been reached ahead of

concentrations at the ocean floor. Using model-based simulations, they have also found an explanation for this high level of pollution. According to their findings, the two main ocean currents in Fram Strait [...] Marine Pollution
Working in the Arctic Fram Strait, scientists from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) have found microplastic throughout the water column [...] microscopically small plastic particles into the region between Greenland and Spitsbergen from both the Arctic and the North Atlantic. While passing through the Strait, many particles eventually drift to the

is what made MOSAiC possible. MOSAiC – The largest Central Arctic expedition of all time. The icebreaker Polarstern will drift through the Arctic sea ice for a year to capture scientific data from the n [...] better understand- ing of truly fundamental processes, like the nature of energy flows in the Arctic, how Arctic clouds func- tion, and how life below and with- in the ice changes throughout the year. But [...] saved. On the same day the Fram managed to free herself from the ice, after drifting across the Arctic Ocean for 35 months. (mw) Link to MOSAiC app Printed by: BerlinDruck GmbH + Co KG 100 % chlorine-free

forward to continuing the one-year-long MOSAiC expedition and its research on the ocean, ice and atmosphere in the Arctic. Earlier this week, their predecessors from Leg 3 returned to Bremerhaven on board

icebreaker Polarstern has been drifting through the Arctic Ocean for a year since autumn 2019. Scientists from 20 nations explore the central Arctic over the course of the year on the MOSAiC expedition [...] It goes without saying that the waters of the outer Arctic ice aren’t subject to the same pressure as in the inner ice, let alone the Central Arctic; the floe dimensions are on a different scale, too.

Anniversary
40 years of research in the Arctic, Antarctic and in coastal regions: on 15 July, the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) celebrates its 40 th [...] and internationally recognised centre for climate research in the two polar regions and the world’s oceans.