SIT bias impacts Arctic circulation wCDA of ocean hydrography: 30 members, monthly assimilation, 1980-2010 Constrained ocean hydrography reduces bias(SIT) ! Upper ocean: fresher Upper ocean: more saline + [...] skill? ice+ocean DA Strongly enhanced skill in melting season + sCDA of SIC: Is assimilation of ocean data helpful in the Arctic Basin? Is assimilation of ocean data helpful in the Arctic Basin? 23 May [...] Nordic Seas 2) Arctic basin The role of ocean and sea ice initialisation in the coupled Earth system OHT & winter SI May SIT & Sep SIC 11 1) Nordic Seas 2) Arctic basin The role of ocean and sea ice in

Observing System ( ArcticROOS ) working with ocean observation and modelling systems for the Arctic Ocean and adjacent seas has been established within the EuroGOOS initiative. ArcticROOS will promote, develop [...] only open-ocean LTER site. LTER-D is a member in the international LTER umbrella organisation ILTER and in the European regional network LTER-Europe. Contact: T. Soltwedel ArcticROOS (Arctic Regional Ocean [...] Ocean Observing System) Project within the GOOS/EuroGOOS initiative Since 2006 Coordinator: Stein Sandven, Nansen Environmental and Remote Sensing Center (NERSC), Norway An Arctic Regional Ocean Observing

the Arctic Ocean. Stratification If freshwater enters the Arctic Ocean via rivers, preci- The consequences of climate change for the Arctic Ocean pitation or melting sea ice, it alters the ocean’s surface [...] definition. (Photo: Sebastian Menze/AWI) The Arctic Ocean The Arctic is, in contrast to the Antarctic, not a continent. Rather, it stretches across a central ocean that is surrounded by the northern edges [...] bottom of the Arctic Ocean. The currently known species include 366 different arthropods, 197 Fora- minifera species as well as 194 annelid and 140 ne- matode species. What lives in the Arctic Ocean and what

matter within the rivers and oceans would allow to better assess the export, transformation and fate of tDOM (the largest fraction of dissolved carbon in the Arctic) in the ocean. Colored or chromophoric dissolved [...] supplied by Arctic rivers, which account for more than 10% of the total riverine and terrestrial organic carbon into the global ocean waters (Opshal et al., 1999; Benner et al., 2004). Most of the Arctic outflow [...] outflow and, as a consequence, the total carbon mobilized into the Arctic Ocean, leave the Arctic basin via the Fram Srait, following the East Greenland Current (EGC) and through the Davis Strait within the

Central Arctic Ocean - Rapp, J.Z. - 2018 - Frontiers in Microbiology Algal Colonization of Young Arctic Sea Ice in Spring - Kauko, H.M. - 2018 - Frontiers in Marine Science Polar solar panels: Arctic and Antarctic [...] in the central Arctic Ocean during the record sea-ice minimum in 2012 - Fernández-Méndez, M. - 2015 - Biogeiosciences An assessment of phytoplankton primary productivity in the Arctic Ocean from satellite [...] Central Arctic Ocean - Fernández-Méndez, M. - 2014 - PLoS ONE Floating ice-algal aggregates below melting Arctic sea ice. - Assmy, P. - 2013 - PLoS ONE Export of Algal Biomass from the Melting Arctic Sea Ice

production. In addition, ocean warming is leading to changes in the winter mixed layer in the North Atlantic, which has reduced the amount of silica entering the Arctic Ocean in recent decades. This will [...] the consequences of silica decline for the Arctic marine ecosystem and the mechanisms responsible. To understand how climate change affects the Arctic Ocean, we will combine novel and classical approaches [...] Group Silicic acid Decline Effect on Marine Arctic Ecosystems SideEFFECT (Graphic: Mar Fernández-Méndez) Human-induced climate change is altering the ocean on a previously unimaginable scale. One of the

COP 29 Find out more UN Decade of Ocean Science Find out more MOSAiC expedition: one year in the Arctic Ocean Find out more UN Agreement for the Protection of the Ocean Find out more 15 years of Neumayer [...] Antarctic. Two new publications by the Arctic Office 16. April 2025 The German Arctic Office published a policy brief entitled “Reception of Germany’s new Arctic Policy Guidelines (2024)”, which deals [...] perception and implementation of the new German Arctic Guidelines in the Arctic states. Another publication is the fact sheet called “Remote Sensing in the Arctic”. It explains the importance and applications

more dynamic Arctic sea ice and larger open ocean areas increase the complexity of accurately predicting the transport pathways and impacts of various pollutants in the Arctic environment. These pollutants [...] project we will simulate the oceanic advection of pollutants from their sources with a global version of the sea-ice-ocean model FESOM2 with about 7 km spatial resolution in the Arctic and Nordic Seas. Atmospheric [...] relevant to Arctic ecosystems. . The sea ice-ocean model FESOM2 will be coupled with the atmospheric chemistry transport model DEHM (Danish Eulerian Hemispheric Model), thus connecting the ocean and atmospheric

the Arctic environment? What changed in the Arctic over the last decades? What is permafrost? How does thawing permafrost affect the Arctic environment? How does thawing permafrost affect Arctic infr [...] explore the conflict of interests of different Arctic stakeholders. Lesson Plan Permafrost in the Arctic Living in the wild North The Permafrost Risk The Ocean Race Summit Dr. Rebecca Rolph was an invited [...] all-hands-on-deck meeting at the Ocean’s Race, an organization holds sailing races around the world. The Ocean’s Race has a growing interest in promoting sustainability and ocean conservation practices, and

Arctic sea ice: a chain reaction Dr Thomas Krumpen, sea ice physicist and expert for satellite analyses at the Alfred Wegener Institute. Sea ice Application of satellite data Arctic Ocean IceBird For the [...] AWI are exploring the thickness and surface conditions of Arctic sea ice. We measure both properties in several key regions of the Arctic Ocean with autonomous buoys, on helicopter and aircraft measurement [...] important reference data set on the development of Arctic sea-ice cover worldwide. Those surveys indicate that the thickness of sea ice leaving the Arctic Ocean towards the North Atlantic has steadily decreased