of sea ice retreat on the entire ocean system from the surface to the deep sea. Eleven years ago, Antje Boetius was part of the largest ever sea ice minumum in the Arctic and its consequences for life in [...] the North Pole. For two months, a good fifty scientific expedition participants will explore the Arctic in transition as sea ice extent reaches its annual minimum in September. They will explore the biology [...] in the deep sea. Now she is returning with her team to compare the state of the Arctic today - also with the data from the MOSAiC expedition 2019/20.

deep Arctic Ocean. Deep-Sea Research I 73(3): 31-45. Freese, D., Schewe, I., Kanzog, C., Soltwedel, T., Klages, M. (2012): Recolonisation of new habitats by meiobenthic organisms in the deep Arctic Ocean: [...] small benthic biota to decreasing food availability, which is a common scenario for the changing Arctic Ocean, we installed cages (2 x 2 m in dimension, 50 cm in height) at the deep seafloor (2500 m water [...] (2009): Response of benthic microbial communities to chitin enrichment: an in-situ study in the deep Arctic Ocean. Polar Biology 32(1): 105-112. Gallucci, F., Fonseca, G., Soltwedel, T. (2008): Effects of megafauna

feedbacks between ocean structure and dynamics, sea ice physics, biogeochemistry, and biodiversity of the Arctic Ocean. Organic compounds in the Arctic Ocean and the deep Atlantic Ocean are derived from [...] elucidate, if the amount of dissolved organic compounds in the Arctic Ocean changed over the last decades. We also aim at quantifying the contribution of terrestrial organic matter because it represents [...] the effect of global warming on the occurrence of toxic microalgae and phycotoxins in the Arctic. The Arctic region is heavily impacted by global warming, which has an influence on the growth of planktonic

Tromsö Chief Scientist: R. Stein Cruise report Programme Weekly reports Data PS87 | ARK-XXVIII/4 | Arctic Ocean, Central Basin Start: 2014-08-05, Tromsö End: 2014-10-08, Bremerhaven Chief Scientist: R. Stein [...] Chief Scientist: R. Gersonde Cruise report Programme Weekly reports Data PS72 | ARK-XXIII/3 | Arctic Ocean Start: 2008-08-12, Reykjavik End: 2008-10-17, Bremerhaven Chief Scientist: W. Jokat Cruise report

fluxes in ice covered oceans (Photo: Stefanie Arndt, AWI) The radiation budget of sea ice dominates the sea-ice energy balance and the exchange of energy between the atmosphere and the ocean in ice-covered regions [...] comprehensive data sets from remote regions of the Arctic and Antarctic. Contact: Dr. Marcel Nicolaus Dr. Ran Tao Surface albedo of ice-covered regions in the Arctic and Antarctic mostly depends on the thickness [...] to the atmosphere (albedo), that is absorbed by snow and sea ice, ant that is transmitted into the ocean (transmittance). We perform various radiation measurements during our field campaigns using Polarstern

in the Arctic and Antarctic, monitoring ocean currents at our deep-sea moorings in the Fram Strait and the Weddell Sea, and the data from our sea-ice buoys drifting through the Antarctic and Arctic Oceans [...] planet’s hotspots As polar researchers, we have the privilege of working in unique habitats. The Arctic can be breathtaking: where else can you see the rugged glacial fjords of Greenland and Spitsbergen [...] striding across ice floes, or the stark contrasts produced by warm waters from the subtropics and Arctic cold fronts? Antarctic expeditions on board the research icebreaker Polarstern take us to the stormy

on, aggregation, ecological function and distribution of organic compounds in the changing polar ocean. We aim to understand the function of marine organic compounds, both, as diagnostic markers to decode [...] 2026 In the “FjordChange” project, we are investigating the influence of Atlanticification on the Arctic ecosystem around Spitsbergen. To this end, we are studying four fjords with varying degrees of A [...] of marine life Subtopic 6.3 The future biological carbon pump Subtopic 6.4 Use and misuse of the ocean: Consequences for marine ecosystems Publications of the Section Biological carbon pump Influence of

Earth System Models We simulate Arctic sea ice for the past, current and possible future climates, with regional sea ice-ocean and Earth System Models. Regional ocean-sea ice models have the advantage [...] al., 2014 ). We test those parameterizations in regional sea ice ocean models such as NAOSIM ( Köberle and Gerdes, 2003 ) and an Arctic model set-up of the MITgcm ( Castro-Morales et al., 2014 ). After [...] usually much coarser spatially resolved but have the advantage of simulating the atmosphere model, the ocean and the sea-ice simultaneously. Earth System Models (ESMs) additionally include vegetation and chemistry

project is to build an efficient integrated Arctic Observation System (iAOS) by extending, improving and unifying existing systems in the different regions of the Arctic. Contact: T. Soltwedel, C. Hasemann, I [...] European open ocean fixed point observatories and to improve access to these key installations for the broader community. These will provide multidisciplinary observations in all parts of the oceans from the [...] Purser SenseOcean (Marine sensors for the 21st Century) EU funded FP7 project Duration: 01.10.2013 - 30.09.2017 Coordinator: Denise Martin, Natural Environment Research Council, UK SenseOCEAN brings together

production of data set time series of variables that describe the state of the atmosphere, land, ocean and the cryosphere. Sea ice is listed as one of the 13 Essential Climate Variables and the aim of [...] group is to produce datasets of sea ice concentration sea ice thickness sea ice drift that include Arctic and Antarctic sea ice and the respective uncertainties. The data sets both parameters will consist [...] thickness time series from data of the ERS-1, ERS-2, EnviSat and CryoSat-2 radar altimeter missions of Arctic and Antarctic sea ice. The production of a time-series of Antarctic sea-ice thickness is based on