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Findlay, Helen S.; Gibson, Georgina; Kedra, Monika; Morata, Nathalie; Orchowska, Monika; Pavlov, Alexey K.; Reigstad, Marit; Silyakova, Anna; Tremblay, Jean-eric; Walczowski, Waldemar; Weydmann, Agata; Logvinova, Christie. |
The Arctic Ocean is one of the fastest changing oceans, plays an important role in global carbon cycling and yet is a particularly challenging ocean to study. Hence, observations tend to be relatively sparse in both space and time. How the Arctic functions, geophysically, but also ecologically, can have significant consequences for the internal cycling of carbon, and subsequently influence carbon export, atmospheric CO2 uptake and food chain productivity. Here we assess the major carbon pools and associated processes, specifically summarizing the current knowledge of each of these processes in terms of data availability and ranges of rates and values for four geophysical Arctic Ocean domains originally described by Carmack & Wassmann (2006): inflow... |
Tipo: Text |
Palavras-chave: Sea ice; Climate change; Ecosystem function; Carbon cycling. |
Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00617/72889/71907.pdf |
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Oleszczuk, Barbara; Michaud, Emma; Morata, Nathalie; Renaud, Paul E.; Kędra, Monika. |
The aim of this study was to assess bioturbation rates in relation to macrozoobenthos and environmental variables in the Svalbard fjords, Barents Sea and Nansen Basin during spring to summer transition. The results showed differences in benthic community structure across sampled area in relation to sediment type and phytopigment content. Fjords, Barents Sea and the shallow parts of Nansen Basin (<400 m) were characterized by high functional groups diversity, and by biodiffusive and non-local rates ranging from 0.05 to 1.75 cm−2 y−1 and from 0.2 to 3.2 y−1, respectively. The deeper parts of Nansen Basin, dominated by conveyors species, showed only non-local transport rates (0.1–1 y−1). Both coefficients intensity varied with benthic biomass. Non-local... |
Tipo: Text |
Palavras-chave: Non-local transport; Biodiffusive transport; Macrozoobenthos; Spring season; Sea ice cover; Arctic Ocean. |
Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00502/61329/64901.pdf |
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Berge, Jorgen; Daase, Malin; Renaud, Paul E.; Ambrose, William G., Jr.; Darnis, Gerald; Last, Kim S.; Leu, Eva; Cohen, Jonathan H.; Johnsen, Geir; Moline, Mark A.; Cottier, Finlo; Varpe, Oystein; Shunatova, Natalia; Balazy, Piotr; Morata, Nathalie; Massabuau, Jean-charles; Falk-petersen, Stig; Kosobokova, Ksenia; Hoppe, Clara J. M.; Weslawski, Jan Marcin; Kuklinski, Piotr; Legezynska, Joanna; Nikishina, Daria; Cusa, Marine; Kedra, Monika; Wlodarska-kowalczuk, Maria; Vogedes, Daniel; Camus, Lionel; Tran, Damien; Michaud, Emma; Gabrielsen, Tove M.; Granovitch, Andrei; Gonchar, Anya; Krapp, Rupert; Callesen, Trine A.. |
The current understanding of Arctic ecosystems is deeply rooted in the classical view of a bottom-up controlled system with strong physical forcing and seasonality in primary-production regimes. Consequently, the Arctic polar night is commonly disregarded as a time of year when biological activities are reduced to a minimum due to a reduced food supply. Here, based upon a multidisciplinary ecosystem-scale study from the polar night at 79 degrees N, we present an entirely different view. Instead of an ecosystem that has entered a resting state, we document a system with high activity levels and biological interactions across most trophic levels. In some habitats, biological diversity and presence of juvenile stages were elevated in winter months compared to... |
Tipo: Text |
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Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00288/39885/38620.pdf |
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