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Pelagic Ecosystem of the Nansen Basin under the Influence of Variable Atlantic Water Inflow: The Mechanism Forming Diatom Bloom in the Marginal Ice Zone

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Abstract

Unique data were obtained on the abnormally high level of phytoplankton biomass (30 g m–3) in the marginal ice zone of the deep-water High Arctic (the Nansen Basin, 83° N) during observations onboard a ship in the summer of 2020. The changes in species composition and the increase in abundance of plankton phytocenoses were determined by the complex hydrographic structure formed due to the interaction between the warm Atlantic and cold Arctic water masses and confirmed the important role of the North Atlantic Current in the European sector of the Arctic Basin. For the first time, a reliable relationship was established between the phytoplankton productivity and the halocline depth (an indicator of rising Atlantic water enriched with nutrients, primarily nitrogen). It was shown for the first time that the large cryopelagic centric diatom Porosira glacialis (= Podosira hormoides var. glacialis) can be a species forming phytoplankton bloom in the marginal ice zone of the High Arctic.

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ACKNOWLEDGMENTS

The authors are grateful to the crew of R/V Akademik Mstislav Keldysh, as well as thank N.V. Politova, A.N. Novigatskii, A.L. Chultsova, A.S. Shchuka, I.A. Zamyatin, and I.I. Rusanov for their assistance in water sampling and analysis.

Funding

The analysis of phytoplankton samples and hydrological–hydrochemical data was supported by the Russian Foundation for Basic Research (project no. 19-05-50090). The expedition research was funded by the State Budget (financing of marine expeditions) and by the Russian Science Foundation (project no. 20-17-00157). This work was carried out under the state task on subject no. 0128-2021-0009.

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Authors and Affiliations

  1. Shirshov Institute of Oceanology, Russian Academy of Sciences, 117218, Moscow, Russia

    L. A. Pautova, V. A. Silkin, M. D. Kravchishina, V. G. Yakubenko, E. A. Kudryavtseva, A. A. Klyuvitkin &  L. I. Lobkovsky

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  1. L. A. Pautova
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  2. V. A. Silkin
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  3. M. D. Kravchishina
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  4. V. G. Yakubenko
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  5. E. A. Kudryavtseva
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  6. A. A. Klyuvitkin
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  7. L. I. Lobkovsky
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Corresponding authors

Correspondence to V. A. Silkin or M. D. Kravchishina.

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Translated by M. Hannibal

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Pautova, L.A., Silkin, V.A., Kravchishina, M.D. et al. Pelagic Ecosystem of the Nansen Basin under the Influence of Variable Atlantic Water Inflow: The Mechanism Forming Diatom Bloom in the Marginal Ice Zone. Dokl. Earth Sc. 499, 590–594 (2021). https://doi.org/10.1134/S1028334X21070138

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  • DOI: https://doi.org/10.1134/S1028334X21070138

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