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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2020-165
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-165
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 18 May 2020

Submitted as: research article | 18 May 2020

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This preprint is currently under review for the journal BG.

Quasi-tropical cyclone caused anomalous autumn coccolithophore bloom in the Black Sea

Sergey V. Stanichny, Elena A. Kubryakova, and Arseny A. Kubryakov Sergey V. Stanichny et al.
  • Marine Hydrophysical Institute, Russian Academy of Sciences, Sevastopol, Russian Federation

Abstract. Short-period action of the quasi-tropical cyclone in September 2005 caused strong autumn coccolithophores bloom in the Black Sea lasted for more than 1.5 months. The cyclone induced intense upwelling of deep waters with temperature on 10–13 °C lower than surrounding waters and acceleration of the Rim Current up to extreme values of 0.75 m s−1. The Rim current transported nutrient-rich waters from the north-western shelf to the zone of the cyclone action. Mixing of the shelf and upwelled waters triggers the initial growth of remote sensing reflectance (Rrs) indicating the beginning of the coccolithophore bloom. After two weeks, the bloom shifted directly to the zone of maximum upwelling in the western cyclonic gyre, where Rrs reached values of 0.018 sr−1, corresponding to estimates of 107 cells l−1. Advection by the Rim Current spread the bloom over the entire south part of the Black Sea on more than 1000 km from its initial source.

Sergey V. Stanichny et al.

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Sergey V. Stanichny et al.

Sergey V. Stanichny et al.

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In this paper we show that the short-period impact of tropical cyclones can trigger intense long-term bloom of coccolithophores, which are the major marine calcifiers playing an important role in the balance and fluxes of inorganic carbon in the ocean. In our paper we describe the evolution and physical reasons of such unusual bloom observed in autumn 2005 in the Black Sea on the base of satellite data.
In this paper we show that the short-period impact of tropical cyclones can trigger intense...
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