Preprints
https://doi.org/10.5194/bg-2020-165
https://doi.org/10.5194/bg-2020-165

  18 May 2020

18 May 2020

Review status: a revised version of this preprint was accepted for the journal BG and is expected to appear here in due course.

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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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Sergey V. Stanichny et al.

Sergey V. Stanichny et al.

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Short summary
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.
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