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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2021, Vol. 18, No. 1, pp. 255-260

Satellite survey of winter bloom of coccolithophores in the eastern Black Sea in the cold season of 2020/2021

M.I. Mityagina 1 , O.Yu. Lavrova 1 
1 Space Research Institute RAS, Moscow, Russia
Accepted: 10.02.2021
DOI: 10.21046/2070-7401-2021-18-1-255-260
This paper describes a rare winter bloom of coccolithophores in the eastern Black Sea, identified via satellite data. From the end of November 2020 to February 2021, signatures of coccolithophores bloom have been detected in the optical satellite data taken over the eastern Black Sea. These observations and the abnormal winter bloom of coccolithophores we revealed in 2019 indicate the need to revise the common belief that regular mass coccolithophores bloom in the Black Sea occurs in spring and early summer seasons. The possibility to observe the bloom of coccolithophores using satellite data in the optical range is based on the fact that it is accompanied by an anomalously intensive scattering of light in the near-surface layer. This increase in light scattering is caused by the abundance of calcareous scales, into which the shells of these algae break down. Hence, it is possible to distinguish the bloom zones by the increase of water-leaving radiance. Based on satellite data, the approximate dates of the beginning of the bloom and its peak are determined. The bloom duration and its spatial characteristics are established. Coccolithophores are one of the primary limestone-producing organisms in the World Ocean. They affect the atmosphere’s level of carbon dioxide, and hence the temperature regime and climatic conditions. The revealing of an intensive winter bloom of coccolithophores is a step toward establishing the main patterns of coccolithophores life-cycle in its seasonal and climatic aspects.
Keywords: Black Sea, coccolithophores, coccolithophores bloom, vortex structures, satellite monitoring, Terra/Aqua MODIS, Landsat-8 OLI-TIRS, information system See the Sea
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