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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, 2025, Vol. 22, No. 1, pp. 192-204

Assessment of long-term changes in phytoplankton productivity indicators in the shelf zone of the northern and northeastern Black Sea using satellite data

I.V. Kovalyova 1 , V.V. Suslin 2 
1 A.O. Kovalevsky Institute of Biology of the Southern Seas RAS, Sevastopol, Russia
2 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 28.11.2024
DOI: 10.21046/2070-7401-2025-22-1-192-204
The average annual and average seasonal dynamics of phytoplankton biomass and primary phytoplankton production in the surface layer as well as integrated primary production in the photosynthesis zone for 1998–2020 have been studied in the regions of the northeastern and northern Black Sea up to 500 m deep. Observations from SeaWiFS (Sea-Viewing Wide Field-of-View Sensor) and MODIS (Moderate Resolution Imaging Spectroradiometer) scanners and model calculations were used for the analysis. The models developed by us in previous studies were used. Over the 23-year period, in three regions along the Russian coast from Adler to the western point of Crimea negative statistically significant trends were revealed for biomass in the surface layer with a decrease by 20–24 %, integral primary production by 18–19 %, primary production in the surface layer by 17–25 %. The decrease in phytoplankton indicators was mainly due to the warm season. It is possible to indicate some gradual decrease in the overall level of all the parameters under consideration after 2012. The integral value of productivity differs from the values in the surface layer somewhat more than the surface phytoplankton indicators differ from each other, this may indicate the importance of hydrological and optical conditions in the water column. Since 2012, differences in the dynamics of phytoplankton indicators in the three regions have been observed mainly during the cold season. In the warm season since 2015, the differences in the dynamics of the three parameters in the studied waters have been poorly expressed. The average annual values are similar in nature.
Keywords: satellite observation data, model calculations, phytoplankton, biomass, primary products, long-term trends
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