ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2021, Vol. 18, No. 4, pp. 228-235

Trends of long-term changes in chlorophyll concentration, primary production of phytoplankton and water temperature in the shelf regions of the Black Sea

V Kovalyova 1 , Z.Z. Finenko 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: 12.07.2021
DOI: 10.21046/2070-7401-2021-18-4-228-235
Studies of long-term seasonal changes in chlorophyll concentration, primary phytoplankton production and water temperature in the surface layer of the southern and eastern shelf zones of the Black Sea from 1998 to 2015 were conducted. SeaWiFS and MODIS satellite measurements were used to analyze trends in chlorophyll concentration and water temperature and to calculate phytoplankton primary production. Fisher’s test was used to analyze the statistical significance of the trends of long-term changes. We took the significance level α = 0.1. On the shelf of the Anatolian coast and the eastern part of the Black Sea, there were no trends in chlorophyll concentration and phytoplankton productivity according to averaged long-term data. There is a general tendency towards a slight decrease in the chlorophyll concentration in the summer over an 18-year period; in other seasons, no directional changes were revealed. In some areas, there was a slight decrease in primary production in the summer and an increase in the winter. However, with a high seasonal variability of the studied indicators, no statistically significant changes could be identified. According to average annual data, tendencies to an increase in temperature were observed almost over the entire investigated coastal region of the Black Sea. The average annual increase in water temperature was connected mainly with the temperature increase in winter.
Keywords: southeastern Black Sea, long-term trends, water temperature, phytoplankton, chlorophyll a, primary production, satellite observations
Full text


  1. Belokopytov V. N., O klimaticheskoi izmenchivosti termokhaliinoi struktury Chornogo morya (On the climatic variability of the Black Sea thermohaline structure), In: Ekologicheskaya bezopasnost’ pribrezhnoi i shelfovoi zon i kompleksnye issledovaniya resursov shelfa, Sevastopol: EKOSI-Gidrofizika, 2013, Vol. 27, pp. 226–230 (in Russian).
  2. Ivanov V. A., Belokopytov V. N., Oceanography of the Black Sea, Sevastopol: EKOSI-Gidrofizika, 2011, 209 p. (in Russian).
  3. Kovalyova I. V., Modelirovanie sezonnoi i mnogoletnei izmenchivosti pervichnoi produktsii fitoplanktona v Chernom more: Diss. kand. boil. nauk (Modeling seasonal and long-term variability of the primary production of phytoplankton in the Black Sea, Cand. boil. sci. thesis), Sevastopol, 2017, 147 p. (in Russian).
  4. Polonskii A. B., Shokurova I. G., Belokopytov V. N., Ten-year variability of temperature and salinity in the Black Sea, Morskoi gdrofizichskii zhurnal, 2013, Vol. 6, pp. 27–41 (in Russian).
  5. Suslin V. V., Churilova T. Ya., Lee M., Moncheva S., Finenko Z. Z., Comparison of the Black Sea chlorophyll a algorithms for SeaWiFS and MODIS instruments. Fundamentalnaya i prikladnaya gidrofizika, 2018, Vol. 11, No. 3, pp. 64–72 (in Russian), DOI: 10.7868/S2073667318030085.
  6. Finenko Z. Z., Kovalyova I. V., Suslin V. V., Use of Satellite Data for the Estimation of the Specific Growth Rate of Phytoplankton in the Surface Layer of the Black Sea, Russian J. Marine Biology, 2019, Vol. 45, No. 4, pp. 313–319, DOI: 10.1134/S1063074019040059.
  7. Ginzburg A. I., Kostianoy A. G., Sheremet N. A., Seasonal and interannual variability of the Black Sea surface temperature as revealed from satellite data (1982–2000), J. Marine Systems, 2004, Vol. 52, pp. 33–50, DOI: 10.1016/j.jmarsys.2004.05.002.
  8. Kazmin A. S., Zatsepin A. G., Long-term variability of surface temperature in the Black Sea, and its connection with the large-scale atmospheric forcing, J. Marine Systems, 2007, Vol. 68, No. 1, pp. 293–301, DOI: 10.1016/j.jmarsys.2007.01.002.
  9. Kopelevich O. V., Sheberstov S. V., Yunev O., Basturk O., Finenko Z. Z., Nikonov S., Vedernikov V. I., Surface chlorophyll in the Black Sea over 1978–1986 derived from satellite and in situ data, J. Marine Systems, 2002, Vol. 36, pp. 145‒160.
  10. Kubryakov A. A., Zatsepin A. G., Stanichny S. V., Anomalous summer-autumn phytoplankton bloom in the Black Sea driven by several strong wind events, J. Marine Systems, 2019, Vol. 194, pp. 11–24, DOI:
  11. Oguz T., Dippner J. W., Kaymaz Z., Climatic regulation of the Black Sea hydro-meteorological and ecological properties at interannual-to-decadal time scales, J. Marine Systems, 2006. Vol. 60, pp. 235–254, DOI: 10.1016/j.jmarsys.2005.11.011.
  12. Stelmakh L. V., Spatial and Temporal Variability of Carbon to Chlorophyll a Ratio in Phytoplankton of the Surface Layer in Shallow Water Areas of the Black Sea (Crimea), Intern. J. Algae, 2015, Vol. 17, Issue 4, pp. 385–396, DOI: 10.1615/InterJAlgae.v17.i4.60.
  13. Suslin V. V., Churilova T. Ya., Regional algorithm for separating light absorption by chlorophyll-a and colored detrital matter in the Black Sea, using 480–560 nm bands from ocean color scanners, Intern. J. Remote Sensing, 2016, Vol. 37, No. 18, pp. 4380–4400, DOI: