Modelling the primary production in the South-Eastern Baltic sea
https://doi.org/10.46845/1997-3071-2022-64-11-22
Abstract
Field measurements conducted in the coastal zone of the Russian sector of the Baltic Sea south-eastern part from April 2008 to April 2009 allowed to describe patterns of seasonal distribution of the chlorophyll a concentration (Chl) and primary production (PP) of phytoplankton in the water column under environmental conditions. It is shown that the vertical distribution of Chl is determined by its concentration in the surface layer and hydrophysical conditions, while the vertical distribution of PP performs a decreasing function of depth and light. In late spring-early summer, when the growth of phytoplankton is limited by nutrients, the subsurface maximum of Chl can be observed; as a result, contribution of this layer to the integral PP increases. Indicators of phytoplankton productivity in the coastal zone have been calculated depending on the trophic state of waters (oligotrophic, mesotrophic, eutrophic). Significant variations of Chl (1.2-19.8 mg·m-3) and PP (40-2153 mgC·m-2·day-1) values are observed from the oligotrophic level in the winter period (December-March) to eutrophic level in spring (April) and summer during maximum phytoplankton growth. The analysis has been conducted of the well-known algorithms for calculating PP, proposed for the Baltic Sea, including the equations for detecting the dependence of photosynthesis on the light, presented by J. Still, T. Platt, and A. Jassby-T. Platt. Тhe equations of T. Platt and A. Yassby-T. Platt provided a better correspondence of the PP values calculated for different depths to the data of field measurements of PP at these depths, and J. Still's equation better reproduced the average value of water column PP.
About the Authors
E. A. Kudryavtseva
Shirshov P. P. Institute of Oceanology RAS
Russian Federation
Russian Federation
Kudryavtseva Elena Andreevna, PhD in Geographic Sciences, Scientific researcher
T. V. Bukanova
Shirshov P. P. Institute of Oceanology RAS
Russian Federation
Russian Federation
Bukanova Tatiana Vasilyevna, PhD in Geographic Sciences, Scientific researcher
S. V. Aleksandrov
Atlantic branch of Russian Federal Research Institute of Fisheries and Oceanography; Shirshov P. P. Institute of Oceanology RAS
Russian Federation
Russian Federation
Aleksandrov Sergey Valerievich, Head of Laboratory; PhD in Biological Sciences, Senior Researcher
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Review
For citations:
Kudryavtseva E.A., Bukanova T.V., Aleksandrov S.V. Modelling the primary production in the South-Eastern Baltic sea. KSTU News. 2022;(64):11-22. (In Russ.) https://doi.org/10.46845/1997-3071-2022-64-11-22
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