Abstract
The features of the long-term variability of the hydrochemical characteristics of deep-water basins of the Caspian Sea are studied on the basis of information obtained during 18- year annual monitoring and supplemented with historical data. The effect of hypoxia and the hydrogen sulfide layer on the position of the nitrate-maximum layer and the content of nitrates in it are shown. Studying the variability of the vertical distribution of the hydrochemical indicators revealed several factors that determine the removal of nutrients from the photic layer and their accumulation in the bottom layer. Among other things, the latest data revealed the unique features of the Caspian coastal upwelling. This will help to avoid underestimation of the productivity of the waters in the Middle Caspian Basin.
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References
A. Yu. Antonyuk, Candidate’s Dissertation in Geography (Moscow State University, Moscow, 2014).
S. V. Bruevich, Hydrochemistry of the Central and Southern Caspian Sea (Academy of Sciences of USSR, Moscow, 1937) [in Russian].
L. A. Dukhova, E. A. Serebrennikova, A. K. Ambrosimov, and A. A. Klyuvitkin, “Hydrochemical studies of deep-water basins of the Caspian Sea in August–September 2013 aboard the R/V Nikifor Shurekov,” Oceanology (Engl. Transl.) 55 (1), 145–147 (2015).
L. A. Zenkevich, Biology of the Soviet Seas (Academy of Sciences of USSR, Moscow, 1963) [in Russian].
V. D. Levshakova, A. G. Ardab’eva, and T. A. Tatarintseva, “Phytoplankton and primary production of plankton,” in The Caspian Sea: Fauna and Biological Productivity (Nauka, Moscow, 1985), pp. 5–54.
M. G. Karpinsky, Pseudosolenia calcar-avis (Bacillariophyta, Centrophyceae) in the Caspian Sea,” Russ. J. Biol. Invasions 1 (2), 81–86 (2010).
A. N. Kosarev, The Caspian Sea: Structure and Water Dynamics (Nauka, Moscow, 1990) [in Russian].
Handbook on Chemical Analysis of Marine and Fresh Waters at Environmental Monitoring of Fishery Reservoirs Prospective for Commercial Fishery in the World Ocean Regions (VNIRO, Moscow, 2003) [in Russian].
Environmental Problems of the Caspian Sea, Ed. by M. G. Khublaryan (Nauka, Moscow, 2000) [in Russian].
V. I. Romanenko, “Primary production of organic matter during photosynthesis in the Volga River cascade of reservoirs,” in Biological Productivity and Water Quality in the Volga River and Its Basin (Nauka, Moscow, 1984), pp. 48–60.
V. V. Sapozhnikov, “Processes of the accumulation of nutrients in the deep-water basins of the central and southern areas of the Caspian Sea,” Oceanology (Engl. Transl.) 42 (5), 646–650 (2002).
V. V. Sapozhnikov, O. K. Grashchenkova, K. K. Kivva, and A. V. Azarenko, “Hydrological and hydrochemical studies of the Middle and South Caspian Sea from the R/V Issledovatel’ Kaspia (September 2–17, 2006),” Oceanology (Engl. Transl.) 47 (2), 290–293 (2007).
V. V. Sapozhnikov and A. A. Belov, “Conditions for the appearance of hydrogen sulfide in deep-water basins of the Central and southern areas of the Caspian Sea,” Oceanology (Engl. Transl.) 43 (3), 344–346 (2003).
V. S. Tuzhilkin and A. N. Kosarev, “Long-term variations in the vertical thermohaline structure in deepwater zones of the Caspian Sea,” Water Resour. 31 (4), 376–383 (2004).
F. Peeters, R. Kipfer, D. Achermann, et al., “Analysis of deep-water exchange in the Caspian Sea based on environmental tracers,” Deep-Sea Res. 1 (47), 621–654 (2000).
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Serebrennikova, E.A., Sapozhnikov, V.V. & Dukhova, L.A. Special features of the hydrochemical conditions variability in the deep water basins of the Caspian Sea. Oceanology 55, 194–199 (2015). https://doi.org/10.1134/S0001437015020149
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DOI: https://doi.org/10.1134/S0001437015020149