Study of Abiotic Factors Controlling Marine Ecosystem Dynamics and Formation of Anomalous Conditions in the Coastal Waters of the Far East in 80th Cruise of the R/V  Professor Gagarinskiy

V. B. Lobanov; Лобанов В. Б.; M. G. Shvetsova; Швецова М. Г.; M. S. Fedorov; Федоров М.С.; E. Y. Tibenko; Тибенко Е. Ю.; S. G. Sagalaev; Сагалаев С. Г.; I. A. Prushkovskaya; Прушковская И. А.; M. S. Obrezkova; Обрезкова М. С.; A. A. Mazur; Мазур А. А.; S. P. Kukla; Кукла С. П.; I. F. Alekseev; Алексеев И. Ф.; P. P. Tishchenko; Тищенко П. П.; V. Tsoy; Цой В.; N. B. Lukyanova; Лукьянова Н. Б.; P. Y. Semkin; Семкин П. Ю.; A. F. Sergeev; Сергеев А. Ф.; A. Y. Yurtsev; Юрцев А. Ю.

doi:10.31857/S0030157423060084

Study of Abiotic Factors Controlling Marine Ecosystem Dynamics and Formation of Anomalous Conditions in the Coastal Waters of the Far East in 80th Cruise of the R/V Professor Gagarinskiy

Authors: Lobanov V.B.¹, Shvetsova M.G.¹, Fedorov M.S.¹, Tibenko E.Y.¹, Sagalaev S.G.¹, Prushkovskaya I.A.¹, Obrezkova M.S.¹, Mazur A.A.¹, Kukla S.P.¹, Alekseev I.F.¹, Tishchenko P.P.¹, Tsoy V.¹, Lukyanova N.B.¹, Semkin P.Y.¹, Sergeev A.F.¹, Yurtsev A.Y.²
Affiliations:
1. V.I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences
2. National Research Fleet Manager
Issue: Vol 63, No 6 (2023)
Pages: 1027-1030
Section: Информация
URL: https://journals.rcsi.science/0030-1574/article/view/162356
DOI: https://doi.org/10.31857/S0030157423060084
EDN: https://elibrary.ru/QWAGBL
ID: 162356

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Abstract

In the cruise No. 80 of the R/V Professor Gagarinskiy, from June 15 to July 18, 2022, complex hydrographic and hydrochemical studies were carried out in the Avachinskiy Bay of Kamchatka Peninsula, on the northeastern shelf of Sakhalin Island and in Peter the Great Bay to assess current environmental risks in the coastal zone of key areas of the Far Eastern seas of Russia and, in particular, to study possible abiotic factors that caused the mass mortality of marine organisms in Kamchatka in the fall of 2020. Comprehensive observations including CTD, hydrochemical water sampling, moorings deployment as well as sampling of plankton and bottom sediments were performed. An increased content of nutrients was found, both in subsurface and intermediate Pacific waters, in comparison with the data of the 1990–2000s. Intensive snowmelt on the adjacent mountain slopes during the survey period showed a significant effect of continental runoff on the hydrochemical characteristics of Avachinskiy Bay waters, causing a decrease in salinity and a significant increase in the concentration of nutrients and chlorophyll-a in the coastal zone. The dynamics of mesoscale eddies ensures the transport of coastal waters to the ocean over a distance of more than 100 miles. The obtained results suggest that the catastrophic phenomenon off Kamchatka, associated with anomalous harmful algae bloom, is due to the conjugation of biogeochemical and hydrographic factors – river runoff and the intrusion of deep waters on the shelf caused by coastal wind and dynamic upwelling during the period of maximum warming and eutrophication of the waters of the subarctic Pacific, as well as orographic and topographic features of Avachinskiy Bay.

Keywords

Kamchatka Peninsula, Avachinskiy Bay, the Okhotsk Sea, Sakhalin shelf, mesoscale eddies, hydrography, biogeochemistry

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