HYDROLOGICAL AND HYDROCHEMICAL WATER STRUCTURE IN THE UPWELLING ZONE OFF THE SOUTHWESTERN COAST OF SAKHALIN ISLAND

  • G. V. Shevchenko Sakhalin Branch of the Russian Federal Research Institute of Fisheries and Oceanography; Institute of Marine Geology and Geophysics, Far Eastern Branch of the Russian Academy of Sciences
  • V. E. Maryzhikhin Sakhalin Branch of the Russian Federal Research Institute of Fisheries and Oceanography
  • V. N. Chastikov Sakhalin Branch of the Russian Federal Research Institute of Fisheries and Oceanography
DOI 10.29006/1564-2291.JOR-2023.51(1).3
Keywords upwelling, wind, monsoon, water temperature, surge, shelf, nitrate nitrogen, silicon, phosphorus, southwestern Sakhalin

Abstract

Based on the spatial distributions of sea surface temperature according to satellite observations and observational data on standard oceanographic sections of the southwestern shelf of the Sakhalin Island in summer (August) and autumn (November) shows the existence of seasonal upwelling, which is formed under the influence of northerly and northwesterly winds, typical of the winter monsoon. In this area, it manifests to a lesser extent than in the northern part of the Tatar Strait (Shevchenko et al., 2011) due to the features of the bottom topography (short deep shelf) and the large thickness of the upper heated layer, but quite clearly. At the same time, deep water rises, rich in biogenic elements and mineral phosphorus, which is important for the development of young growth of kelp. In the warm period of the year, under the conditions of the prevailing southerly wind, upwelling is observed in this area sporadically (4 ̶ 5 times per season) in the form of sharp, up to 12 ̶ 15 °C, water temperature drops in the coastal area lasting from 3 to 12 days. Most often they occur during the passage of cyclones over the southern part of Sakhalin or Hokkaido Island, when they enter the southern part of the Sea of Okhotsk or the South Kuril Islands and formed east and northeast blowing winds over the study area.

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Published
2023-04-10
Issue
Vol 51 No 1 (2023): Journal of Oceanological Research
Section
Ocean physics and climate

Transfer of copyrights occurs on the basis of a license agreement between the Author and Shirshov Institute of Oceanology, RAS