TIDAL UPWELLING ON THE SOUTHWESTERN SHELF OF SAKHALIN ISLAND

  • G. V. Shevchenko Sakhalin Branch of the All-Russian 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 All-Russian Research Institute of Fisheries and Oceanography
DOI 10.29006/1564-2291.JOR-2022.50(1).2
Keywords tidal upwelling, tidal currents, continental slope, shelf water temperature, chlorophyll-a, ammonium nitrogen, southwestern Sakhalin

Abstract

The materials of instrumental measurements of the current velocity and water temperature at the horizons of 100 and 10 m near the continental slope of southwestern Sakhalin Island (south of Moneron Island) are considered. At a depth of 100 m, diurnal fluctuations in water temperature with an amplitude of 0.5–1°C were revealed, depending on the intensity of tidal currents (temperature decrease when the flow is oriented southeast, towards the La Perouse Strait), interpreted as tidal upwelling. The materials of hydrological surveys on the T1 oceanological section have been analyzed, vertical distributions of water temperature, chlorophyll-a and biogenic elements have been constructed based on the measurements on April 15, 1999. They are consistent with the concept of tidal mixing.

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Published
2022-04-28
Issue
Vol 50 No 1 (2022): Journal of Oceanological Research
Section
Ocean physics and climate

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