A STUDY OF FLOW FIELD INFLUENCED BY INTERNAL TIDES AND THE KUROSHIO AROUND THE IZU-CHAIN ISLANDS

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  • BIOGEOCHEMICAL RESPONSES TO SEASONAL OCEANIC VARIABILITY AROUND THE KUROSHIO ANALYZED USING A ROMS-NPZD MODEL

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Abstract

 Regional Oceanic Numerical simulations using ROMS with tidal forcing were conducted to investigate tidally induced internal waves (internal tides) in the vicinity of the Izu-chain Islands. The tides enhance the enrgy flux of internal waves by about 10 times as large around the islands. Therefore, in the study region, the internal waves are considerably enargized by the tidal forcing. Although the total and baroclinic components of kinetic eneygy increase due to the tides, the barotropic kinetic energy component decreased by the tidal forcing. The internal waves accompanied by strong baroclinic flows largely contribute to the flow compared to the currents due to winds and the Kuroshio. The numerical simulateons also revealed the enhanced eddy motiions due to the tidal forcing, suggesting that the tides contiribute to lateral mixing or transports via meso- and submesoscale eddies.

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