Excitation of the 5-day Wave.

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概要

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• The 5-day wave was detected in composite maps of geopotential height fields of ECMWF data set of 8 years from 1984 to 1991. The structure was similar to that predicted by the Laplace's tidal equation except a characteristic NW-SE meridional phase tilt in the Southern Hemisphere. To understand the cause of this meridional phase tilt, numerical simulations were carried out with the shallow water equation on a sphere (Laplace's tidal equation) with a periodic forcin g in aform of a standing wave of zonal wavenumber 1. The result showed that the meridional phase tilt of the 5-day wave was produced only when the forcing was located in high latitudes. Comparison of this result with the observational results indicates that a forcing of the 5-day wave is located in the high latitude of the Southern Hemisphere. The standing wave is produced by coupling of the Antarctica with the fluctuating Westerly. Numerical simulations which incorporated this mechanism reproduced the realistic meridional phase tilt of the observed 5-day wave, suggesting that this coupling is an effective mechanism which excites the 5-day wave by resonance.

• 日本学士院の論文

著者

• Kimura Ryuji

  Ocean Research Institute The University Of Tokyo

• CHEONG Hyeong-Bin

  Korian Inter-University Institute of Ocean Science, Pusan Fisheries University

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• Excitation of the 5-day Wave.

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