Sub-Monthly Circulation Features Associated with Tropical Cyclone Tracks over the East Asian Monsoon Area during July-August Season
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概要
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This study explores sub-monthly variation for the circulation and convection in the western North Pacific during July and August. The sub-monthly variability is dominated by a wave-like pattern that propagates north-northwestward from the northeast of Papua New Guinea, to the East China Sea. The wavelength and phase speed are about 4000km and 5m s^<-1>, respectively. This feature fluctuates in a 7-30 day timescale, with the spectral peak at 12.5 days. The vertical structure exhibits a barotropic structure below 500hPa, which gradually tilts northwestward in upper levels near Taiwan and southern Japan. For more than 70% of cases which reveal the wave-like fluctuation, recurving tropical cyclones are found to occur concurrently with the wave-like pattern. These recurving tropical cyclones are likely part of the wave-like pattern, and may not be regarded as isolated vortices. The wave-like pattern occurs in a large-scale flow, which is characterized by an enhanced monsoon trough extending eastward into the Philippine Sea, and a strong ridge protruding westward from the subtropical high. It is suggested that the cyclonic phase of the wave-like pattern provides a favorable environment for the genesis, growth, and movement of the recurving tropical cyclones. The monsoon trough/subtropical ridge fluctuation, the wave-like pattern, and tropical cyclones, which represent phenomena in three different time and spatial scales, form a multi-scale system that affects the sub-monthly variability of the circulation, and convection, in the western North Pacific during the boreal summer.
- 社団法人日本気象学会の論文
- 2006-10-25
著者
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HSU Huang-Hsiung
Department of Atmospheric Sciences, National Taiwan University
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Hsu Huang-hsiung
Dep. Of Atmospheric Sciences National Taiwan Univ.
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Hsu Huang-hsiung
Department Of Atmospheric Sciences National Taiwan University
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KO Ken-Chung
Department of Geography, National Kaohsiung Normal University
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Ko Ken-chung
Department Of Geography National Kaohsiung Normal University
関連論文
- Eddy Energy along the Tropical Storm Track in Association with ENSO
- Sub-Monthly Circulation Features Associated with Tropical Cyclone Tracks over the East Asian Monsoon Area during July-August Season
- Simulation of the 1998 East Asian Summer Monsoon using the Purdue Regional Model(Regional Climate Modeling for Monsoon System)
- Northward and Northwestward Propagation of 30-60 Day Oscillation in the Tropical and Extratropical Western North Pacific
- Stratospheric Antarctic Intraseasonal Oscillation during the Austral Winter