「台風」の中心気圧と北上の程度の関係
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概要
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The purpose of this paper is to examine the relationship between the central pressure and northward movement of tropical cyclones that occurred from 1961 to 2000 in the mid-latitudes of the western North Pacific. In this Paper, the term tropical cyclone refers to a disturbance once exceeding maximum wind speed of 17.2m/s, including the period when the disturbance transformed into an extratropical cyclone. The data reported by the Japan Meteorological Agency in the ""Tropical Cyclone Tracks in the Western North Pacific 1951-1990"" and the ""Geophysical Review"" were analyzed. The study area extended from 25゜N to 45゜N and from 100゜E to 180゜. The central pressures when the tropical cyclone passed through five specific parallels (25゜N,30゜N,35゜N,40゜N and 45゜N) were calculated using the observation data. The frequency at which the tropical cyclone passed through these parallels was used as an index of northward movement. Then, the relationship between central pressure and northward movement was examined. As a result, a negative relationship between the central pressure and the northward movement was verified. However, some tropical cyclones disappeared at lower latitudes despite having very low central pressure at 25゜N. These tropical cyclones had large increases in central pressure before disappearing. On the other hand, the tropical cyclones that shifted toward higher latitudes correspond to their very low central pressure at the 25゜N had Small increases in central pressure at higher latitudes. This suggests the reintensification of tropical cyclones may affect the northward movement of disturbances.
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- 2005-03-20