On the Accuracy of a Parameterized Typhoon Model
Date Issued
2007
Date
2007
Author(s)
Chen, Yu-Chuen
DOI
zh-TW
Abstract
Inertial currents are frequently observed in the South China Sea (SCS), especially during or after the passages of typhoons. To realize the mechanism of the upper-ocean response to a moving typhoon, researchers usually set up a simulated wind field for the specific case. However, only a few studies were made to examine the accuracy of mostly used typhoon models.
In this paper, the typhoon wind speeds of Holland (1980) model by utilizing the characteristic parameters from Japan Meteorological Agency are compared to those of SSM/I observations. It is found that some typhoons with such features as a near circular shape and a sound structure have better simulated results. This is due to the original assumption of a symmetric pressure distribution of the model. Thus it is also proved that Holland model can reasonably describe the major wind field of a typhoon.
Moreover, the model is applied to the typhoon cases associated with certain inertial motions observed by 4 current stations in SCS. It is shown that if the residence time of a typhoon matches the local inertial period, the resonance may occur and the winds will induce more persistent inertial motions in the ocean.
Subjects
慣性流
颱風
模擬風場
特徵參數
滯留時間
共振
inertial current
typhoon
simulated wind field
characteristic parameter
residence time
resonance.
Type
thesis
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