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An analysis of wind field characteristics in the northern and southern metropolitan areas of Taiwan during the typhoon period
Typhoon,wind field,wind statistical climatology,regression,wind speed estimation,
|Publication Year :||2019|
The observed wind fields (10-minute average) during the typhoon-warning period in 1961-2018 issued by the Central Weather Bureau are analyzed to study the influences of typhoon circulation on the wind fields of two major metropolitan areas in Taiwan. Considerable efforts were made to establish a wind statistical climatology dataset, corresponding to the observed typhoon positions (and typhoon intensity and size), for these two metropolitan areas. Results show that the wind field is strongly affected by typhoon position and Taiwan's topography during the typhoon period. The characteristics of wind climatology are significantly different for different areas. For example, easterly winds occur more often in the north metropolitan area, and northerly or southerly winds, in the south metropolitan area.
A statistical-climatology model for the wind field at the meteorological stations in these two metropolitan areas is established using the regression analysis method. The parameters considered in the model include the position, intensity, and size of typhoons. Results show that this model performs better than the climatology model in estimating the wind fields during the period when Typhoon Megi (2016) was affecting Taiwan. Further analyses are done to understand the applicability of the statistical-climatology model in estimating the wind field at the north and south metropolitan areas for the westward-moving typhoons that affected Taiwan. Results show that the differences in the structures of typhoons that travel in different directions or are involved in different environments, the strong wind associated with the mesoscale convective systems of typhoon, and the weakening of the wind field after the looping track of a typhoon may lead the model to overestimate or underestimate the station wind field. Therefore, precaution must be made regarding the possible effects mentioned above when applying this model to estimate the wind field during the typhoon periods.
|Appears in Collections:||大氣科學系|
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