颱風侵台期間路徑發生打轉之研究

陳雨青

doi:10.6342/NTU.2010.01986

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颱風侵台期間路徑發生打轉之研究

A Study on the Occurrence of Looping Track for Typhoons Affecting Taiwan

陳雨青 , Masters　　Advisor：李清勝　　

繁體中文 DOI： 10.6342/NTU.2010.01986

颱風；打轉；焚風； WRF ；渦度收支； Typhoons ； Looping tracks ； Foehn ； WRF ； Vorticity budget

Abstract │ Reference (45) │ Altmetrics

Abstract 〈TOP〉

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Purpose of this study is to examine the occurrence of looping track for typhoons affecting Taiwan such as Supertyphoon Sinlaku（2008）. All typhoons which invaded northern Taiwan in 1990∼2009 and experienced looping tracks are examined. In addition, all typhoons with similar tracks but did not have looping tacks are also examined. Results show that a typhoon which moves northwestward to affect northern Taiwan tends to have higher possibility to take a looping track if its intensity is stronger and the moving speed is slower. The position of the looping path also is related to TYs’ landfall position. On the other hand, significant foehn phenomenon often occurs near southeastern Taiwan before the looping track of typhoon.
    High resolution（4 km）simulation is conducted using WRF（Weather Research and Forecasting Model）V3.1.1 to investigate the possible mechanisms leading to the looping motion of Supertyphoon Sinlaku which affected Taiwan in 2008. In the control experiment, the typhoon intensity, structure and track especially the landfall point and the looping track are well-simulated. When Sinlaku just making landfall, its stronger wind field shift from northeast to northwest. Such change in wind field structure tended to drift typhoon toward the southwest. A detail vorticity budget analysis（η = 0.88∼0.993）reveals that the divergence term and residual term were enhanced significantly. They are the major contribution to the local change of relative vorticity and cause typhoon to change its moving direction from northwestward to southwestward. At low level（η = 0.993）, a large area of warm and dry air which is caused by the adiabatic warming of the downslope flow associated with Sinlaku after crossing over the mountains is observed at the southeast of Taiwan.

Reference ( 45 ) 〈TOP〉

李清勝與張龍耀，2003：妮蔻兒颱風（Nichole,1998）侵台前路徑變化之研究。大氣科學，31，285-306。
連結：
洪秀雄與胡仲英，1989：颱風引發焚風之初步研究。大氣科學，17，1-44。
連結：
黃清勇與許依萍，1998：台灣地形對理想型颱風環流之影響。大氣科學，26， 281-324。
連結：
簡國基與李清勝，2002：楊希颱風（楊希，1990）侵台的數值模擬與分析。大氣科學，30，147-170。
連結：
Adem, J., 1956：A series solution for the barotropic vorticity equation and its application in the study of atmospheric vortices. Tellus, 8, 364-372.
連結：

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