使用EGBVTD分析颱風環流非對稱結構

本研究將陸基速度軌跡顯示(Ground Based Velocity Track Display GBVTD)方法推廣至兩座都卜勒雷達，使得吾入可以將颱風環流本身與環境平均風場分離，進而計算出颱風徑向風場的非對稱結構，並提升反演所得的颱風切向風分量的準確性。與傳統的雙雷達合成方法相比，本方法可以在有資料缺失的情況下，較易於反演出較大區域內完整的颱風結構。本研究中將此方法(Extended-GBVTD; EGBVTD)用在分析兩個真實個案，即在洋面上的丹尼颶風(1997)，與登陸後的納莉颱風(2001)，以驗證其實際應用的可行性與優缺點。

關鍵字

GBVTD ；颱風；都卜勒雷達

並列摘要

In this study, the Ground Based Velocity Track Display (GBVTD) method is extended to two Doppler radars. With this extension, it becomes possible to separate the typhoon intrinsic circulation from the environmental mean wind, and compute the asymmetric typhoon radial wind components. The latter can be used to further improve the accuracy of the retrieved typhoon tangential winds. Compared with the traditional dual-Doppler synthesis method, it is easier to use this extended method to infer the complete typhoon structure over a larger area when there are missing data. The performance and accuracy of this so-called Extended GBVTD (EGBVTD) method are verified by applying it to two case studies-the Hurricane Danny (1997) over the ocean, and the Typhoon Nan (1997) after landfall.

並列關鍵字

GBVTD ； Typhoon ； Doppler radar

國際替代計量

使用EGBVTD分析颱風環流非對稱結構

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