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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/71144

    Title: 利用MPAS模式探討大尺度環流變異度對莫拉克颱風(2009)路徑之影響;The Influence of Large-scale Flow Variability on Translation of Typhoon Morakot (2009) Using MPAS Simulations
    Authors: 張幼
    Contributors: 大氣科學學系
    Keywords: 大尺度環流;颱風;MJO;MPAS
    Date: 2016-07-22
    Issue Date: 2016-10-13 12:08:46 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 前人研究結果表明,西南季風與Madden-Julian oscillations (MJO)共同作用的大尺度條件下,莫拉克(Morakot)颱風(2009)在台灣登陸後停滯超過十五小時,給台灣南部帶來嚴重的災害。本文利用可變解析度(60-15 km)全球模式Model for Prediction Across Scales (MPAS) 探討不同時間尺度的季風環流對莫拉克颱風移動路徑的影響。模式的初始場取自ERA-interim的再分析資料,分離出三個不同時間尺度的分量,分別為綜觀尺度(SYN)、準雙週(QBW)以及MJO分量。
    ;This study uses the global MPAS Model at variable 60-15 km resolution to investigate the interaction between the Typhoon Morakot (2009) and the large-scale environmental flows. Three components of different time scales are filtered from ERA-interim for the model initial fields, namely the synoptic-scale (SYN) mode, quasi-biweekly (QBW) mode and the Madden-Julian oscillations (MJO) mode. To investigate the individual effect of multi-time-scale flows on the evolution of Typhoon Morakot, sensitivity experiments are conducted. Compared to the WRF simulations with different resolutions, the simulation of the TC movement is better for the control experiment, especially the northward turn after making landfall. In the absence of larger-scale monsoonal flow (no_QBW and no_MJO), the simulated Morakot in general takes a quite westward track across Taiwan, without the observed northward movement after landfall. On the other hand, there exists southwesterly wind anomaly from South China Sea to the vicinity east of Taiwan in the Western North Pacific when the intensity of MJO component in the initial field is enhanced by 50%, thus resulting in a north turn of Morakot at a much earlier time than the observed. The simulated Morakot track under the intact MJO component lies in between MJO+50% and MJO-50% experiments, which suggests that the coalescence of Morakot with the monsoonal flow may be intimately related to its north turn after landfall.
    The MJO on the track of Typhoon Megi also shows similar impacts as in Morakot. In the absence of MJO, the simulated Megi in general takes a westward movement after passing over the Philippines without turning north.
    Appears in Collections:[大氣物理研究所 ] 博碩士論文

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