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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/71142

    Title: 利用觀測資料與多都卜勒風場反演系統做垂直速度上的驗證;Evaluation of vertical velocity retrieved by Wind Synthesis System Using Doppler Measurement
    Authors: 蘇俊瑋;Su,Chun-Wei
    Contributors: 大氣科學學系
    Keywords: 垂直速度;Verticlal velocity
    Date: 2016-07-21
    Issue Date: 2016-10-13 12:08:41 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 垂直速度會影響對流系統的生成與消散,對於天氣系統也會有一定的影響,例如:垂直速度大的話,會有利於對流的發展;但由於觀測儀器主要為水平上的觀測,較無法直接得知垂直上的風場結構,因此垂直上的風場結構訊息對我們來講是很需要但卻很難得到的資訊。
    為了從徑向風找回三維的風場結構Liou 和 Chang(2009)、Liou et al. (2012)、Liou et al.(2014)利用三維變分方法發展了多都卜勒風場反演系統( Wind Synthesis Using Doppler Measurement ,簡稱WISSDOM),它可以在複雜地形上做反演,也解決了傳統雷達所遇到的基線問題,同時也把渦度方程加入約束條件中,在近期的研究中WISSDOM對於天氣系統都能有好的反演結果,但在垂直速度反演部分還沒有真正的利用觀測資料來做驗證比較,無法去判斷反演出來的垂直速度的正確性。
    ;The vertical velocity has strong correlation with deep convections in weather system , but due to limitation of observation , the three-dimensional vertical wind distribution is difficult to know. The radial wind observation from Doppler radar can provide three-dimensional wind information , but compare to horizontal wind , the direct vertical wind component is of minor percentage in the radar wind observation is rather rare.
    To retrieve the three-dimensional wind structure from Doppler wind observation , a Wind Synthesis Using Doppler Measurement (WISSDOM) based on variational method is developed by Liou and Chang(2009)、Liou et al. (2012)、Liou et al.(2014). WISSDOM performed reasonably well on recent application , however , the vertical velocity retrieval has never been verified by real observation accurately.
    In order to statistically understand the retrieval performance , three cases including typhoon Fanapi (2010)、Mei-yu front experiment in Tonluo observed by NCU X-band mobile radar (TEAM–R) and typhoon Trimi(2013) observed by VHF , are employed to perform the verifications on vertical velocity. The result show WISSDOM retrieval has good agreement with radar vertical pointing wind observation in this three cases. In addition , it is found the radar data coverage plays an important role on the accuracy of vertical wind retrieval and the terminal velocity is also sensitive .
    Appears in Collections:[大氣物理研究所 ] 博碩士論文

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