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題 名 | 應用SSM/I微波資料分析桃芝颱風之降雨及海氣參數的變化=Applying SSM/I Satellite Data in Analyzing the Variations of the Rainfall and Air-sea Parameters of Typhoon Toraji |
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作 者 | 項義華; 劉振榮; | 書刊名 | 氣象預報與分析 |
卷 期 | 175 2003.06[民92.06] |
頁 次 | 頁13-19 |
分類號 | 328.886 |
關鍵詞 | 颱風; 衛星遙測; SSM/I; |
語 文 | 中文(Chinese) |
中文摘要 | 由於颱風是誕生於熱帶海洋上的劇烈天氣,所以必須仰賴衛星來監測海洋上的熱帶氣旋。因此本研究利用SSM/I微波資料來分析颱風的降雨強度及其生成發展的海氣參數變化。 研究結果顯示:(1)颱風降雨所釋出潛熱釋放量(LHR)的改變會影響隨後的中心最大風速發生變化。(2)以桃芝颱風(6個時間點)降雨的四個象限分析統計結果得知,有5個是屬於轉向正確的,而1個為不明確,即有8成以上的正確率可得知颱風下一個時間要向右(左)偏轉,其左(右)半圓的降雨量會多於右(左)半圓。(3)由GMS-5 IR1頻道所得到的中心附近平均最低亮度溫度(Tbmin)值與SSM/I所反演的各個海氣參數(如潛熱通量、可感熱通量…等)的時序變化之間有不錯的相關性,且兩者約略可看出颱風強度增強與減弱的變化。 |
英文摘要 | Due to the fact that typhoons are severe weather systems that form over tropical oceans, satellites are heavily relied on in monitoring these cyclones on a regular basis. Thus, this study employs microwave data from the SSM/I instrument in studying the precipitation intensity and cyclogenesis of Typhoon Toraji. Analytical studies indicate three important results: (1)The latent heat release (LHR) from the typhoon's rainfall can strongly influence the internal maximum wind speeds. (2)According to the statistical analysis of Typhoon Toraji's rainfall distribution (~111 km) in six separate time periods, which was subsequently divided into four quadrants, a total of five accurate course changes was recorded with only one inconsistency. This indicates that the accuracy in determining whether the typhoon would turn right (left) in the next time period, where the amount of rainfall of the left (right) semicircle would exceed the right (left) semicircle was above 80%. (3)From the average brightness temperature values obtained from the GMS-5 IR1 channel near the vicinity of the typhoon's center, a nice correlation existed with the various sea-air parameters (latent heat flux, sensible heat flux...etc) derived from the SSM/I data. Through the two sets of data, the changes in the intensification and weakening of the typhoon. Could roughly be observed. |
本系統中英文摘要資訊取自各篇刊載內容。