| 研究生: |
范耀仁 Yao-Ren Fan |
|---|---|
| 論文名稱: |
線狀組織性中尺度對流系統之渦度分析模擬 |
| 指導教授: |
禚漢如
Han-Ru Cho |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
地球科學學院 - 大氣物理研究所 Graduate Institute of Atmospheric Physics |
| 畢業學年度: | 92 |
| 語文別: | 中文 |
| 論文頁數: | 52 |
| 中文關鍵詞: | 中尺度對流系統 、中尺度渦旋 、傾斜項 |
| 相關次數: | 點閱:17 下載:0 |
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本研究利用第五代中尺度數值模式(簡稱 MM5)來進行模擬1998年6月4-5日的中尺度對流系(MCS)的組織發展研究,並探討MCS與中尺度渦旋(MCV)之間的關係。模式中模擬出MCV伴隨於MCS中的特性,即主對流區為正的氣旋式渦度帶,後方層狀降水區為負的反氣旋式渦度帶。這樣正負渦度對偶的情形,主要為傾斜項(tilting term)作用所造成,並增加了下游方向對流輻合的機制。在MCS發展過程中,舊對流胞所造成的層狀雲區,有助於下游方向的新對流胞發展,乃因層狀降水造成的下衝流,使得負渦度得以加強維持。此外,隨著舊對流胞之正渦度的增強發展,造成下游方向的高層風場轉變,有利於新生對流胞廣大層狀雲區的發展。這樣加強的正渦度將有助於帶來南方的暖平流,提供上升氣流所需的暖濕空氣;而增強的負渦度則有助於帶來北邊的冷平流,進一步加強冷池的發展。這些皆顯示出MCV與MCS之間的密切關係。也藉由上述的的機制發展概念,MCS呈非對稱性(asymmetric)的發展,構成了線狀組織排列的中尺度對流系統。
丘台光,1999: 華南及台灣地區中尺度對流系統分析與數值模擬研究(Ⅱ),國科會專題研究報告NSC 88-2111-M-052-004-AP6。
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