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題名 | TAMEX 第一階段中尺度對流系統之個案研究 |
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作者姓名(中文) | 林民生; 林熺閔; | 書刊名 | 大氣科學 |
卷期 | 17:3 1989.09[民78.09] |
頁次 | 頁257-270 |
分類號 | 328.63 |
關鍵詞 | 中尺度; 中尺度實驗計畫; 第一階段; 對流系統; 臺灣區; |
語文 | 中文(Chinese) |
中文摘要 | 本文利用TAMEX第一階段實驗之第一個密集觀測(IOP I, 1986年5月10-12日)資料,診斷分析中尺度對流系統(MCS)之演化過程,及MCS所伴隨之綜觀環境條件和可能之激發機制,本文發現此個案所伴隨MCS之雲系,係源自南海區域之低層暖溼不穩定氣流與熱帶低壓氣旋式渦度環流之輻合,發展期之MCS區因水汽通量輻合小,較明顯之低層合流與低層暖平流位於雲系之東方,且缺乏高空槽線之大規模強迫舉升,導致伴隨之上升運動較弱而無明顯普遍之降水。華南地區之降水係集中於低層噴流(LLJ)之北,但臺灣地區MCS則在LLJ前端產生與加強。成熟期之MCS區,低層具有明顯之水汽通量輻合、溫度暖平流與質量輻合,高層則為強盛輻散/分流,配合南海移入之LLJ,致使伴隨之強迫上升運動增強。 |
英文摘要 | In this research, TAMEX-phase I IOP I (during May 10-12, 1986) is selected of detailed diagnostic analysis in attempting to reveal the evolution, environmental conditions and possible triggering mechanisms of the associated Mesoscale Convective systems (MCSs). It was revealed that the major convective systems of this case resulted from the convergence of low-level warm-moist unstable flow and the cyclonic circulation of the tropical disturbance over the South China Sea. The rather weak vertical motion and little precipitation within the region of developing MCS were found closely related to the insignificant low-level moisture flux convergence, the ahead-leading of the low-level convergence/warm-advection, plus the lack of large-scale upper-level trough forcing. The largely precipitating area over the southeast China was located to the north of low-level jet (LLJ), while the MCS in Taiwan area was initiated and intensified at the leading edge of LLJ. Within the region of mature MCS, the reinforcement of the upward motion owed its existence to the coupling of the significant low-level moisture flux convergence/warm-advection, LLJ and the strong upper-level divergence/diffluence. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。