梅雨期間台灣豪雨之個案分析探討

The Investigation on Severe Preciptation during Taiwan Mei-Yn Season

梁瑞禎(Jui-Chen Liang) ； 徐天佑(Tian-Yow Shyu) ； 潘大綱(Da-Gang Pan)

《大氣科學》 13卷1期 (1986/03) Pp. 109-120

摘要

每年之梅雨期間，台灣地區往往因中尺度對流雲系之作用產生豪雨。本文針對民國70年5月28日，73年6月3日及6月10月梅雨期間之豪雨個案詳加分析，希望能對此三個個案所造成豪雨之因素有進一步之瞭解。根據分析的結果顯示，雖然綜觀條件上皆由於梅雨鋒之影響，造成綜觀條件上有利降雨產生，但是觸發中尺度對流系統之增強進而導致豪雨的原因，在三次分析中卻不盡相同，就三次個案而言1.「五二八」豪雨乃是由於內重力波所激發形成。2.「六三」豪雨是由低層旺盛之西南噴流與高層噴流之間交互作用所產生。3.「六十」豪雨由鋒前之大氣不穩定與午後強烈對流所引起。

並列摘要

Heavy rainfall, which was caused by obvious meso-scale convective cloud systems in the vicinity of Taiwan during Mei-Yu season, brought us tremendous damages both in lives and properties. We analyzed 3 cases of heavy rain, which occurred on May 28 1981, June 3 1984 and June 10 1984 respectively, in order to further understand the causes of heavy rainfall in Taiwan. In our study, we found that the favourable synoptic situation was the Mei-Yu front, but the triggering mechanisms for severe mesoscale convective systems were quite different from each cases. From the results of our analysis, our concludings are:1. Heavy rain on May 28, 1980 was triggered by internal gravity waves.2. Heavy rainfall on June 3, 1984 was triggered by the interaction between upper level jet and low level jet.3. Severe thunderstorm on June 10, 1984 was caused by pre-front instability and strong thermal convection.