A Climatological Study of Tropical Cyclone Rainfall in Vietnam
A Climatological Study of Tropical Cyclone Rainfall in Vietnam
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DOI：
10.2151/sola.2012-011
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发表时间：
2011-11
期刊：
影响因子：
1.9
通讯作者：
H. A. Nguyen-Thi;J. Matsumoto;T. Ngo‐Duc;N. Endo
中科院分区：
文献类型：
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作者：
H. A. Nguyen-Thi;J. Matsumoto;T. Ngo‐Duc;N. Endo
摘要：本研究利用 1961-2008 年越南沿海地区 15 个气象站的热带气旋最佳轨迹数据和日降雨量数据，研究了与热带气旋 (TC) 相关的降雨特征。除了调查TC降雨量外，我们还估算了TC降雨比率和TC强降雨日数比率（TC_R50），并对厄尔尼诺和拉尼娜年的这些参数进行了解释。结果表明，北部地区TC降雨量最大出现在7月至9月，而南部站点的总降雨量主要由非TC降雨组成。 TC降雨量集中在中部地区，高峰期为10月至11月。 TC 降雨比率变化范围为 0%~25%，最大值出现在 9 月 16°N−18°N 地区。越南中中部地区9-10月TC_R50比值最大，对应同期TC最高频率。厄尔尼诺（拉尼娜）年，中部地区TC降雨比和TC_R50比值在10-11月呈现显着减少（增加）趋势。拉尼娜阶段对热带气旋降雨的影响比厄尔尼诺阶段更为强烈，特别是在越南中部。
Abstract This study investigated the characteristics of the rainfall as-sociated with tropical cyclones (TCs), using the TC best-track data and daily rainfall data from 15 meteorological stations for the period 1961−2008 for the coastal region of Vietnam. In ad-dition to investigating the TC rainfall amount, we estimated the TC rain ratio and the ratio of TC heavy rainfall days (TC_R50) and interpreted these parameters for El Nino and La Nina years. Our results show that the maximum TC rainfall occurs from July to September in the northern region, whereas the total rainfall at southern stations is mainly composed of non-TC rainfall. The TC rainfall amount is concentrated in the central region, with a peak in October-November. The TC rain ratio varies from 0 to ~25%, showing a maximum value in the region of 16°N−18°N in September. The mid-central region of Vietnam has maximum TC_R50 ratio in September-October corresponding to its highest TC frequency in the same period. During El Nino (La Nina) years, the TC rain ratio and TC_R50 ratio in the central region show a significant decrease (increase) in October-November. The La Nina phases more strongly affect TC rainfall than the El Nino phases, particularly in central Vietnam.