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华南锋面与暖区暴雨个例对比分析 预览 被引量:55

Comparison Analysis of South China Front and Warm-Area Heavy Rain Systems in June 2006
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摘要 2005年6月17-24日,华南地区发生了连续多日的暴雨天气过程,其显著特征是存在着南北两条雨带,北支雨带(福建中北部)由准静止的梅雨锋造成,南支雨带(广东中东部)发生在锋前暖区之中,这种连续多日共存的双雨带现象引起了气象学家的广泛关注。为了探究锋面和锋前暖区暴雨的成因,加深这两类不同性质暴雨的认识,利用NCEP每6h一次的1°×1°经纬度再分析资料以及华南地区加密观测的逐小时地面降水等资料,以此次连续多日维持的双雨带降水过程为例,详细分析了锋面附近与锋前暖湿区内暴雨系统的主要物理差异。结果发现:梅雨锋暴雨和锋前暖区暴雨不仅在中尺度雨团活动、系统动力结构、大气不稳定机制和大气加热结构等存在明显的差异,而且在水汽输送、中尺度环境以及与暴雨有关的垂直环流之间也存在着不同点,这些差异可能是造成锋前暖区暴雨难以模拟和预报的主要原因。 A continuous heavy rain process occurred in South China from 17 to 24 June 2006, during which there existed two rain-bands, one in the north and the other in the south. The north rain-band (over the north and central part of Fujian Province) was resulted from frontal systems and the south rain-band (over the east and central part of Guangdong Province) was in the warm areas before a front. The double rainband phenomenon has attracted much attention of Chinese meteorologists. In order to investigate the causes of frontal and warm-area heavy rains and deepen the knowledge of the two kind heavy rains, the heavy rain case is analyzed in details as a typical example of the double rain-band event with hourly surface rainfall and 6-hour NCEP reanalysis data. The main physical differences between the frontal and warm-area heavy rains are revealed. It is found that there exist obvious differences not only in the meso-scale rain mass activities, dynamic structure, instability mechanisms, and vertical heating profiles between Meiyu front and warm-area heavy rain systems, but also in the moisture transportation, meso-scale environment and vertical circulation related to heavy rainfall. These differences may be the reason why the heavy rainfall in warm areas before a front is difficult to simulate and forecast.
作者 赵玉春 李泽椿 肖子牛 Zhao Yuchun,Li Zechun,Xiao Ziniu (1 Institute of Heavy Rain, CMA, 2 Wuhan Central Meteorological Office, Wuhan 430074; 3 National Meteorological Center, Beijing 10081)
出处 《气象科技》 2008年第1期 47-54,共8页 Meteorological Science and Technology
基金 中国气象局武汉暴雨研究所暴雨基金项目(IHR2007K04)资助
关键词 华南梅雨锋 暴雨 对流不稳定 高低空急流 Meiyu front in South China, heavy rainfall, convective instability, upper/lower level jet
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