摘要
基于NCEP/NCAR再分析格点资料,利用波包传播诊断方法(WPD)诊断分析了2007年重庆"7.17"强降水过程,研究了高频波波包分布和传播特征与降水的关系。结果表明,波包能明显反映出降水过程的发生、维持和结束特征。500hPa层次上,在降水发生前,主降水区域波包值突然增大,之后随着降水的发生,强度略为减小,但仍维持在较强位相,在降水过程基本结束之前,波包值突然减小为正常值;波包的经向和纬向传播特征表明,本次降水主要受孟加拉湾地区强波包中心及高原地区波包传播的影响。
Based on the NCEP/NCAR reanalysis data, using the Wave-packet propagation diagnosis （WPD）, ＂7.17＂ Heavy Rainfall in Chongqing of 2007 was analyzed studying the relations between distribution and propagation characteristics of high-frequency wave packet and rainfall. The main results showed that the wave-packet value could reflect the characteristics of the beginning, maintenance and ending of the precipitation process. The value of the lower-to-upper layer suddenly increased just before the heavy rainfall occurred. With the rainfall occurring the wave packet became weaker and the value was in the strong phase. The value dropped abruptly to be normal just before rainfall was over. The heavy rainfall was affected by the wave packets propagated from the Bay of Bengal and plateau.
出处
《暴雨灾害》
2009年第2期126-130,共5页
Torrential Rain and Disasters
基金
成都信息工程学院自然科学与技术发展基金项目(CSRF200602)
中国气象局高原大气研究所开放基金项目
国家自然科学基金(40675059)共同资助
关键词
暴雨
波包传播诊断方法(WPD)
波包特征
Heavy Rainfall process
Wave-packet propagation diagnosis （WPD）
Characteristics of Wave-Packet
