摘要
利用实况高空探测、地面观测资料和T213 1°×1°格点资料,使用天气学诊断方法,对2003年8月28日出现在渭河流域的一次暴雨过程进行了综合分析。结果表明,西太平洋副热带高压加强西伸和稳定强盛有利于渭河流域强降水持续;700 hPa低涡和切变线是这次暴雨的直接影响系统;暴雨上空具有高层辐散、低层辐合的散度结构和强烈的上升运动,形成的中尺度次级环流有利于暴雨的维持;暴雨区具有强的能量锋和对流不稳定,seθ具有典型的Ω结构;其水汽主要来源于孟加拉湾和中国南海。
In this paper, a heavy rain in Weihe hasin on 28th august 2003 is studied by the synoptic meteorology and dynamical diagnosis analysis. The results show that the strong west Pacific subtropical high is beneficial to heavy rain to continue. The vortex and shear on 700 hPa level caused the heavy rain directly. There are the strong ascending motion and the structure with divergence on upper level and convergence on low level over the rainfall area to make the meso-scale secondary circulation in favor of the heavy rain maintaining. There are a strong energy＇ front, convective instability and the classical Ω structure of θse, in the rain area. The vapor is from the Bay of Bengal and the South China Sea.
出处
《暴雨灾害》
2008年第1期32-36,共5页
Torrential Rain and Disasters
基金
中国气象局新技术推广预报员专项(CMATG2005Y09)资助
关键词
致洪暴雨
诊断分析
次级环流
能量锋
Flood heavy rain
Diagnosis
Secondary circulation
Energy front
