摘要
对2009年5月9—10日山东切变线暴雨过程进行诊断分析,结果发现:该暴雨过程是在比较有利的天气背景条件下发生的,副热带高压强盛稳定,高空西风槽、低层切变线和地面倒槽是此次暴雨的影响系统;低空急流和地面冷锋是不稳定能量的触发机制;中尺度对流云团活动频繁,是造成暴雨的直接影响系统;暴雨落区与水汽、涡度、层结稳定度指数等环境物理量有较好的对应关系。
The course of a shear line rainstorm in Shandong provice from May 9 to May 10 in 2009 was generally diagnosed and analyzed.The results showed that：the rainstorm happened in favorable weather background.In the situation the subtropical high was stable,and the upper westerly trough,low-level shear line and ground inverted through were the main influnced systems.The low level jet and cold front could trigger the release of the unstable energy.The high frequence of mesoscale-convective cloud cluster was the direct influenced system.There was corresponding relation between rainstorm zone and environmental physical values such as vapor,vorticity and stability index.
出处
《现代农业科技》
2010年第8期285-287,289,共4页
Modern Agricultural Science and Technology
关键词
暴雨
切变线
低空急流
诊断分析
rainstorm
shear line
low level jet
diagnostic analysis
