摘要
利用常规气象资料和NCEP/NCAR再分析资料,对2011年6月23日-24日华北一次局地暴雨天气过程进行分析。结果表明:暴雨是暖湿空气与低层冷空气配合引起的;湿位涡的分布对暴雨的落区有较强的指示性作用,暴雨发生在MPV1的的正负过渡带,MPV与MPV2的负值区内;位于中低层(500hPa以下)的强烈水汽辅合层以及深厚的湿层为暴雨的产生提供了充沛水汽;高能区的垂直分布,有利于强降水的发生发展;低层辐合、高层辐散的散度场以及涡度的动力耦合作用表明此次暴雨具备了较强的动力上升运动条件。
Based on the meteorological observation data and NCEP/NCAR reanalysis data,rainstorm of local region in Northern China on 23-24 June 2008 was discussed.The results show that: rainstorm is caused by warm moist air and cold air at low level.Distribution of moist potential vorticity has strong indication about rainstorm area.Rainstorm occurs in positive and negative transition zone of MPV1 and negative area of MPV and MPV2.Combining layer of water vapor and deep moist layer of middle-low layer under 500hPa provide plentiful water vapor for developing rainstorm.The vertical distribution of high region is favorable for the occurrence and development of heavy precipitation.Divergence combining in low layer and scattering in high layer and dynamic coupling effect of the vorticity show that the local rainstorm possesses strong upward motion conditions.
出处
《中国人口·资源与环境》
CSSCI
北大核心
2012年第S2期218-221,共4页
China Population,Resources and Environment
基金
河北省气象局科研开发项目(编号:11KY32)
关键词
暴雨
湿位涡
诊断分析
rainstorm
moist potential vorticity
diagnostic analysis
