山东特大暴雨雷达回波及地形作用分析
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作者单位
高留喜1,王彦2,万明波1,刘畅  
基金项目:国家自然科学基金资助项目(40975026);山东省气象局重点课题(2009sdqxz03);山东省科技发展计划项目(2010GSF10805)
中文摘要:利用常规、非常规资料对2009年8月17—18日山东省出现的特大暴雨过程进行分析。结果表明:“817”特大暴雨主要出现在西风槽东移、副高南退时的副高西北侧边缘,对流有效位能(CAPE)等热力环境指数对鲁南强降水有较强的反应能力。降水分布具有典型的地形影响特征,复杂山地地形对降水有显著增幅作用和对对流系统传播的阻碍作用。存在低空急流和列车效应,强回波维持时间较长是费县出现强降水的重要原因,较强的偏南气流、湿度层深厚是费县出现特大暴雨的根本原因。地形影响气流理论很好地解释了山东“817”特大暴雨降水分布,费县特殊地形对特大暴雨有很大贡献。雷达资料可以弥补常规观测的不足;地形对强降雨及其分布有重要影响。
中文关键词:暴雨  副热带高压  雷达回波  急流  地形作用
 
A study on radar echo and the impact of terrain on the heavy torrential rainfall event in Shandong Province on 17 August 2009
Abstract:A heavy torrential rainfall process during August 17 and 18,2009 is analyzed by using both normal and abnormal data such as radar data.The results show that:1) the torrential rainfall mainly occurred in the border district of northwest subtropical high when the trough moved eastward and the subtropical high moved backward to the south;2) some thermal environmental indexes like CAPE presented good corresponding relationship with intensive rainfalls in south Shandong province;3)distribution of precipitation was profoundly affected by the topographic condition;the complex topography of mountains in Shandong Province can lead to significant precipitation amplification and block the movement of the convective systems;4) low jet stream and train effects existed in the torrential rainfall;the strong radar echo lasting for a long time is the main reason for the heavy rain in Feixian;the strong southerly flow and the thick moist air are the leading factors for the torrential rainfall;5) the theory of the impact of terrain on precipitation well explains the distribution of precipitation in this torrential rainfall progress;6) the special terrain of Feixian contributes to the heavy rainfall greatly.Radar data is a good supplement to normal observational data.The impact of terrain exerts important influence on strong precipitation and its distribution.
keywords:torrential rainfall  subtropical high  radar echo  jet stream  terrain effect
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