摘要
利用雷达径向速度、风暴相对径向速度和风廓线产品以及数值预报产品和雨量资料,分析了临沂2008年汛期中最大也是最后一场大暴雨过程中短时强降水发生机制。结果发现:在有利的大尺度环流背景形势下,中小尺度系统的生成是短时强降水产生的原因。分析还表明:低空西南气流的稳定维持利于降水过程持续,而高空气流的短波波动则造成降水强度的强弱波动变化;当高空气流由偏西风转为西南风,中低空西南气流和中高空西南气流同向叠加时,对流层中层西南急流建立并且向超低空传递,高空冷空气的加入和低层西南气流加强促使中小尺度系统生成,导致短时强降水。
By using radar radial velocity,storm relative radial velocity and wind velocity profile as well as numerical prediction products and information on rainfall,mechanisms of short-time rainfall in the process of the biggest and the last strong rainfall in 2008 in Linyi are analyzed.it is found that the appearance of small and medium-scale system is causes of short-time heavy rainfall under the favorable situation of the large circulation.The analysis also showed that the maintenance of stable low-level jet is useful to continuing the process of precipitation,and the precipitation intensity changes are caused by high-level jet volatility,and the middle-level troposphere southwest jet is established and strengthened when the upper air current is combined with the low-level current,and medium-scale system generated,and then short-term strong rainfall is produced.
出处
《气象科学》
CSCD
北大核心
2010年第3期407-413,共7页
Journal of the Meteorological Sciences
基金
山东省气象局重点科研课题(2008sdqxz20)
临沂市科技发展计划项目(080203063)
关键词
暴雨
风廓线
机制分析
Strong rainfall Wind velocity profile Analysis of mechanism
