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气象:2014,40(12):1530-1538
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多普勒雷达风场反演技术在西南涡暴雨过程中的应用
(1.南京信息工程大学大气科学学院,南京 210044;2.重庆市气象台,重庆 401147)
Application of Doppler Radar Wind Field Retrieval Technique to Southwest Vortex Rainstorm Process
(1.Nanjing University of Information Science and Technology, Nanjing 210044;2.Chongqing Meteorological Observatory, Chongqing 401147)
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投稿时间:2014-04-27    修订日期:2014-11-21
中文摘要: 利用多普勒天气雷达四维变分同化方法反演了2010和2013年重庆市两次西南涡内的局地强降水不同高度水平风场,分析了易发生局地强降水区域的局地环流特征。结果表明:风场反演能较准确地给出低空急流、低层辐合和局地气旋性涡旋的位置及演变情况,辐合线演变及低空急流的强度和移向对强降水有指示意义;局地气旋性涡旋越深厚,局地强降水的强度和范围越大;不同高度的气旋性涡旋耦合,可能有利于急流的加强和水汽输送。
Abstract:Horizontal wind fields in different heights were retrieved for two local severe rainfall processes within the southwest vortexes which occurred in Chongqing in 2010 and 2013, respectively, using Doppler weather radar 4DVar (four dimensional variation) assimilation technique. Local circulation patterns which are prone to local intense rainfalls are also analyzed. The results show that the position and evolution of low level jet streams, low level convergence lines and local cyclonic vortices can be accurately denoted by retrieved wind fields. The evolution of convergence lines and the intensity and transfer of low level jet streams are indicative of heavy precipitation. The deeper the local cyclonic vortex is, the greater the intensity and extension of local intense rainfall become. Coupling in cyclonic vortexes of different heights can be prone to intensification of low level jet stream and transportation of moisture.
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基金项目:公益性行业(气象)科研专项(GYHY201206028)和中国气象局预报员专项(CMAYBY2014 058)共同资助
引用文本:
刘婷婷,苗春生,张亚萍,翟丹华,邓承之,牟容,2014.多普勒雷达风场反演技术在西南涡暴雨过程中的应用[J].气象,40(12):1530-1538.
LIU Tingting,MIAO Chunsheng,ZHANG Yaping,ZHAI Danhua,DENG Chengzhi,MU Rong,2014.Application of Doppler Radar Wind Field Retrieval Technique to Southwest Vortex Rainstorm Process[J].Meteor Mon,40(12):1530-1538.