2015年9月西安一次强降水过程及成因的综合诊断研究  

Study of a heavy rainfall case in Xi'an in September 2015 by using SACDM

作　　者：李博[1] 张铭[1] 邹瑞森 华灯鑫[1] LI　Bo;ZHANG　Ming;ZOU　Ruisen;HUA　Dengxin(School　of　Mechanical　and　Precision　Instrument　Engineering,Xi’an　University　of　Technology,Xi’an　710048,China)

机构地区：[1]西安理工大学机械与精密仪器工程学院,陕西西安710048

出　　处：《西安理工大学学报》2018年第1期36-42,共7页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(41627807;61275185);陕西省自然科学基础研究计划资助项目(2014JQ5176);陕西省教育厅自然科学专项资助项目(15JK1506)

摘　　要：借助西安理工大学教12楼气象站观测资料、全国气象台站常规观测资料以及NCEP全球分析资料,对2015年9月9日~11日发生在西安地区的一次强降雨个例进行了综合诊断研究。结果表明:(1)200hPa高空急流与700hPa低空急流的耦合为本次强降雨提供了动力条件;(2)降雨过程中存在有利于云和降雨形成的低压槽系统;(3)源自东海与三峡两个源地的水汽在西安低空发生辐合,促使空气趋于饱和,同时北方干冷空气沿东南路径侵袭西安,造成冷暖空气交汇,进而形成降雨;(4)综合分析结果,建立了本次强降雨发生的物理模型。Based on the Xi’an University of Technology weather station data,the conventional observation data and the NCEP reanalysis data,a heavy rainfall case occurred during 9~11September 2015is studied by using the Synthetical Analysis and Classifying Diagnosis Method(SACDM).The main results are as follows:①The coupling between the 200hPa high-level jet and the 700hPa low-level jet plays an important dynamical condition for this rainfall.②The trough and wind shear together cause the heavy rainfall.③The physical conditions are favorable of the occurrence of heavy rainfall.A negative center on water vapor flux divergence is also discovered,which takes abundant water vapor and causes the air to be saturated above Xi’an.④Based on these results,aphysical model for this heavy rainfall case is established.

关 键 词：低压槽 水汽通量散度 高低空急流 物理模型 

分 类 号：P426.615[天文地球—大气科学及气象学]