2008年6月广东沿海一次对流线的演变与结构特征  

Evolution and structure of a convection line over coastal region of South China in June 2008

作　　者：孙建华[1] 

机构地区：[1]中国科学院大气物理研究所,北京100029

出　　处：《暴雨灾害》2012年第3期201-209,共9页Torrential Rain and Disasters

基　　金：国家自然科学基金项目(41075032);中国气象局公益类行业专项(GYHY200906004)

摘　　要：利用NCEP 1°×1°再分析资料、FY-2C TBB资料、多普勒雷达资料、自动气象站观测资料以及常规气象观测资料,对2008年6月16—17日广东沿海对流线造成的暴雨过程进行观测资料分析与模拟研究。结果表明,该对流线发生在南海北部,然后向北移动,在到达海岸线附近时开始加强,最强降水区位于地面辐合线南侧;对流线在海岸线附近的加强过程,是由于"海岸锋"的作用使辐合加强所致;海岸锋形成的辐合由其南侧的西南风与北侧的偏东风造成;数值模拟再现了对流线到达沿海增强、北移到大陆上后减弱的过程,辐合线到达海岸线附近时最强,从而增强了对流线上的上升运动和对流,使对流可发展到对流层中上层。NCEP 1 °× 1 ° reanalysis data, FY-2C TBB data, Dopplar radar data, automatic weather station data and conventional observa- tional data were utilized to study a heavy rain process associated with convection line over Guangdong province on 16-17 June 2008 by using the observation data analyses and simulation. The results indicate thai the convection line occurred over northern South China Sea, moved northwards, and it began to intensify while it approached the coastline of Guangdong province. The heavy rainfall occurred to the south of con- vection line. The intensification of convection line close to coastline was the result of convergence enhanced by the coastal front. The hourly surface wind analysis indicated that convergence line was formed between southwesterlies to the south of the coastal front and easterlies to the north of the coastal front. The numerical simulation reproduced the process showing that convection line was strengthened when it got to in- shore and weakened when it moved northwards to the continent, and convergence line reached the highest intensity when it approached coast- line, thus upward motion and convection along the convection line were enhanced making convection extend up to middle-upper troposphere.

关 键 词：对流线 暴雨 海岸锋 数值模拟 

分 类 号：P458.121.1[天文地球—大气科学及气象学]