华南6月持续性致洪暴雨与孟加拉湾对流异常活跃的关系
投稿时间:2006-06-06  修订日期:2006-07-31  点此下载全文
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作者单位
许晓林 南京信息工程大学, 大气科学学院, 江苏, 南京, 210044 
徐海明 南京信息工程大学, 大气科学学院, 江苏, 南京, 210044 
司东 南京信息工程大学, 大气科学学院, 江苏, 南京, 210044 
基金项目:国家重点基础研究发展计划项目(2004CB418304);国家自然科学基金资助项目(40575045)
中文摘要:利用NCEP/NCAR再分析逐日及逐月资料、NOAA卫星观测的向外长波辐射(Outgoing Long-wave Radiation,OLR)资料、我国160站月降水资料及华南45站逐日降水资料,分析了2005年6月华南持续性致洪暴雨的发生与孟加拉湾对流异常活跃及西太平洋副热带高压演变的关系,并对华南6月有持续性大范围暴雨年进行合成分析,结果表明华南持续性大范围暴雨发生的年份,孟加拉湾对流相对活跃,西太平洋副高强度偏强、位置偏西;反之亦然。华南6月持续性大范围暴雨发生前,孟加拉湾对流经历了一次活跃过程,同时西太平洋副高也明显经历了一次增强西伸过程。孟加拉湾对流活跃可能通过东西向垂直环流诱使西太平洋副高增强西伸,从而对华南暴雨的形成产生影响。
中文关键词:华南持续性致洪暴雨  孟加拉湾对流  西太平洋副热带高压
 
Relationship between June Sustained Torrential Rain in South China and Anomalous Convection over the Bay of Bengal
Abstract:Using the daily and monthly NCEP/NCAR reanalysis data,Outgoing Longwave Radiation (OLR) data,monthly precipitation of 160 stations in China and daily precipitation of 45 stations in South China,relationships among sustained torrential rain in South China,anomalous convection over the Bay of Bengal and evolution of the western Pacific Subtropical High in June 2005 are analyzed.The years with and without June sustained torrential rain in South China are investigated by means of composite analysis.The results show that,in years with June heavy rainfall events,convections are relatively active over the Bay of Bengal,the western Pacific subtropical high are enhanced and westward stretched;and vice verse.Results further indicate that the heavy rains in South China are closely related to the abnormally active convection over the Bay of Bengal,and the enhancement and westward extension of the western Pacific Subtropical High obviously.The anomalously active convection over the Bay of Bengal may induce the enhancement of the western Pacific Subtropical High as well as its westward extension by latitudinal vertical circulation,then influencing the heavy rain in South China.
keywords:sustained torrential rain in South China  convection over the Bay of Bengal  western Pacific Subtropical High
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