东亚盛夏北上转向台风年代际变化及与PDO的关系  

INTERDECADAL VARIATIONS OF MIDSUMMER NORTHWARD-GOING TYPHOONS OVER EAST ASIA AND THE RELATIONSHIPS WITH PACIFIC DECADAL OSCILLATION

作　　者：李辑[1] 李菲[1] 林蓉[1] 张海娜[1] 

机构地区：[1]沈阳区域气候中心,辽宁沈阳110016

出　　处：《热带气象学报》2011年第5期731-737,共7页Journal of Tropical Meteorology

基　　金：中国气象局新技术推广项目"气候变暖对东北重大气候灾害影响及预测研究"(cmatg2008m18)资助

摘　　要：利用1951—2008年台风及海温资料,分析了东亚盛夏(7—8月)北上转向台风个数的年代际变化特征及其与PDO的关系。结果表明东亚盛夏北上转向台风个数存在明显年代际变化特征,并在1978年前后发生突变。东亚盛夏北上转向台风个数与PDO关系密切,两者呈反位相关系。PDO位相转变后影响北上台风的海温关键区由赤道中东太平洋和西风漂流带区域变为黑潮区域,并且北上台风个数与各海温关键区存在时滞相关。在PDO不同位相的年代际背景下,西太副高位置的变化是北上台风个数年代际变化的原因之一。With the data of typhoon（TY） and sea surface temperature（SST） from 1951 to 2008,this article analyzes the interdecal variations of midsummer northward-going typhoons over East Asia and the relationships with Pacific decadal oscillation（PDO）.Results showed that the number of TY varies in a significant interdecal period that changed abruptly in 1978.It has a close out-of-phase relationship with the PDO.After the change in PDO phase,a key area of SST influencing the number of TY changed from the middle-east Pacific and west wind drift area to the Kuroshio current area,and the number of northward-going TY is in lagged-correlation with the key area of SST.The variation of the position changes in the western Pacific subtropical high in different PDO phase is one of the reasons of changes in the number of TY.

关 键 词：东亚盛夏北上转向台风 年代际变化 太平洋海温 PDO 副热带高压 

分 类 号：P434.4[天文地球—大气科学及气象学]