违反了 PRIMARY KEY 约束 'PK_t_counter'。不能在对象 'dbo.t_counter' 中插入重复键。 语句已终止。 两类厄尔尼诺型对西北太平洋季风槽及热带气旋生成的可能影响-Possible impact of Two Types of El Ni?o Events on the western North Pacific Monsoon Trough and Tropical Cyclogenesis
doi:  10.3878/j.issn.1006-9585.2017.17055
两类厄尔尼诺型对西北太平洋季风槽及热带气旋生成的可能影响

Possible impact of Two Types of El Ni?o Events on the western North Pacific Monsoon Trough and Tropical Cyclogenesis
摘要点击 117  全文点击 49  投稿时间:2017-03-29  最后修改时间:2017-05-02
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基金:  国家自然科学基金,国家重点基础研究规划项目
中文关键词:  中太平洋增暖  东太平洋增暖 西北太平洋  季风槽 热带气旋(TC)
英文关键词:  central  Pacific warming (CPW), eastern  Pacific warming (EPW), western  North Pacific, monsoon  trough, tropical  cyclone (TC)
        
作者中文名作者英文名单位
张宏杰ZHAN Hongjie中国科学院大气物理研究所季风系统研究中心;中国科学院大学地球科学院
武亮WU Liang中国科学院大气物理研究所季风系统研究中心
黄荣辉Huang rong hui中国科学院大气物理研究所季风系统研究中心
引用:张宏杰,武亮,黄荣辉.2017.两类厄尔尼诺型对西北太平洋季风槽及热带气旋生成的可能影响[J].气候与环境研究
Citation:ZHAN Hongjie,WU Liang,Huang rong hui.2017.Possible impact of Two Types of El Ni?o Events on the western North Pacific Monsoon Trough and Tropical Cyclogenesis[J].Climatic and Environmental Research(in Chinese)
中文摘要:
      本文通过对1948-2015年不同El Ni?o事件下西北太平洋季风槽变化和热带气旋(TCs)生成进行了分析,初步探讨了不同El Ni?o型事件对季风槽及其对热带气旋的可能影响。分析结果表明,与东太平洋增暖(EPW)年相比,中太平洋增暖(CPW)年季风槽偏弱,位置相对偏西、偏北。在CPW年,中(西和东)太平洋海温增暖(降低)引起了从中到西太平洋热带地区的西风异常和中太平洋地区上升运动及对流活动加强,使得季风槽加强东伸,同时西太平洋副热带高压偏弱、偏北,西北太平洋季风槽北推;而在EPW年,赤道东(西)太平洋海温增暖(降低)使得赤道地区西风异常显著加强东扩,异常Walker环流的上升支东移至东太平洋,季风活动加强,副高偏强、偏南,这使得季风槽较CPW年相比更强、更偏东。进一步研究表明,随着西北太平洋季风槽强度和位置的变化,利于TCs生成的大尺度环境因子随之发生了改变。在CPW年,对流层低层气旋性涡度、高层辐散、高的中层相对湿度以及低垂直风切变区的位置随着季风槽向北移动;而在EPW年,这些环境因子随季风槽向南、向西偏移。这些大尺度环境因子的变化使得西北太平洋TCs生成的位置在CPW年比EPW年更加偏北、偏东。
Abstract:
      The present study analyzes the monsoon trough and tropical cyclones (TCs) genesis over the western North Pacific to investigate preliminarily the anomalous monsoon trough and its possible effect on TCs during the different kinds of El Ni?o events for the period of 1948-2015. It is shown that as compared with the eastern Pacific warming (EPW) years, the monsoon trough is weaker and its position leans toward the west and north during the central Pacific warming (CPW) years. In these years, the warmer (cooler) surface sea temperature (SST) over the central (western and eastern) Pacific induces the anomalous westerly wind from the central to the western Pacific in the tropical region and the stronger ascending motion and convective activity over the central Pacific, which can induce the strengthened and eastward extension of the monsoon trough. Meanwhile, the western Pacific subtropical high is weak and its location is to the north, which lead to the monsoon trough moving northward; but during EPW years, the warmer (cooler) SST over the eastern (western) equatorial Pacific, the anomalous westerly wind extending eastward significantly in the tropics, the updraft of the anomalous Walker circulation eastward to the eastern Pacific, the stronger monsoon activity and the reinforcement subtropical high leaning toward the south, which can induce the stronger monsoon trough with more eastward position than in CPW years. Further study reveals that the lager environmental factors which are related to TCs genesis change along with the intensity and position of the monsoon. During CPW years, the cyclonic vorticity in the lower troposphere, the upper-level divergence, the higher relative humidity in the middle troposphere and the lower vertical wind shear vary with the monsoon location toward the north; but in EPW years, these factors change with the monsoon trough and move south and west. These changes prompt the location of TCs genesis over the wester North Pacific to lean toward more north and east than in EPW years.
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