亚非夏季风的年代际变化:大西洋多年代际振荡与太平洋年代际振荡的协同作用
投稿时间:2019-10-11  修订日期:2019-10-15  点此下载全文
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作者单位E-mail
丁一汇 中国气象局 国家气候中心, 北京 100081 dingyh@cma.gov.cn 
李怡 中国气象局 公共气象服务中心, 北京 100081  
王遵娅 中国气象局 国家气候中心, 北京 100081  
司东 中国科学院大气物理所, 北京 100029  
柳艳菊 中国气象局 国家气候中心, 北京 100081  
基金项目:中国科学院A类战略性先导科技专项“泛第三极环境变化与绿色丝绸之路建设”子课题“青藏高原热源年代际变化及其对亚非季风降水的影响”(XDA20100304)
中文摘要:亚非夏季风系统包括非洲夏季风、南亚夏季风和东亚夏季风。它是全球季风系统中具有高度整体一致性变化的系统,其主要原因是亚非夏季风系统具有相同的主要驱动力:AMO(Atlantic Multidecadal Oscillation,大西洋多年代际振荡)和PDO(Pacific Decadal Oscillation,太平洋年代际振荡)海洋年代际变化模态。在此前提下,本文首先阐述了AMO对亚非夏季风的强迫作用与遥相关作用,特别强调了它在亚非夏季风及其降水年代际转型中的作用;其次讨论了PDO与冬春积雪的年代际变化对东亚夏季风雨带的协同作用;最后综合分析了AMO、PDO与IOBM(Indian Ocean Basin Mode,印度洋海盆一致模态)的协同作用,指出印度洋海洋模态在年代尺度上独立于AMO与PDO的相关组合,主要起着加强东亚夏季风活动的作用。
中文关键词:大西洋多年代际振荡(AMO)  太平洋年代振荡(PDO)  全球季风系统  亚非夏季风的协同作用
 
Interdecadal variation of Afro-Asian summer monsoon: coordinated effects of AMO and PDO oceanic modes
Abstract:The Afro-Asian summer monsoon system includes the African summer monsoon,the South Asian summer monsoon and the East Asian summer monsoon.It is considered to be a subsystem of the global monsoon system,characterized with a highly consistent variability,which is mainly due to the same main driving forces.For example,there are oceanic multi-decadal variability modes in the North Atlantic and northern Pacific oceans,which are referred to as the AMO(Atlantic Multi-decadal Oscillation) and PDO(Pacific Decadal Oscillation) oceanic modes,respectively.Therefore,starting from this point,this paper has first analyzed the forcing and teleconnection effects of the AMO mode on the Afro-Asian summer monsoon,with a special emphasis placed upon the role of the AMO in the interdecadal transitions of the Afro-Asian summer monsoon and the occurring rainfall rate.Second,this paper has discussed the coordinated effects of the PDO and the preceding winter and spring snow coverage over the Tibetan Plateau on East Asia summer monsoon rain belts.Then,on the above-mentioned basis,the coordinated effects of the AMO,PDO and IOBM(Indian Ocean Basin Mode) are clearly identified.It should be pointed out that the IOMB oceanic mode is considered to be independent from the combined effects of the AMO and PDO oceanic modes in regard to the interdecadal scale effects,and has mainly played an enhancement role in the activities of the East Asian summer monsoon.
keywords:Atlantic Multi-decadal Oscillation (AMO)  Pacific Decadal Oscillation (PDO)  global monsoon system  coordinated effects of Afro-Asian summer monsoon
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