| PDO对西太平洋副热带高压年代际东退的可能贡献 |
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| 作者单位： | Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing, China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing, China;Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China;Dalian Meteorological Bureau of Liaoning Province, Dalian, China |
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| 基金项目： | the National Key Research and Development Program of China，grant number 2016YFA0600703;This study was funded by the Major Program of the National Natural Science Foundation of China，grant number 41991283;and the Funding of the Jiangsu Innovation & Entrepreneurship Team,the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions |
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| 摘 要： | 以往的研究已证实,西太平洋副热带高压(副高)在1970s后期减弱东退.基于大气模式(CAM4)的理想型海温强迫试验,结果表明:副高的东退可能是大气对于正位相太平洋年代际振荡(PDO)的相应.伴随着PDO转变为正位相,西太平洋至印度半岛以及热带东太平洋的对流加热增强,大气表现为Gill型响应,在亚洲大陆至西太平洋上空低层产生气旋性异常,有利于副高东退.同时,高层产生反气旋异常,使得东亚西风急流加强和向南扩展,进而调节西太平洋上空的次级环流,进一步有利于副高东退.
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| 关 键 词： | 西太平洋副热带高压 太平洋年代际振荡 年代际气候变化 |
Possible contribution of the PDO to the eastward retreat of the western pacific subtropical high |
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| Authors: | Qi Tong Yanyan Huang Mingkeng Duan Qianfei Zhao |
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| Abstract: | Previous studies have demonstrated that the western Pacific subtropical high (WPSH) has experienced an eastward retreat since the late 1970s.In this study,the authors propose that this eastward retreat of the WPSH can be partly attributed to atmospheric responses to the positive phase of the Pacific decadal oscillation (PDO),based on idealized SST forcing experiments using the Community Atmosphere Model,version 4.Associated with the positive phase of the PDO,convective heating from the Indian Peninsula to the western Pacific and over the eastern tropical Pacific has increased,which has subsequently forced a Gill-type response to modulate the WPSH.The resulting cyclonic gyre over the Asian continent and the western Pacific in the lower troposphere is favorable for the eastward retreat of the WPSH.Additionally,the resulting anticyclonic gyre in the upper troposphere is favorable for the strengthening and southward expansion of the East Asian westerly jet,which can modulate the jet-related secondary meridional-vertical circulation over the western Pacific and promote the eastward retreat of the WPSH. |
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| Keywords: | Western pacific subtropical high Decadal climate variation Pacific decadal oscillation |
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