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Volume 24 Issue 5

Sep.  2007

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2007 >  24(5): 915-926

Interdecadal Variability of the East Asian Summer Monsoon and Associated Atmospheric Circulations

  • 1.

    Key Laboratory of Meteorology Disaster, Nanjing University of Information Science & Technology, Nanjing 210044,Key Laboratory of Meteorology Disaster, Nanjing University of Information Science & Technology, Nanjing 210044,Atmospheric Sciences Research Center (ASRC), State University of New York at Albany, Albany 12203, USA,Key Laboratory of Meteorology Disaster, Nanjing University of Information Science & Technology, Nanjing 210044


doi: 10.1007/s00376-007-0915-y

  • Based on the National Centers for Environmental Prediction and National Center for Atmospheric Research (NCEP/NCAR) reanalysis data from 1950--1999, interdecadal variability of the East Asian Summer Monsoon (EASM) and its associated atmospheric circulations are investigated. The EASM exhibits a distinct interdecadal variation, with stronger (weaker) summer monsoon maintained from 1950--1964 (1976--1997). In the former case, there is an enhanced Walker cell in the eastern Pacific and an anti-Walker cell in the western Pacific. The associated ascending motion resides in the central Pacific, which flows eastward and westward in the upper troposphere, descending in the eastern and western ends of the Pacific basin. At the same time, an anomalous East Asian Hadley Cell (EAHC) is found to connect the low-latitude and mid-latitude systems in East Asia, which strengthens the EASM. The descending branch of the EAHC lies in the west part of the anti-Walker cell, flowing northward in the lower troposphere and then ascending at the south of Lake Baikal (40o--50oN, 95o--115oE) before returning to low latitudes in the upper troposphere, thus strengthening the EASM. The relationship between the EASM and SST in the eastern tropical Pacific is also discussed. A possible mechanism is proposed to link interdecadal variation of the EASM with the eastern tropical Pacific SST. A warmer sea surface temperature anomaly (SSTA) therein induces anomalous ascending motion in the eastern Pacific, resulting in a weaker Walker cell, and at the same time inducing an anomalous Walker cell in the western Pacific and an enhanced EAHC, leading to a weaker EASM. Furthermore, the interdecadal variation of summer precipitation over North China is found to be strongly regulated by the velocity potential over the south of Lake Baikal through enhancing and reducing the regional vertical motions.
  • [1] FENG Jinming, WEI Ting, DONG Wenjie, WU Qizhong, and WANG Yongli, 2014: CMIP5/AMIP GCM Simulations of East Asian Summer Monsoon, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 836-850.  doi: 10.1007/s00376-013-3131-y
    [2] SU Tonghua, XUE Feng*, ZHANG He, 2014: Simulating the Intraseasonal Variation of the East Asian Summer Monsoon by IAP AGCM4.0, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 570-580.  doi: 10.1007/s00376-013-3029-8
    [3] Xue Feng, 2001: Interannual to Interdecadal Variation of East Asian Summer Monsoon and its Association with the Global Atmospheric Circulation and Sea Surface Temperature, ADVANCES IN ATMOSPHERIC SCIENCES, 18, 567-575.  doi: 10.1007/s00376-001-0045-x
    [4] Buwen DONG, LU Riyu, 2013: Interdecadal Enhancement of the Walker Circulation over the Tropical Pacific in the Late 1990s, ADVANCES IN ATMOSPHERIC SCIENCES, 30, 247-262.  doi: 10.1007/s00376-012-2069-9
    [5] FENG Juan*, CHEN Wen, 2014: Interference of the East Asian Winter Monsoon in the Impact of ENSO on the East Asian Summer Monsoon in Decaying Phases, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 344-354.  doi: 10.1007/s00376-013-3118-8
    [6] MAN Wenmin, and ZHOU Tianjun, 2014: Regional-scale Surface Air Temperature and East Asian Summer Monsoon Changes during the Last Millennium Simulated by the FGOALS-gl Climate System Model, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 765-778.  doi: 10.1007/s00376-013-3123-y
    [7] Chun-Ji KIM, QIAN Weihong, Hyun-Suk KANG, Dong-Kyou LEE, 2010: Interdecadal Variability of East Asian Summer Monsoon Precipitation over 220 Years (1777--1997), ADVANCES IN ATMOSPHERIC SCIENCES, 27, 253-264.  doi: 10.1007/s00376-009-8079-6
    [8] HAN Jinping, WANG Huijun, 2007: Interdecadal Variability of the East Asian Summer Monsoon in an AGCM, ADVANCES IN ATMOSPHERIC SCIENCES, 24, 808-818.  doi: 10.1007/s00376-007-0808-0
    [9] XUE Feng, ZENG Qingcun, HUANG Ronghui, LI Chongyin, LU Riyu, ZHOU Tianjun, 2015: Recent Advances in Monsoon Studies in China, ADVANCES IN ATMOSPHERIC SCIENCES, 32, 206-229.  doi: 10.1007/s00376-014-0015-8
    [10] FU Jianjian, LI Shuanglin, 2013: The Influence of Regional SSTs on the Interdecadal Shift of the East Asian Summer Monsoon, ADVANCES IN ATMOSPHERIC SCIENCES, 30, 330-340.  doi: 10.1007/s00376-012-2062-3
    [11] Yuan Zhuojian, Jian Maoqiu, 2001: Diagnostic Equations for the Walker Circulation, ADVANCES IN ATMOSPHERIC SCIENCES, 18, 166-178.  doi: 10.1007/s00376-001-0011-7
    [12] Ronghui HUANG, Yong LIU, Zhencai DU, Jilong CHEN, Jingliang HUANGFU, 2017: Differences and Links between the East Asian and South Asian Summer Monsoon Systems: Characteristics and Variability, ADVANCES IN ATMOSPHERIC SCIENCES, 34, 1204-1218.  doi: 10.1007/ s00376-017-7008-3
    [13] Ren Baohua, Huang Ronghui, 1999: Interannual Variability of the Convective Activities Associated with the East Asian Summer Monsoon Obtained from TBB Variability, ADVANCES IN ATMOSPHERIC SCIENCES, 16, 77-90.  doi: 10.1007/s00376-999-0005-4
    [14] Huang Ronghui, Wu Bingyi, Sung-Gil Hong, Jai-Ho Oh, 2001: Sensitivity of Numerical Simulations of the East Asian Summer Monsoon Rainfall and Circulation to Different Cumulus Parameterization Schemes, ADVANCES IN ATMOSPHERIC SCIENCES, 18, 23-41.  doi: 10.1007/s00376-001-0002-8
    [15] Tim LI, ZHANG Lei, Hiroyuki MURAKAMI, 2015: Strengthening of the Walker Circulation under Global Warming in an Aqua-Planet General Circulation Model Simulation, ADVANCES IN ATMOSPHERIC SCIENCES, 32, 1473-1480.  doi: 10.1007/s00376-015-5033-7
    [16] Wen CHEN, Renhe ZHANG, Renguang WU, Zhiping WEN, Liantong ZHOU, Lin WANG, Peng HU, Tianjiao MA, Jinling PIAO, Lei SONG, Zhibiao WANG, Juncong LI, Hainan GONG, Jingliang HUANGFU, Yong LIU, 2023: Recent Advances in Understanding Multi-scale Climate Variability of the Asian Monsoon, ADVANCES IN ATMOSPHERIC SCIENCES, 40, 1429-1456.  doi: 10.1007/s00376-023-2266-8
    [17] Xia ZHAO, Guang YANG, Jing WANG, 2018: Persistence of Summer Sea Surface Temperature Anomalies in the Midlatitude North Pacific and Its Interdecadal Variability, ADVANCES IN ATMOSPHERIC SCIENCES, 35, 868-880.  doi: 10.1007/s00376-017-7184-1
    [18] Botao ZHOU, Ying SHI, Ying XU, 2016: CMIP5 Simulated Change in the Intensity of the Hadley and Walker Circulations from the Perspective of Velocity Potential, ADVANCES IN ATMOSPHERIC SCIENCES, 33, 808-818.  doi: 10.1007/s00376-016-5216-x
    [19] Chen Qiying, Yu Yongqiang, Guo Yufu, 1997: Simulation of East Asian Summer Monsoon with IAP CGCM, ADVANCES IN ATMOSPHERIC SCIENCES, 14, 461-472.  doi: 10.1007/s00376-997-0064-3
    [20] YAN Hongming, YANG Hui, YUAN Yuan, LI Chongyin, 2011: Relationship Between East Asian Winter Monsoon and Summer Monsoon, ADVANCES IN ATMOSPHERIC SCIENCES, 28, 1345-1356.  doi: 10.1007/s00376-011-0014-y
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    • Manuscript History

    Manuscript received: 10 September 2007
    Manuscript revised: 10 September 2007
    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

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    Interdecadal Variability of the East Asian Summer Monsoon and Associated Atmospheric Circulations

    • 1. Key Laboratory of Meteorology Disaster, Nanjing University of Information Science & Technology, Nanjing 210044,Key Laboratory of Meteorology Disaster, Nanjing University of Information Science & Technology, Nanjing 210044,Atmospheric Sciences Research Center (ASRC), State University of New York at Albany, Albany 12203, USA,Key Laboratory of Meteorology Disaster, Nanjing University of Information Science & Technology, Nanjing 210044
    • Manuscript received: 2007-09-10
    • Manuscript revised: 2007-09-10

    Abstract: Based on the National Centers for Environmental Prediction and National Center for Atmospheric Research (NCEP/NCAR) reanalysis data from 1950--1999, interdecadal variability of the East Asian Summer Monsoon (EASM) and its associated atmospheric circulations are investigated. The EASM exhibits a distinct interdecadal variation, with stronger (weaker) summer monsoon maintained from 1950--1964 (1976--1997). In the former case, there is an enhanced Walker cell in the eastern Pacific and an anti-Walker cell in the western Pacific. The associated ascending motion resides in the central Pacific, which flows eastward and westward in the upper troposphere, descending in the eastern and western ends of the Pacific basin. At the same time, an anomalous East Asian Hadley Cell (EAHC) is found to connect the low-latitude and mid-latitude systems in East Asia, which strengthens the EASM. The descending branch of the EAHC lies in the west part of the anti-Walker cell, flowing northward in the lower troposphere and then ascending at the south of Lake Baikal (40o--50oN, 95o--115oE) before returning to low latitudes in the upper troposphere, thus strengthening the EASM. The relationship between the EASM and SST in the eastern tropical Pacific is also discussed. A possible mechanism is proposed to link interdecadal variation of the EASM with the eastern tropical Pacific SST. A warmer sea surface temperature anomaly (SSTA) therein induces anomalous ascending motion in the eastern Pacific, resulting in a weaker Walker cell, and at the same time inducing an anomalous Walker cell in the western Pacific and an enhanced EAHC, leading to a weaker EASM. Furthermore, the interdecadal variation of summer precipitation over North China is found to be strongly regulated by the velocity potential over the south of Lake Baikal through enhancing and reducing the regional vertical motions.

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