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Volume 18 Issue 4

Jul.  2001

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2001 >  18(4): 497-510

Vertical Circulation Structure, lnterannual Variation Features and Variation Mechanism of Western Pacific Subtropical High

  • 1.

    Nanfing Institute of Meteorology. Nanjing 210044,LASG, lnstitute of Atmnospheric Physics, Chinese Academy of Sciences, Beijing 100029,Nanfing Institute of Meteorology. Nanjing 210044,Nanfing Institute of Meteorology. Nanjing 210044


doi: 10.1007/s00376-001-0040-2

  • The paper investigates the vertical circulation structure of the western Pacific subtropical high (STH) and its interannual variation features in relation to East Asian subtropical summer monsoon and external thermal forcing by using the high-resolution and good-quality observations from the 1998 South China Sea Summer Monsoon Experiment (SCSMEX), the NCEP 40-year reanalysis data and relevant SST and the STH parameters. It is found that the vertical circulation structures differ greatly in features between quasi-stationary and transient components of the western Pacific STH. When rainstorms happen in the rainkband of East Asian subtropical monsoon on the STH north side, the downdrafts are distinct around the ridge at a related meridian. The sinking at high (low) levels comes from the north (south) side of the STH,thereby revealing that the high is a tie between tropical and extratropical systems. The analyses of this paper suggest that the latent heat release associated with subtropical monsoon precipitation, the offshore SST and East Asian land-sea thermal contrast have a significant effect on the STH interannual anomaly. Our numerical experiment shows that the offshore SSTA-caused sensible heating may excite an anomalous anticyclonic circulation on the west side, which affects the intensity (area) and meridional position of the western Pacific STH.
  • [1] 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
    [2] Anmin DUAN, Ruizao SUN, Jinhai HE, 2017: Impact of Surface Sensible Heating over the Tibetan Plateau on the Western Pacific Subtropical High: A Land-Air-Sea Interaction Perspective, ADVANCES IN ATMOSPHERIC SCIENCES, 34, 157-168.  doi: 10.1007/s00376-016-6008-z
    [3] Xiao DONG, Feng XUE, 2016: Phase Transition of the Pacific Decadal Oscillation and Decadal Variation of the East Asian Summer Monsoon in the 20th Century, ADVANCES IN ATMOSPHERIC SCIENCES, 33, 330-338.  doi: 10.1007/s00376-015-5130-7
    [4] Shuai HU, Tianjun ZHOU, Bo WU, Xiaolong CHEN, 2023: Seasonal Prediction of the Record-Breaking Northward Shift of the Western Pacific Subtropical High in July 2021, ADVANCES IN ATMOSPHERIC SCIENCES, 40, 410-427.  doi: 10.1007/s00376-022-2151-x
    [5] Feng XUE, Fangxing FAN, 2016: Anomalous Western Pacific Subtropical High during Late Summer in Weak La Niña Years: Contrast between 1981 and 2013, ADVANCES IN ATMOSPHERIC SCIENCES, 33, 1351-1360.  doi: 10.1007/s00376-016-5281-1
    [6] Jing-Bei PENG, Cholaw BUEH, Zuo-Wei XIE, 2021: Extensive Cold-Precipitation-Freezing Events in Southern China and Their Circulation Characteristics, ADVANCES IN ATMOSPHERIC SCIENCES, 38, 81-97.  doi: 10.1007/s00376-020-0117-4
    [7] Yihui DING, Yunyun LIU, Zeng-Zhen HU, 2021: The Record-breaking Mei-yu in 2020 and Associated Atmospheric Circulation and Tropical SST Anomalies, ADVANCES IN ATMOSPHERIC SCIENCES, 38, 1980-1993.  doi: 10.1007/s00376-021-0361-2
    [8] ZONG Haifeng, 2014: A Study on the Physical Processes of the Formation of the ENSO Cycle, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 1395-1406.  doi: 10.1007/s00376-014-3224-2
    [9] Tao WANG, Qiang FU, Wenshou TIAN, Hongwen LIU, Yifeng PENG, Fei XIE, Hongying TIAN, Jiali LUO, 2023: The Influence of Meridional Variation in North Pacific Sea Surface Temperature Anomalies on the Arctic Stratospheric Polar Vortex, ADVANCES IN ATMOSPHERIC SCIENCES, 40, 2262-2278.  doi: 10.1007/s00376-022-2033-2
    [10] Xinyu LI, Riyu LU, Gen LI, 2021: Different Configurations of Interannual Variability of the Western North Pacific Subtropical High and East Asian Westerly Jet in Summer, ADVANCES IN ATMOSPHERIC SCIENCES, 38, 931-942.  doi: 10.1007/s00376-021-0339-0
    [11] 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
    [12] Zhang Qihe, Yu Shihua, 1990: Diagnosis of the Medium-Range Variation of the Subtropical High over the Western Pacific during a Meiyu Process by Three-Dimensional E－P Flux, ADVANCES IN ATMOSPHERIC SCIENCES, 7, 463-474.  doi: 10.1007/BF03342565
    [13] HU Dingzhu, TIAN Wenshou, XIE Fei, SHU Jianchuan, and Sandip DHOMSE, , 2014: Effects of Meridional Sea Surface Temperature Changes on Stratospheric Temperature and Circulation, ADVANCES IN ATMOSPHERIC SCIENCES, 31, 888-900.  doi: 10.1007/s00376-013-3152-6
    [14] Lu Riyu, 2002: Indices of the Summertime Western North Pacific Subtropical High, ADVANCES IN ATMOSPHERIC SCIENCES, 19, 1004-1028.  doi: 10.1007/s00376-002-0061-5
    [15] YANG Hui, SUN Shuqing, 2003: Longitudinal Displacement of the Subtropical High in the Western Pacific in Summer and its Influence, ADVANCES IN ATMOSPHERIC SCIENCES, 20, 921-933.  doi: 10.1007/BF02915515
    [16] XU Xiangde, ZHOU Li, ZHANG Shengjun, MIAO Qiuju, 2003: Characteristics of the Correlation between Regional Water Vapor Transport along with the Convective Action and Variation of the Pacific Subtropical High in 1998, ADVANCES IN ATMOSPHERIC SCIENCES, 20, 269-283.  doi: 10.1007/s00376-003-0013-8
    [17] Wang Shaowu, Todd P. Mitchell, John M. Wallace, 1987: ZONAL AND MERIDIONAL CIRCULATIONS IN THE EQUA-TORIALZONE AS DEDUCED FROM THE DIVERGENCE FIELD OF THE SURFACE WIND, ADVANCES IN ATMOSPHERIC SCIENCES, 4, 432-446.  doi: 10.1007/BF02656743
    [18] HU Ruijin, LIU Qinyu, WANG Qi, J. Stuart GODFREY, MENG Xiangfeng, 2005: The Shallow Meridional Overturning Circulation in the Northern Indian Ocean and Its Interannual Variability, ADVANCES IN ATMOSPHERIC SCIENCES, 22, 220-229.  doi: 10.1007/BF02918511
    [19] Li Wei, Yu Rucong, Zhang Xuehong, 2001: Impacts of Sea Surface Temperature in the Tropical Pacific on Interannual Variability of Madden-Julian Oscillation in Precipitation, ADVANCES IN ATMOSPHERIC SCIENCES, 18, 429-444.  doi: 10.1007/BF02919322
    [20] LIN Pengfei, LIU Hailong, YU Yongqiang, ZHANG Xuehong, 2011: Response of Sea Surface Temperature to Chlorophyll-a Concentration in the Tropical Pacific: Annual Mean, Seasonal Cycle, and Interannual Variability, ADVANCES IN ATMOSPHERIC SCIENCES, 28, 492-510.  doi: 10.1007/s00376-010-0015-2
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    • Manuscript History

    Manuscript received: 10 July 2001
    Manuscript revised: 10 July 2001
    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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    Vertical Circulation Structure, lnterannual Variation Features and Variation Mechanism of Western Pacific Subtropical High

    • 1. Nanfing Institute of Meteorology. Nanjing 210044,LASG, lnstitute of Atmnospheric Physics, Chinese Academy of Sciences, Beijing 100029,Nanfing Institute of Meteorology. Nanjing 210044,Nanfing Institute of Meteorology. Nanjing 210044
    • Manuscript received: 2001-07-10
    • Manuscript revised: 2001-07-10

    Abstract: The paper investigates the vertical circulation structure of the western Pacific subtropical high (STH) and its interannual variation features in relation to East Asian subtropical summer monsoon and external thermal forcing by using the high-resolution and good-quality observations from the 1998 South China Sea Summer Monsoon Experiment (SCSMEX), the NCEP 40-year reanalysis data and relevant SST and the STH parameters. It is found that the vertical circulation structures differ greatly in features between quasi-stationary and transient components of the western Pacific STH. When rainstorms happen in the rainkband of East Asian subtropical monsoon on the STH north side, the downdrafts are distinct around the ridge at a related meridian. The sinking at high (low) levels comes from the north (south) side of the STH,thereby revealing that the high is a tie between tropical and extratropical systems. The analyses of this paper suggest that the latent heat release associated with subtropical monsoon precipitation, the offshore SST and East Asian land-sea thermal contrast have a significant effect on the STH interannual anomaly. Our numerical experiment shows that the offshore SSTA-caused sensible heating may excite an anomalous anticyclonic circulation on the west side, which affects the intensity (area) and meridional position of the western Pacific STH.

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