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Article >  Journal of Tropical Meteorology  > 2001 >  7(1): 19-28

SEASONAL AND INTER-ANNUAL VARIABILITY OF THE SOUTH CHINA SEA WARM POOL AND ITS RELATION TO THE SOUTH CHINA SEAMONSOON ONSET

  • Institute of Oceanology of Chinese Academy of Sciences

Funding:

  • The South China Sea warm pool interacts vigorously with the summer monsoon which is active in the region. However, there has not been a definition concerning the former warm pool which is as specific as that for the latter. The seasonal and inter-annual variability of the South China Sea warm pool and its relations to the South China Sea monsoon onset were analyzed using Levitus and NCEP/NCAR OISST data. The results show that, the seasonal variability of the South China Sea warm pool is obvious, which is weak in winter, develops rapidly in spring, becomes strong and extensive in summer and early autumn, and quickly decays from mid-autumn. The South China Sea warm pool is 55 m in thickness in the strongest period and its axis is oriented from southwest to northeast with the main section locating along the western offshore steep slope of northern Kalimantan-Palawan Island. For the warm pools in the South China Sea, west Pacific and Indian Ocean, the oscillation, which is within the same large scale air-sea coupling system, is periodic around 5 years. There are additional oscillations of about 2.5 years and simultaneous inter-annual variations for the latter two warm pools. The intensity of the South China Sea warm pool varies by a lag of about 5 months as compared to the west Pacific one. The result also indicates that the inter-annual variation of the intensity index is closely related with the onset time of the South China Sea monsoon. When the former is persistently warmer (colder) in preceding winter and spring, the monsoon in the South China Sea usually sets in on a later (earlier) date in early summer. The relation is associated with the activity of the high pressure over the sea in early summer. An oceanic background is given for the prediction of the South China Sea summer monsoon, though the mechanism through which the warm pool and eventually the monsoon are affected remains unclear.
  • [1] LUO Shao-hua, JIN Zu-hui.. Statistical analyses for sea surface temperature over the South China Sea, behaviorof subtropical high over the west Pacific and monthly mean rainfall over the Changjiang middle andlower reaches [J]. Scientia Atmospherica Sinica, 1986, 10: 409-418.
    [2] CHEN Lie-ting, JIN Zu-hui, LUO Shao-hua. Characteristics of sea temperature variation in the Indian Oceanand South China Sea and some of their links with the general circulation [J]. Acta Oceanologica Sinica,1985, 7: 103-110.
    [3] CHEN Lie-ting. Effect of zonal difference of sea surface temperature anomalies in the Arabian Sea and theSouth China Sea on summer rainfall over the Yangtze River [J]. Scientia Atmospherica Sinica, 1991, 15:33-42.
    [4] HE You-hai, GUAN Cui-hua. A primary study of the South China Sea warm pool [J]. Plateau Meteorology,1999, 18(4): 593-602.
    [5] SUN Shu-qing, MA Shu-jie. Characteristics of persistent anomalies in the summer monsoon of the SouthChina Sea and its relationship with the general circulation [M]. Beijing: Meteorological Press, 1999. 89-93.
    [6] XIE An, MAO Jiang-yu, YE Qian. Zonal gradient of sea temperature and the onset of South China Seamonsoon [M]. Beijing: Meteorological Press, 1999. 48-51.
    [7] ZHAO Yong-ping, CHEN Yong-li, BAI Xue-zhi, et al. Preliminary analyses of the relationship between theinter-annual variation of sea temperature in South China Sea-tropical eastern Indian Ocean and the SouthChina Sea monsoon [M]. Beijing: Meteorological Press, 1999. 117-120.
    [8] YAN Jun-yue. Climatological characteristics on the onset of the South China Sea southwest monsoon [J].Acta Meteorologica Sinica, 1997, 55: 174-185.
    [9] LIU Xia, XIE An, YE Qian, et al. The climatic characteristics of summer monsoon onset over South ChinaSea [J]. Journal of Tropical Meteorology, 1998, 14: 28-37.
    [10] National Climate Center of China Meteorological Administration. The great floods of 1998 in China andclimatic anomalies [M]. Beijing: Meteorological Press, 1998. 63-74.
    [11] HE Jin-hai, ZHU Qian-gen, MURAKAMI M. TBB data-revealed features of Asian-Australian monsoonseasonal transition and Asian summer monsoon establishment [J]. Journal of Tropical Meteorology, 1996,12: 34-41.
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赵永平, 陈永利. SEASONAL AND INTER-ANNUAL VARIABILITY OF THE SOUTH CHINA SEA WARM POOL AND ITS RELATION TO THE SOUTH CHINA SEAMONSOON ONSET [J]. Journal of Tropical Meteorology, 2001, 7(1): 19-28.
赵永平, 陈永利. SEASONAL AND INTER-ANNUAL VARIABILITY OF THE SOUTH CHINA SEA WARM POOL AND ITS RELATION TO THE SOUTH CHINA SEAMONSOON ONSET [J]. Journal of Tropical Meteorology, 2001, 7(1): 19-28.
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    SEASONAL AND INTER-ANNUAL VARIABILITY OF THE SOUTH CHINA SEA WARM POOL AND ITS RELATION TO THE SOUTH CHINA SEAMONSOON ONSET

    • Institute of Oceanology of Chinese Academy of Sciences

    Abstract: The South China Sea warm pool interacts vigorously with the summer monsoon which is active in the region. However, there has not been a definition concerning the former warm pool which is as specific as that for the latter. The seasonal and inter-annual variability of the South China Sea warm pool and its relations to the South China Sea monsoon onset were analyzed using Levitus and NCEP/NCAR OISST data. The results show that, the seasonal variability of the South China Sea warm pool is obvious, which is weak in winter, develops rapidly in spring, becomes strong and extensive in summer and early autumn, and quickly decays from mid-autumn. The South China Sea warm pool is 55 m in thickness in the strongest period and its axis is oriented from southwest to northeast with the main section locating along the western offshore steep slope of northern Kalimantan-Palawan Island. For the warm pools in the South China Sea, west Pacific and Indian Ocean, the oscillation, which is within the same large scale air-sea coupling system, is periodic around 5 years. There are additional oscillations of about 2.5 years and simultaneous inter-annual variations for the latter two warm pools. The intensity of the South China Sea warm pool varies by a lag of about 5 months as compared to the west Pacific one. The result also indicates that the inter-annual variation of the intensity index is closely related with the onset time of the South China Sea monsoon. When the former is persistently warmer (colder) in preceding winter and spring, the monsoon in the South China Sea usually sets in on a later (earlier) date in early summer. The relation is associated with the activity of the high pressure over the sea in early summer. An oceanic background is given for the prediction of the South China Sea summer monsoon, though the mechanism through which the warm pool and eventually the monsoon are affected remains unclear.

    赵永平, 陈永利. SEASONAL AND INTER-ANNUAL VARIABILITY OF THE SOUTH CHINA SEA WARM POOL AND ITS RELATION TO THE SOUTH CHINA SEAMONSOON ONSET [J]. Journal of Tropical Meteorology, 2001, 7(1): 19-28.
    Citation: 赵永平, 陈永利. SEASONAL AND INTER-ANNUAL VARIABILITY OF THE SOUTH CHINA SEA WARM POOL AND ITS RELATION TO THE SOUTH CHINA SEAMONSOON ONSET [J]. Journal of Tropical Meteorology, 2001, 7(1): 19-28.
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