| SEASONAL AND INTER-ANNUAL VARIABILITY OF THE SOUTH CHINA SEA WARM POOL AND ITS RELATION TO THE SOUTH CHINA SEA
MONSOON ONSET |
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| 作者姓名： | 赵永平 陈永利 |
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| 作者单位： | Institute of Oceanology of Chinese Academy of Sciences |
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| 摘 要： | 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.
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| 关 键 词： | South China Sea warm pool seasonal and inter-annual variability South China Sea monsoon onset |
SEASONAL AND INTER-ANNUAL VARIABILITY OF THE SOUTH CHINA SEA WARM POOL AND ITS RELATION TO THE SOUTH CHINA SEA
MONSOON ONSET |
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| ZHAO Yong-ping,CHEN Yong-Li.SEASONAL AND INTER-ANNUAL VARIABILITY OF THE SOUTH CHINA SEA WARM POOL AND ITS RELATION TO THE SOUTH CHINA SEA
MONSOON ONSET[J].Journal of Tropical Meteorology,2001,7(1):19-28. |
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| Authors: | ZHAO Yong-ping CHEN Yong-Li |
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| Institution: | Institute of Oceanology of Chinese Academy of Sciences, |
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| 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. |
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| Keywords: | South China Sea warm pool seasonal and inter-annual variability South China Sea monsoon onset |
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