| 索马里跨赤道气流对南海夏季风爆发的重要作用 |
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| 引用本文： | 李崇银,吴静波.索马里跨赤道气流对南海夏季风爆发的重要作用[J].大气科学,2002,26(2):185-192. |
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| 作者姓名： | 李崇银 吴静波 |
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| 作者单位： | 中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室,北京,100029 |
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| 基金项目： | 国家重点基础研究发展规划项目G1998040900、国家攀登项目"南海季风试验研究"和中国科学院KZ951-B1-408项目共同资助 |
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| 摘 要： | 通过分析NCEP/NCAR多年再分析资料,清楚地揭露了南海夏季风爆发与索马里跨赤道南风气流建立之间的重要关系.对应南海夏季风爆发,总是已先期在赤道印度洋地区有西风加强和索马里跨赤道南风气流的建立;而且,若南海夏季风爆发偏早(晚),赤道印度洋地区西风的加强和索马里跨赤道南风气流的建立也偏早(晚).可以认为,索马里跨赤道南风气流的稳定建立是南海夏季风爆发的重要物理机制之一,它的建立导致赤道印度洋地区西风的持续加强和向东扩展,并最终在南海地区形成西南气流.
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| 关 键 词： | 索马里跨赤道气流 南海 夏季风爆发 |
Important Role of the Somalian Cross-Equator Flow in the Onset of the South China Sea Summer Monsoon |
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| Li Chongyin and Wu Jingbo.Important Role of the Somalian Cross-Equator Flow in the Onset of the South China Sea Summer Monsoon[J].Chinese Journal of Atmospheric Sciences,2002,26(2):185-192. |
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| Authors: | Li Chongyin and Wu Jingbo |
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| Abstract: | Through analyses of NCEP/ NCAR reanalysis data, the important relationship between the onset of the summer monsoon in the South China Sea and the cross-equator southerly wind in the Somalia region is clearly shown. Corresponding to the outbreak of the South China Sea summer mon- soon, there are always an enhancement of the westerly wind over the equatorial Indian Ocean and an onset of cross-equator southerly wind in the Somalia region. If the outbreak of the South China Sea summer monsoon is earlier(later), the enhancement of westerly wind over the equatorial Indian Ocean and the onset of cross-equator southerly wind in the Somalia region are all earlier(later). It can be sug- gested that the steady onset of Somalian cross-equator southerly flow is one of important physical mechanisms to cause the outbreak of the South China Sea summer monsoon. The steady Somalian southerly wind will lead to an increase and eastward expanding of the westerly wind over the equatorial Indian Ocean, and then the southwesterly wind will occur over the South China Sea. |
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| Keywords: | Somalian cross-equator flow outbreak(onset) of summer monsoon South China Sea |
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