| 越赤道气流的季节变化及其对南海夏季风爆发的影响 |
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| 引用本文： | 高辉,薛峰.越赤道气流的季节变化及其对南海夏季风爆发的影响[J].气候与环境研究,2006,11(1):57-68. |
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| 作者姓名： | 高辉 薛峰 |
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| 作者单位： | 1. 国家气候中心,北京,100081
2. 中国科学院大气物理研究所,北京,100029 |
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| 基金项目： | 中国科学院知识创新工程项目KZCX3-SW-221，国家自然科学基金资助项目40233027、40221503 |
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| 摘 要： | 基于NCEP/NCAR资料分析了对流层越赤道气流的季节变化,指出越赤道气流中心在低层位于925hPa,在高层位于150 hPa。东半球的越赤道气流是一种典型的季风型气流,而西半球越赤道气流具有信风特征。研究结果还表明,低层的索马里和南海越赤道气流对南海夏季风的爆发有至关重要的作用,在季风爆发前2候,索马里急流有一次迅速的增强,这一增强有利于加速孟加拉湾地区西风的向东扩展,并使控制在南海上空的西太平洋副高东撤;同时,南海越赤道气流的迅速增强也推动副高北上,共同促使南海夏季风全面爆发。不仅如此,二者对季风爆发的早晚也有重要影响,当前期这两支越赤道气流建立偏早、强度偏强时,南海夏季风爆发易偏早。反之,当其建立偏晚、强度偏弱时,季风爆发易偏晚。
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| 关 键 词： | 越赤道气流 季节变化 南海夏季风 |
| 文章编号： | 1006-9585(2006)01-0057-12 |
| 收稿时间： | 07 14 2004 12:00AM |
| 修稿时间： | 08 11 2005 12:00AM |
Seasonal Variation of the Cross-equatorial Flows and Their Influences on the Onset of South China Sea Summer Monsoon |
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| GAO Hui and XUE Feng.Seasonal Variation of the Cross-equatorial Flows and Their Influences on the Onset of South China Sea Summer Monsoon[J].Climatic and Environmental Research,2006,11(1):57-68. |
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| Authors: | GAO Hui and XUE Feng |
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| Institution: | 1.National Climate Center, Beijing 100081 ;2.Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | Based on NCEP/NCAR reanalysis data,the seasonal variation of the cross-equatorial flows(CEFs) is analyzed.It is shown that,in the lower and upper level of the troposphere,the CEFs centers are located in 925 hPa and in 150 hPa,respectively.Besides,the CEFs are monsoonal types in the Eastern Hemisphere while they are characterized by the trade winds in the Western Hemisphere.Moreover,the Somali CEF and the South China Sea CEF play crucial roles in the onset of the SCS summer monsoon(SCSSM).Two pentads prior to the onset of SCSSM,there was a rapid enhancement of the Somali CEF,which accelerates the eastward extension of the westerlies over the Bay of Bengal and the eastward retreat of the western Pacific subtropical high over the South China Sea(SCS).In the meantime,the rapid enhancement of the CEF in the SCS is advantageous to the northward march of the subtropical high.The SCSSM starts finally under the common actions of the two CEFs.Furthermore,the SCSSM onset tends to occur earlier when the two CEFs are stronger and establish earlier,and vice versa. |
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| Keywords: | Cross-equatorial flow seasonal variation South China Sea summer monsoon |
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