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大气科学  2006 

印度洋海温异常和南海夏季风建立迟早的关系Ⅱ.机理分析

DOI: 10.3878/j.issn.1006-9895.2006.06.08

Keywords: 印度洋,海温异常,南海夏季风,建立迟早

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Abstract:

通过区分ENSO外部影响和偶极子内部局地作用,探讨了前期春季的印度洋海温异常对南海夏季风建立早晚的可能影响途径.结果表明:在没有去除ENSO信号(外部作用)的情况下,全区一致型的海温分布主要通过影响热带印度洋上空纬向季风环流的强弱来影响南海夏季风建立的早晚.去除ENSO信号后,非ENSO全区一致型的海温分布则主要通过影响低层东西向的气压差异和对流层中上层的南北温度梯度的逆转,进而对南海夏季风建立的早晚产生影响;而南印度洋偶极子(SIODM)型的海温分布则主要通过影响亚洲大陆热低压、西太平洋副热带高压和高低层的辐合辐散运动影响南海夏季风的建立.

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