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大气科学  2006 

东亚-北太平洋偶极型气压场及其与东亚季风年际变化的关系

DOI: 10.3878/j.issn.1006-9895.2006.02.13

Keywords: 东亚-太平洋偶极子,东亚副热带季风,年际变率

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Abstract:

利用美国NCEP/NCAR的月平均再分析资料,研究东亚-太平洋地区地面气压的耦合模态与东亚副热带季风异常的关系,结果表明:在亚洲大陆和北半球太平洋之间气压场的偶极子模态主要反映了东亚地区东西向气压梯度的异常.从20世纪60年代到70年代中期,东亚-太平洋的这种偶极子表现为蒙古地区气压偏低和太平洋地区气压偏高的特征,而从20世纪70年代后期到90年代,则表现为蒙古地区气压偏高和太平洋地区气压偏低的特征.在偶极子指数值较高的年份,冬季(或夏季)蒙古高压(或蒙古低压)和太平洋阿留申低压(或太平洋副热带高压)较强

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