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北太平洋冬季上层海温异常的NPGO模态

吕庆平 路凯程 张铭

吕庆平, 路凯程, 张铭. 北太平洋冬季上层海温异常的NPGO模态[J]. 气候与环境研究, 2013, 18(2): 210-220. doi: 10.3878/j.issn.1006-9585.2012.11156
引用本文: 吕庆平, 路凯程, 张铭. 北太平洋冬季上层海温异常的NPGO模态[J]. 气候与环境研究, 2013, 18(2): 210-220. doi: 10.3878/j.issn.1006-9585.2012.11156
LÜ Qingping, LU Kaicheng, ZHANG Ming. NPGO Mode of the Upper Sea Temperature Anomalies in the North Pacific during Winter[J]. Climatic and Environmental Research, 2013, 18(2): 210-220. doi: 10.3878/j.issn.1006-9585.2012.11156
Citation: LÜ Qingping, LU Kaicheng, ZHANG Ming. NPGO Mode of the Upper Sea Temperature Anomalies in the North Pacific during Winter[J]. Climatic and Environmental Research, 2013, 18(2): 210-220. doi: 10.3878/j.issn.1006-9585.2012.11156

北太平洋冬季上层海温异常的NPGO模态

doi: 10.3878/j.issn.1006-9585.2012.11156
基金项目: 国家重点基础研究发展计划2007CB411805

NPGO Mode of the Upper Sea Temperature Anomalies in the North Pacific during Winter

  • 摘要: 利用较高分辨率的全球海洋同化分析系统(SODA)资料, 对冬季北太平洋上层的海温异常做了整层经验正交函数(EOF)分析, 并主要讨论了第二模态的结果。该模态空间结构与经典的北太平洋涡旋振荡(NPGO)一致, 且时间系数与NPGO指数也吻合, 故北太平洋上层海温异常EOF第二模态可称为NPGO模态。这说明NPGO现象不单纯反映在海表面温度异常上, 在上层海温中该现象也存在。在该模态空间场上, 水深100 m以上25°N~30°N的副热带处, 沿纬圈从120°E向东延伸至中东太平洋均为海温正异常带, 其北面则为负异常带, 两者构成双带系统;其中在170°W附近分别有正、负异常大值区, 中心构成南北偶极子;在本州岛以东海域, 从海表直到海洋上层底则有小范围的海温强异常。该模态空间结构的形成与大气NPO模态关系密切, 并与中纬度西风大值带上的风应力异常有关, 是造成NPGO的直接原因。该模态表现出明显的准13年年代际变化, 且对其进行5年滑动平均后发现, 从20世纪70年代中期以来, 该序列的振幅越来越大, 1976/1977年和1988/1989年的两次气候年代际突变均处该序列峰值处。引入了冬季北太平洋上层海温异常的NPGO指数, 其能更好反映海洋上层的NPGO现象及其年代际变化。
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出版历程
  • 收稿日期:  2011-10-10
  • 修回日期:  2012-08-01

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