太平洋北赤道逆流年际变化的特征及其影响因子分析  

The Interannual Variabilities of the Pacific North Equatorial Countercurrent and Influencing Factors

作　　者：于飞[1,2] 王启[1] 

机构地区：[1]中国海洋大学物理海洋教育部重点实验室,山东省高校海洋-大气相互作用与气候重点实验室,山东青岛266100 [2]中国人民解放军92635部队气象台,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2016年第2期6-13,共8页Periodical of Ocean University of China

基　　金：国家重点基础研究发展计划项目(2012CB417402);海洋公益性行业科研专项(201505007)资助

摘　　要：采用SODA数据资料,分析了1950—2008年太平洋北赤道逆流(NECC)的年际变化特征及其与ENSO循环的联系。研究结果表明:(1)El Nio(La Nia)盛期是NECC流量由年际异常增大(减小)到异常减小(增大)的转折点;(2)NECC流轴的纬度在El Nio(La Nia)盛期达到年际异常最南(北)端;(3)NECC流轴在深度上呈西深东浅倾斜,El Nio(La Nia)盛期倾斜最弱(强)。通过构造典型ENSO循环的海表面风应力场,驱动一层半线性约化重力数值模式,结果验证了在NECC的年际变化中海表面风应力场是关键因素,而大洋波动(Kelvin波和Rossby波)和洋流本身是海洋内部的主要动力调整机制。Based on SODA data product（1950~2008）,the interannual variabilities of the Pacific North Equatorial Countercurrent（NECC）is examined in this study.ENSO exerts a significant impact on the interannual changes of the NECC.The results prove that：（1）the interannual anomalies of NECC transport shift from increasing to decreasing during the mature period of El Nio,while that is on the opposite during the mature period of La Nia;（2）the NECC core has a more southerly position during the El Nio years,and a more northerly position during the La Nia years;（3）the NECC core is deep in the west and shallow in the east.The inclination of NECC core reaches the slightest（strongest）degree during the peak of El Nio（La Nia）.The wind-forced 1.5-layer linear reduced gravity ocean model experiments by setting composite of the sea surface wind stress curl anomalies during ENSO cycle are carried out to clarify that the sea surface wind stress plays a key role in the interannual changes of the NECC,while the tropical ocean waves（Kelvin wave and Rossby wave）and currents are the main dynamic adjustment mechanism of the ocean.

关 键 词：太平洋北赤道逆流 ENSO循环 年际变化 一层半线性约化重力数值模式 

分 类 号：P731.2[天文地球—海洋科学]