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 Nio(La Nia)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 Nio(La Nia)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 Nio(La Nia)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 Nio,while that is on the opposite during the mature period of La Nia;（2）the NECC core has a more southerly position during the El Nio years,and a more northerly position during the La Nia 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 Nio（La Nia）.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.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
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
