摘要
【目的】揭示太平洋南赤道流(SEC)体积输运的年际变异规律,及其与ENSO(El Niño–Southern Oscillation)和IOD(Indian Ocean Dipole)的关系。【方法】基于与现场观测海流对比良好的长时间序列的海洋再分析资料(1958-2015),研究太平洋SEC的空间结构及其体积输运的年际变化特征,探讨ENSO和IOD对SEC体积输运年际变异的调节作用。【结果和结论】SEC主要分布在24°S-5°N,流核位于26.0σθ等密度面之上,在中太平洋海盆具有最大体积输运和年际变率。ENSO和IOD共同调节着太平洋SEC的年际变异,在二者的正(负)位相期间,SEC体积输运减弱(增强),二者影响SEC年际变异的关键因素分别是赤道西中太平洋和东太平洋的西风(东风)异常。
【Objective】To reveal the interannual variability of the volume transport of the Pacific South Equatorial Current(SEC),and its relationship with ENSO(El Niño–Southern arbitration)and IOD(Indian Ocean dipole).【Method】Analyze the spatial structure as well as the interannual variability of the Pacific SEC using long-term time series of ocean reanalyses which coincide well observational currents(1958-2015),and examine how the ENSO and IOD modulate the variations of the SEC on interannual timescales.【Result and Conclusion】The SEC is mainly located between 24°S and 5°N,and above 26.0σθisopycnals in the vertical direction.The mean volume transport as well as the interannual variability of the SEC is largest in the central Pacific basin.Both ENSO and IOD modulate the interannual variability of the Pacific SEC,with the volume transport of the SEC weakening(strengthening)during their positive(negative)phases.The key factors that ENSO and IOD in positive(negative)phases impact the interannual variability of the SEC are westerlies(easterlies)respectively in the equatorial central-west Pacific and in the equatorial eastern Pacific.
作者
杨丽娜
吴奇儒
陈旺
刘成龙
梁朋
YANG Li-na;WU Qi-ru;CHEN Wang;LIU Cheng-long;LIANG Peng(College of Ocean and Meteorology,Guangdong Ocean University,Zhanjiang 524088,China;Zhuhai Marine Environmental Monitoring Center of The State Oceanic Administration,Zhuhai 116023,China;Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266200,China)
出处
《广东海洋大学学报》
CAS
北大核心
2021年第6期36-43,共8页
Journal of Guangdong Ocean University
基金
国家自然科学基金青年基金项目(41706033,42006023)
广东海洋大学科研启动费资助项目(R20020,R20023)。
关键词
太平洋南赤道流
年际变异
ENSO
IOD
Pacific South Equatorial Current
interannual variability
ENSO
IOD
