基于Argo轨迹资料反演热带太平洋中层流场条带状结构特征  

Mid-depth zonal jets and their characteristics in the tropical Pacific Ocean derived from Argo trajectory

作　　者：夏一凡[1,2] 杜岩[1,2] 王天宇[1,2] 谢强[1,3] XIA Yifan;DU Yan;WANG Tianyu;XIE Qiang(State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences),Guangzhou 510301, China;University of Chinese Academy of Sciences, Beijing 100049, China;Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China)

机构地区：[1]热带海洋环境国家重点实验室(中国科学院南海海洋研究所),广东广州510301 [2]中国科学院大学,北京100049 [3]中国科学院三亚深海科学与工程研究所,海南三亚572000

出　　处：《热带海洋学报》2017年第4期1-9,共9页Journal of Tropical Oceanography

基　　金：国家自然科学基金项目(41525019;41521005);国家海洋局"全球变化与海气相互作用"专项(GASI-IPOVAI-02);中国科学院先导专项项目(XDA11010000)~~

摘　　要：利用Argo浮标的轨迹资料估算热带太平洋中层纬向流场的条带状结构以及其变化特征。相较于传统温盐地转流算法,基于Argo轨迹资料的反演算法的优势在于不受零参考面的选取以及赤道地转平衡失效的局限。结果表明:在赤道太平洋海域,中层(1000dbar)纬向流场在南北半球都具有条带状分布,强流分布在赤道附近海域;在远离赤道海域,北半球(9°N、13°N、18°N)有相对赤道较弱的东向流动,而南半球东向流动相对更弱,没有同北半球一样明显的东向急流。此外,热带太平洋中层流场的时间变化特征较为复杂:近赤道流的变化以季节尺度为主,而远离赤道的流则逐渐演变为多时间尺度下的变化,海洋Rossby波的调整起到主导作用。The characteristics and variation of mid-depth zonal jets in the tropical Pacific Ocean are examined using the trajectory of Argo floats.The method to estimate zonal intermediate currents based on Argo trajectory data is more appropriate in the equatorial region because it is free of the restrictions imposed by the methods based on the referenced velocity and Coriolis force.The results indicate that in the equatorial Pacific Ocean,the mid-layer(1000dbar)zonal jets have a symmetric band-like structure in both Northern and Southern Hemispheres.The strong jets are centered near the equatorial regions,whereas there are several eastward zonal jets in the off-equatorial ocean(9°N,13°N,18°N).In addition,the characteristics of temporal variability are relatively complex.In the near-equatorial area,seasonal scale is the major and most important component,while in the off-equatorial region multiple time scale processes dominate.The Rossby wave dynamics and local response probably contribute to this difference.

关 键 词：热带太平洋 中层流场 条带状结构 ARGO浮标 季节变化 

分 类 号：P731.21[天文地球—海洋科学]