非线性作用对大洋内区跨赤道输运的影响  

Nonlinear Effects on Cross-Equatorial Transport

作　　者：柴俊炜 林霄沛 CHAI Jun-Wei;LIN Xiao-Pei(College of Oceanic and Atmospheric Science,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学海洋与大气学院

出　　处：《中国海洋大学学报（自然科学版）》2019年第12期11-16,共6页Periodical of Ocean University of China

基　　金：国家重点研究发展计划项目(2016YFA0601800)资助~~

摘　　要：风生跨赤道输运是联系南北半球物质和能量交换的重要物理过程。本文通过理想模式实验,分析了定常风强迫下理想海盆风生环流的跨赤道输运结构,发现在传统热带流胞之外,存在连接南北半球的非对称环流,影响赤道两侧上升流,使得在风应力较弱的北半球存在比风应力较强的南半球更强的上升流,同时赤道存在表层向南深层向北的经向流,赤道区域表层与下层经向流速辐散位置偏离赤道位于1°N左右的北半球。进一步分析其成因,发现在赤道区域纬向动量方程中非线性项在赤道区域与科氏力项量级相当,非线性作用的经向输运是造成赤道非对称结构形成的主要原因。The cross-equatorial structure is an important part connected the southern and northern hemispheres thermohaline and material transport.Based on an ideal model experiment,we analyze the cross-equatorial structure forced by the steady east wind.An anticlockwise circulation located between the southern and northern tropical cells was found,which enhance the upwelling in the northern hemisphere and weaken the southern one.It makes the zero point of equatorial meridional velocity locating to the north of the equator.Because the nonlinear terms have the same order of magnitude to the geostrophic terms at equator,it works on the distribution of momentum efficiently.At the same time,the fluctuated nonlinear terms effect the structure of cross-equatorial transport at equator mainly.

关 键 词：跨赤道输运结构 非线性作用 ROMS模式 

分 类 号：P731.21[天文地球—海洋科学]