文献类型：期刊文献

中文题名：Impact of eddies on ocean diapycnal mixing in Gulf Stream region

英文题名：Impact of eddies on ocean diapycnal mixing in Gulf Stream region

作者：Li Min[1];Xie LingLing[2];Yang QingXuan[1];Tian JiWei[1]

机构：[1]Ocean Univ China, Phys Oceanog Lab, Qingdao 266100, Peoples R China;[2]Guangdong Ocean Univ, Coll Ocean & Meteorol, Key Lab Climate Resources & Environm Continental, Zhanjiang 524088, Peoples R China

年份：2014

卷号：57

期号：6

起止页码：1407

中文期刊名：Science China Earth Sciences

外文期刊名：SCIENCE CHINA-EARTH SCIENCES

收录：SCI-EXPANDED(收录号：WOS:000336380400026)、、EI(收录号：20142217764339)、Scopus(收录号：2-s2.0-84901254416)、WOS

基金：We would like to thank anonymous reviewers for their valuable suggestions to improve the manuscript. We are also grateful to Dr. Xu Jianping and Zhang Zhiwei for providing detailed information about Argo data. This work was supported by the National Natural Science Foundation of China (Grant Nos. 41106012, 41176008, 91028008) and a grant from Sanya Institute of Deep-Sea Science and Engineering (Grant No. SIDSSE-201207).

语种：英文

中文关键词：Argo;eddies;mixing;Gulf Stream region;wind stress;overturn

外文关键词：Argo; eddies; mixing; Gulf Stream region; wind stress; overturn

中文摘要：Based on high-resolution,Array for Real-time Geostrophic Oceanography(Argo)profiles and Sea Level Anomaly(SLA)data,this study statistically analyzes and compares turbulent diapycnal mixing profiles inside and outside mesoscale eddies in the Gulf Stream region.The result indicates that average diapycnal diffusivity at 300–540 m depths in anticyclonic eddies reaches4.0×10-5 m2 s-1.This is significantly higher than the 1.6×10-5 m2 s-1 outside eddies and 0.8×10-5 m2 s-1 in cyclonic eddies.Probabilities of diapycnal diffusivity greater than 10-4 m2 s-1 within anticyclonic and cyclonic eddies and outside eddies are29%,5%and 12%,respectively.However,magnitudes of average diapycnal diffusivity at 540–900 m depths in these three cases are of the same order,10-5 m2 s-1.Twenty-four of a total 38 anticyclonic eddies had enhanced mixing in the ocean interior,and 22 were observed during or shortly after strong winds.The coincidence between enhanced mixing and strong wind stress indicates that more wind-induced,near-inertial wave energy propagates downward in anticyclonic eddies.The deeper part of 12 profiles(below 540 m)in anticyclonic eddies had vertical overturns with Thorpe scale exceeding 5 m,among which three profiles had overturns reaching 20 m.Enhanced mixing may have occurred in deep layers of some profiles,although it was not evident in average conditions.

外文摘要：Based on high-resolution, Array for Real-time Geostrophic Oceanography (Argo) profiles and Sea Level Anomaly (SLA) data, this study statistically analyzes and compares turbulent diapycnal mixing profiles inside and outside mesoscale eddies in the Gulf Stream region. The result indicates that average diapycnal diffusivity at 300-540 m depths in anticyclonic eddies reaches 4.0x10(-5) m(2) s(-1). This is significantly higher than the 1.6x10(-5) m(2) s(-1) outside eddies and 0.8x10(-5) m(2) s(-1) in cyclonic eddies. Probabilities of diapycnal diffusivity greater than 10(-4) m(2) s(-1) within anticyclonic and cyclonic eddies and outside eddies are 29%, 5% and 12%, respectively. However, magnitudes of average diapycnal diffusivity at 540-900 m depths in these three cases are of the same order, 10(-5) m(2) s(-1). Twenty-four of a total 38 anticyclonic eddies had enhanced mixing in the ocean interior, and 22 were observed during or shortly after strong winds. The coincidence between enhanced mixing and strong wind stress indicates that more wind-induced, near-inertial wave energy propagates downward in anticyclonic eddies. The deeper part of 12 profiles (below 540 m) in anticyclonic eddies had vertical overturns with Thorpe scale exceeding 5 m, among which three profiles had overturns reaching 20 m. Enhanced mixing may have occurred in deep layers of some profiles, although it was not evident in average conditions.