Tide-Induced Mixing in the Bottom Boundary Layer in the Western East China Sea

作     者：GUO Zheng CAO Anzhou WANG Jianfeng GUO Zheng;CAO Anzhou;WANG Jianfeng

作者机构：Marine Science and Technology CollegeZhejiang Ocean UniversityZhoushan 316022China Ocean CollegeZhejiang UniversityZhoushan 316021China Institute of OceanologyChinese Academy of SciencesQingdao 266071China Center for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2023年第22卷第1期

页      面：1-8页

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 

基　　金：supported by the Zhejiang Provincial Natural Science Foundation of China(No.LY21D060005) the Shandong Provincial Natural Science Foundation(No.ZR2022MD082) the Joint Project of Zhoushan Municipality and Zhejiang University(No.2019C810060) the Open Fund Project of Key Laboratory of Marine Environmental Information Technology the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDA19060201). 

主　　题：tides East China Sea bottom boundary layer mixing eddy viscosity 

摘      要：The East China Sea(ECS)boasts a vast continental shelf,where strong tidal motions play an important role in the substance transport and energy budget.In this study,the tide-induced mixing in the bottom boundary layer in the western ECS is analyzed based on records measured by moored acoustic Doppler current profilers from June to October 2014.Results show that the M_(2) tide is strong and shows a barotropic feature,whereas the O_(1) tide is much weaker.Based on the M_(2) tidal currents,the eddy viscosity in the bottom Ekman boundary layer is estimated with three schemes.The estimated eddy viscosity values vary within 10^(-4)–10^(-2)m^(2) s^(−1),reaching a maximum at approximately 5 m height from the bottom and decreasing exponentially with the height at all three stations.Moreover,the shear production of turbulent kinetic energy is calculated to quantify the mixing induced by different tidal constituents.The results show that the shear production of the M_(2) tide is much stronger than that of the O_(1) tide and shows a bottom intensified feature.