Vertical Structure of the Tidal Currents on the Continental Shelf of the East China Sea  

作　　者：LI Lei JIANG Weiwei LI Peiliang YANG Bo 

机构地区：[1]Laboratory of Physical Oceanography,Ocean University of China,Qingdao 266100,P.R.China [2]National Marine Environmental Monitoring Center,Dalian 116023,P.R.China

出　　处：《Journal of Ocean University of China》2012年第3期347-353,共7页中国海洋大学学报（英文版）

基　　金：supported by the National Basic Research Program of China (2007CB411807);the National Natural Science Foundation of China (40806072,41176009)

摘　　要：The available data on tidal currents spanning periods greater than six months for the continental shelf of the East China Sea (26°30.052′N, 122°35.998′E) were analyzed using several methods. Tidal Current Harmonic Analysis results demonstrated that semi-diurnal tides dominated the current movement. The tidal currents of the principal diurnal and semidiurnal rotated clockwise with depth, with the deflection of the major semi-axes to the right in the upper layer and to the left in the lower layer. The vertical structures of two principal semi-diurnal constituents-M2 and S2-were similar, which indicates that the tidal currents are mainly barotropic in this area. The main features of the variation of the four principal tidal constituents with depth demonstrate that the currents in this region are influenced by the upper and lower boundary layers. Therefore, the tidal constituents of the shallow water are similar. Different vertical modes were calculated based on the Empirical Orthogonal Function (EOF) analysis of the Eastern and Northern components of the tidal currents, with a variance contribution for the zero-order model of at least 90%. The variance contribution of the baroclinic model is minimal, which further reveals a strong barotropic character for the tidal currents of this region.The available data on tidal currents spanning periods greater than six months for the continental shelf of the East China Sea （26°30.052′N, 122°35.998′E） were analyzed using several methods. Tidal Current Harmonic Analysis results demonstrated that semi-diurnal tides dominated the current movement. The tidal currents of the principal diurnal and semidiurnal rotated clockwise with depth, with the deflection of the major semi-axes to the right in the upper layer and to the left in the lower layer. The vertical structures of two principal semi-diurnal constituents-M2 and S2-were similar, which indicates that the tidal currents are mainly barotropic in this area. The main features of the variation of the four principal tidal constituents with depth demonstrate that the currents in this region are influenced by the upper and lower boundary layers. Therefore, the tidal constituents of the shallow water are similar. Different vertical modes were calculated based on the Empirical Orthogonal Function （EOF） analysis of the Eastern and Northern components of the tidal currents, with a variance contribution for the zero-order model of at least 90%. The variance contribution of the baroclinic model is minimal, which further reveals a strong barotropic character for the tidal currents of this region.

关 键 词：continental shelf of the East China Sea tidal current vertical mode barotropic tide 

分 类 号：P731.23[天文地球—海洋科学] P74