蒙特利湾底层潮流特征分析  

The Underlying Currents Characteristics of Monterey Bay

作　　者：吴俊杉[1] 刘子洲 刘聪[1] 李培良[1] 

机构地区：[1]中国海洋大学海洋环境学院,山东青岛266100

出　　处：《海洋湖沼通报》2014年第3期13-21,共9页Transactions of Oceanology and Limnology

基　　金：国家自然科学基金项目(41076005);国家高技术研究发展规划项目(2012AA09A403)资助

摘　　要：利用多种分析方法对2011年4月至2011年10月蒙特利湾的1个站点近半年的底层流速观测资料进行分析。潮流谱分析结果表明,半日潮流(M_2和S_2)和全日潮流(K_1和O_1)在该地区潮流中占主导地位。调和分析结果表明,潮流椭圆随深度旋转,且以顺时针旋转为主,潮流振幅存在显著的垂向变化。2个主要半日分潮M2和S2的垂直结构相似,表明该地区的主要潮流是正压的。4个主要分潮随深度变化的主要特征袁明这地区的潮流受下边界层的影响。基于EOF分解的东向和北向潮流的不同垂向模态中,零阶模态的方差贡献至少为85%,斜压模态的方差贡献很小,这进一步揭示了该地区的潮流有很强的正压性。Based on direct current measurements in the Monterey Bay from a subsurface mooring with an Acoustic Doppler Current Profiler during the period of April 2011 to October 2011,tidal characteristics were analyzed using several methods.Current spectra indicate that the semidiurnal（M2 and S2） and diurnal（K1 and O1） were the dominant constituents.Tidal Current Harmonic Analysis results demonstrate that the tidal currents of the principal semidiurnal rotate clockwise with depth.The vertical structures of two principal semidiurnal constituents（M2 and S2） were similar,which suggested the tidal currents were mainly barotropic in this area.The main features of the variation of the four principal tidal constituents with depth demonstrated that the currents in this region are influenced by the lower boundary layer.Different vertical modes are 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 mode of at least 85%.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：蒙特利湾 高频观测 底层潮流 

分 类 号：P731.21[天文地球—海洋科学]