冬季舟山外海定点实测海流资料分析  

Analysis of the mooring current data near Zhoushan Islands

作　　者：费岳军[1] 史军强[2] 堵盘军[1] 陈学恩[2] 

机构地区：[1]国家海洋局东海预报中心,上海100017 [2]中国海洋大学海洋环境学院,山东青岛266100

出　　处：《海洋通报》2013年第6期648-656,共9页Marine Science Bulletin

基　　金：海洋公益性行业科研专项(201205032-4)

摘　　要：利用2009年12月6日至2010年1月5日在舟山海域获取的东海海域海床基定点(122.998°E,30.013°N)海流调查资料,应用调和分析与低通滤波方法,将海流分解为周期性的潮流分量与余流分量。对潮流的分布特征进行了分析,并构建了一个更加符合物理规律的局地坐标系,基于此坐标系着重分析了该海域余流的时间变化趋势和空间结构特征。分析结果表明,该站位垂向各层的潮流类型均为正规半日潮流,M2、S2分潮潮流椭圆长轴基本上呈南-北走向,各层表现出一定的旋转流特点,往复流特征并不显著。K1、O1分潮潮流椭圆主轴基本呈西北-东南走向,往复流特征显著。该站点的定常余流表现出明显的"上进下出"垂向空间结构。上层流速方向与中下层基本反向,明显呈现出两个不同流系的特征。统计结果显示,余流主轴呈西南-东北走向,大致与等深线走向一致。对逐时余流分析表明,该站点近表层余流以西南向为主,中下层水域则以东北向流动为主,应处于浙闽沿岸流与台湾暖流的交汇地带,西南向余流与浙闽沿岸流对应,而东北向余流则与台湾暖流对应。风对沿主轴方向余流的影响比垂直于主轴的余流显著。Based on the current observations at a mooring station （122.998°E, 30.013°N） near the Zhoushan Islands from December 6, 2009 to January 5, 2010 and using the methods of Tide Current Harmonic and Low Pass Filter, this paper decomposed the current into cyclical trend component and residual current component and constructed a new local coordinate system with the laws of physics. The residual current component and its structure characteristics were analyzed. The results showed that regular semidiurnal tide dominated the current movement at every layer. The steady residual current displayed significant character of ＇ double track＇ with opposite direction between upper and lower- middle layer, which obviously presented the characteristics of two different streams. Statistics showed that the spindle of residual current with a southwest-northeast direction was roughly consistent with the trend of the isobath. Results of hourly steady residual current showed that the station should locate in the sea area connecting with Zhemin coastal water and TWC. Wind significantly affected the residual current along the isobath more obviously than the vertical direction.

关 键 词：舟山海域 浮标 海流 余流 

分 类 号：P731.21[天文地球—海洋科学]