楚科奇海夏季潮流和余流观测研究

Study of tide and residual current observations in Chukchi Sea in the summer 2008

根据2008年8月5日至9月7日在楚科奇海布放的一套锚碇潜标观测系统(71°40.024′N,167°58.910′W)获得的海流剖面资料研究了该海区的海流分布特征,重点探讨了潮流的垂向结构、余流剖面特征及海流的斜压性。结果表明:(1)该海域主要分潮为半日潮M1,S2和N2,近日分潮O1,天文分潮MM和MSF,其中以M2为代表的半日分潮最为显著,所有半日分潮的潮流椭圆均呈逆时针方向旋转;(2)整个测流剖面内平均余流呈东北偏北流向,平均余流大小为6.6cm/s;(3)各层余流存在显著的垂向同步的周期性变化;(4)在8～11m范围内平均斜压动能较强,而18m以下平均斜压动能较弱,在11～18m范围内由上而下平均斜压动能不断减弱,平均斜压余流逐渐变小。

Based on the Acoustic Doppler Current Profilers obtained from a shallow mooring deployed in the Central Channel of the Chukchi Sea（71°40.024′N,167°58.910′W） during 5 August to 7 September in the third Chinese Arctic Research Expedition 2008,the distribution of sea currents is studied,focusing on the trend of the vertical structure of currents,profile characteristics and baroclinicity.Main results incudes：（1） 6 significant tidal constituents predominate in this area,which are the semidiurnal tidal M1,S2 and N2,and the recent tidal O1,astronomical tidal MM and MSF,while the M2 semidiurnal tidal represents the most significant,the trend of all the half-day tidal ellipses shows counterclockwise Rotation;（2） The average measured current profile throughout the flow is north-northeast flow with the average residual current magnitude of 6.6 cm/s;（3） There is a significant vertically synchronous cyclical changes for the residual current in all layers;（4） In depth range of 8～11 m,the average baroclinic kinetic energy is stronger,while it is relatively weak below 18 m,in depth of 11～18 m the average kinetic energy of baroclinic decrease gradually from up to down,with the average baroclinic flow change to be smaller gradually.