南海北部某海洋工程海域的内潮特征研究

Study on Characteristics of Internal Tide in an Ocean Engineering Area of the Northern South China Sea

利用南海北部某海洋工程所在海域一套潜标系统获取的连续6个月的温盐流数据,分析研究了该海域的内潮特征,发现该海域的内潮波振幅不超过20m。在垂直方向上,中上层内潮波更明显,且主要为较强的全日内潮和较弱的半日内潮。斜压流以顺时针旋转的全日潮流为主,椭圆长轴主要呈南北走向,潮流椭圆先随深度增加而逐渐变小,在深度120~140m处达到最小,深度再往下增加又逐渐变大。同时,还发现该海域在213m以浅存在着明显的近惯性波动,其能量穿越温跃层下传。另外,在此海域还证实了东沙海流的存在,其平均流速14.3cm/s,平均流向237.6°。

Characteristics of internal tide were analyzed based on the data recorded by a submerged buoy system in an ocean engineering area of the northern South China Sea during April to October,2012.It was found that the maximum amplitude of the internal tide was less than 20 m around the area.In vertical,the internal tide was more obvious in upper middle layers,and their major part was strong diurnal internal tide and weak semidiurnal internal tide.Major baroclinic currents were clockwise diurnal tidal current,and the elliptic major axis was north-south mainly.The tidal current ellipses were decreased gradually with the depth increasing firstly,and reached the minimum around 120-140 m,then increased gradually with the depth increasing.In addition,Dongsha Current was proved in this sea field,which average velocity was 14.3 cm/s,and average direction was 237.6°.