龚延昆,陈学恩

• 1:中国海洋大学海洋与大气学院

摘要(Abstract)：

使用三维非静压环流模式MITgcm探究生成于吕宋海峡并向东沙岛传播的内孤立波。模式结果再现了东沙岛附近内孤立波的垂向振幅变化和到达时间。在不同纬向断面中,经向不对称的等密线起伏表现出内孤立波在南海的三维性特征。东沙岛附近的海表高度梯度变化表明,内孤立波在绕过东沙岛后,分离为2个短波峰线内波,此后两者相互作用。内孤立波在大陆坡浅化过程中相速逐渐减小,并与具有半日周期的理论线性相速度吻合一致。内孤立波与东沙岛碰撞后,在岛东北部会出现反射信号。本文利用斜压潮能通量,分析了反射能与入射之比在大潮期与小潮期的差异,发现小潮期的比值大于大潮期。选取东沙岛附近的3个站点,其垂向振幅表明A波与B波在大小潮转变时有不同的变化特征。在东沙岛西部和西北部的两个站位(WB和WN),A、B波均能被显著观测到;但在东沙岛南部站位(WS)只能观测到振幅具有正弦变化趋势的B波信号。

关键词(KeyWords)： 南海;内孤立波;东沙岛;MITgcm;数值模拟

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41276008);; 泰山学者计划项目资助~~

作者(Author): 龚延昆,陈学恩

DOI: 10.16441/j.cnki.hdxb.20160063

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