摘要
在全球的海洋中,中国东海和临近海域是最显著的内潮生成地之一。本文采用NODC(Levitus) World Ocean Atlas 1998提供的季平均温、盐资料,计算海水的密度,并计算垂向密度梯度的最大值点,得到一个较符合海水实际的密度分层。使用三维非线性数值模型(将海洋分为2层)研究了潮汐(M2,S2,K1,O1分潮)作用下渤黄东海的内潮,揭示了整个海区内潮起伏的空间分布,结果发现大振幅的波动均发生在台湾东北(冲绳海槽)海域和中国近海地形突变之处,其中前者更显著。对于各分潮模拟得到的表面潮与TOPEX/Poseidon高度计资料基本一致。研究结果表明上层海水的深度和厚度的梯度对内潮有一定的影响;冬季分布区域比夏季小,强度比夏季大。
The East China Sea and adjacent seas are one of the most significant generation regions of the internal tide in the world＇s oceans. In the present study, we use the data of seasonal average temperature and salinity from NODC （Levitus） World Ocean Atlas 1998, to compute the density of the seawater and the point of the density＇s maximal gradients. We obtain an interface which agrees well with the realistic sea＇s layer. We investigate the distribution of the internal tides（M2 ,S2 ,K1 ,O1 ）in the Bohai Sea, the Yellow Sea and the East China Sea by using a three-dimensional numerical model. The numerical experiments show that internal tides are effectively generated over prominent topographic features such as the north -east of Taiwan （the Okinawa Trough） and the continental shelf slope in the China seas, particularly the former. The surface manifestation of the internal tides in the model is in good agreement with the TOPEX/Poseidon altimeter observations. It is found that the depth of the upper layer seawater and the gradients of the depth affect the internal tide： the regional distribution is small in winter than that in summer, and its intensity is stronger in winter than in summer.
出处
《海洋湖沼通报》
CSCD
北大核心
2007年第1期30-37,共8页
Transactions of Oceanology and Limnology
基金
物理海洋教育部重点实验室开放课题基金资助(No.200307)
国家重点基础研究发展计划项目(No.2005CB422308)
高等学校博士学科点专项科研基金资助(No.20050423007)
关键词
内潮
数值模拟
渤黄东海
两层模式
internal tides
numerical simulation
the Bohai Sea
the Yellow Sea
the East China Sea
two-layer model
