海洋模式的水平分辨率对吕宋海峡深层环流数值模拟结果的影响  

The Influence of Horizontal Resolution on the Numerical Simulation of Deep Water Circulation in Luzon Strait

作　　者：王斌[1] 赵玮[1] 

机构地区：[1]中国海洋大学物理海洋教育部重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2013年第4期1-8,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(91028008;41176010;40890153;41176008;40776005);国家高技术研究发展计划项目(2008AA09A402);教育部新世纪优秀人才支持计划项目(NCET-10-0764)资助

摘　　要：基于南海观测得到的垂向混合率修改KPP垂向混合方案,利用大洋环流模式HYCOM首次模拟得到了吕宋海峡深层环流的空间分布特征,并通过3个不同水平分辨率的实验(1/6(°)、1/12(°)、1/24(°))讨论水平分辨率对模拟吕宋海峡深层环流空间结构的影响。模拟结果表明:(1)1/6(°)水平分辨率过于粗糙,无法分辨巴士海峡和台东海峡地形特征,无法得到吕宋海峡深层环流的空间分布特征;(2)1/12(°)的水平分辨率可以很好的分辨吕宋海峡和台东海峡的地形特征,模拟得到吕宋海峡深层环流的空间分布和流场特征;(3)1/24(°)水平分辨率的模拟结果表明,更高的水平分辨率不会改变吕宋海峡深层环流的空间分布和主要出入口的垂向结构,只是会显示更细节的环流结构。1/12(°)和1/24(°)水平分辨率的模式结果都表明,西北太平洋深层水通过巴士海峡和台东海峡进入吕宋海沟,年平均流量分别为1.1和0.4Sv,然后沿吕宋海沟向南海方向流动,最后主要通过位于恒春海脊上的2个缺口进入南海,年平均流量分别为0.5和0.9Sv。In this paper,the general ocean model HYCOM with modified KPP vertical mixing algorithm according to observation was firstly used to simulate the Luzon Strait deep water circulation.And three different horizontal resolutions（1/6（°）,1/12（°）,1/24（°）） are configured to check how the deep water circulation responses to them.The results show that the 1/6（°） horizontal resolution is too coarse to depict the complex topography of Bashi and Taltung Strait,the Luzon Strait is closed below 2000m and therefore no deep circulation is driven in Luzon Strait.The 1/12（°） horizontal resolution could distinguish Bashi and Taltung Strait along Lan-yu Ridge,the much more finer topography helps to simulate the Luzon Strait deep water circulation well.The results of experiment with the highest horizontal resolution（1/24（°）） are familiar with that of experiment with 1/12 horizontal resolution,there is no obvious differences between them but the more detailed horizontal structure.The simulated results of these two experiments clearly show the existence of a deep water overflow and its detailed pathway in the Luzon Strait.Model simulation suggests the deep Pacific water flows into Luzon Trough through the Bashi Channel（1.1×106 m3 ·s-1） and the Taitung Canyon（about 0.4×106 m3·s-1）,and finally enters the South China Sea mainly through two gaps on the Heng-Chun Ridge,which the annual mean transports are 0.5×106 and 0.9×106 m3·s-1,respectively.

关 键 词：吕宋海峡 深层环流 水平分辨率 

分 类 号：P731.21[天文地球—海洋科学]