海底地形对南海海流、海面高度和海温影响的数值试验

NUMERICAL EXPERIMENTS OF EFFECTS OF OCEAN BOTTOM TOPOGRAPHY ON OCEAN CURRENTS, SEA SURFACE HEIGHTS AND TEMPERATURES IN THE SOUTH CHINA SEA

关键词:  海洋环流  海面自由高度  海温  数值模拟  海底地形

Key words:  Ocean currents  Free sea surface height  Sea temperature  Numerical modeling  Ocean bottom topography

摘要:

利用美国普林斯顿入学海洋模式(POM)的南海版本(SCS-POM),研究了南海海底地形对南海海流、海面高度和海温的影响。共做了4个数值试验,分别包含陡峭(STP)、光滑(SMT)、平坦(PLT)和中间(MDT)4种地形。在真实的海岸线和1月气候个均风应力的共同强迫下,将模式积分360天,对所得结果进行了比较分析。结果表明,海底地形对海水质量输送和海温分布有重要的影响,对表层和次表层流以及海面自由高度的影响较小,它们的分布主要由海岸线和风应力次定。并对海气耦合模式中海洋模式的选择提出了看法。

Abstract:

The South China Sea version(SCS-POM) of the U.S. Princeton University Ocean Model(POM) is used to simulate the effects of the bottom topography of the South China Sea(SCS)on currents, sea surface heights and temperatures in this paper. Four numerical experiments are conducted by use of steep(STP), Smooth(SMT), plain(PLT) and mediate(MDT) bottom topography respectively, in the model. With the real coast lines and the January wind stress forcing, the model is time integrated up to 360 days and the results are comparatively analyzed.It is found that important influences of the bottom topography exist on the water mass trans-portation and the temperature, while less importance appears in the effects on the surface and the shallow-layer currents, and on the free sea surface height as well. They are mainly deter-mined by the joint effect of the coast line and the wind stress. Some opinions on how to select the ocean model in an ocean-atmosphere coupled model are put forward in this paper, too.