冬季南海西边界急流的动力机制分析*

doi:10.11978/j.issn.1009-5470.2013.02.008

Abstract

Abstract:

The three-dimensional structure of western boundary current of the South China Sea (SCS) in winter is investigated with the unstructured grid, Finite-Volume Coastal Ocean Model (FVCOM) and the altimeter data. The dynamic mechanisms of the current are explored by the numerical experiment and the dynamical diagnose analysis. The modeling results and the altimeter data show that the western boundary current has greater velocity than nearby current, which comes from northern SCS and flows along the 200m isobath towards southwest. It's strengthened at the southeast of Hainan Island and forms the south rush flow. The horizontal and vertical structure of western boundary current is complicated and variable. Since the pressure gradient force is associated with the Coriolis force, the western boundary current is generally dominated by the geostrophic currents. On the other hand, the current has local characteristics because of the impact of the winds, topography and the nonlinear advection, etc. Among these factors, the pressure gradient force and winds have the most significant contributions on the formation and evolution of the western boundary current. The distribution of pressure gradient force is agreed with the three-dimensional structure of the current very well. The impact of winds on the current is related to the local topography and the coastline.

Key words: South China Sea (SCS), western boundary current, numerical experiment, dynamical mechanism

CLC Number:

P731

DONG Hui-chao，JING Zhi-you，QI Yi-quan，ZHOU Li-jia. Dynamic analysis on the winter current over western boundary of the South China Sea[J].Journal of Tropical Oceanography, 2013, 32(2): 74-81.

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Dynamic analysis on the winter current over western boundary of the South China Sea

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