基于卫星高度计数据的南海水平搅拌分析

doi:10.11978/j.issn.1009-5470.2014.02.002

Abstract

Abstract: Stirring is an important part of mixing, which can be quantified using Finite Time Lyapunov Exponents (FTLE) based on Lagrangian view. In this paper, we calculated the FTLE of surface ocean derived from satellite altimeter from 2002 to 2011, and then analyzed spatial and temporal variation of horizontal stirring in the South China Sea (SCS). Results show that FTLE in the SCS is not uniform, with high values southeast of Vietnam indicating strong stirring, and low values in the northwest and southeast of the SCS. A slowly increasing trend of stirring in the SCS is observed during the 10 year period. FTLE also displays a seasonal fluctuation, strong in summer but weak in winter. Furthermore, we found that FTLE has a similar spatial distribution with Euler-based eddy kinetic energy (EKE) and strain rate, with high and low values of these three quantities locating roughly in the same areas. A comparison with Okubo-Weiss parameter reveals a strong relationship between vortices and FTLE ridges, referred to as Lagrangian Coherent Structures (LCS). Low values of FTLE are mainly present inside rotation-dominated vortices, while high values occur in strain-dominated regions surrounding the vortices.

Key words: Finite Time Lyapunov Exponents (FTLE), stirring, Lagrangian Coherent Structures (LCS), South China Sea

CLC Number:

P731

LI Wei-jie, ZHAN Hai-gang. Analysis of horizontal stirring in the South China Sea derived from satellite altimeter data[J].Journal of Tropical Oceanography, 2014, 33(2): 10-16.

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Analysis of horizontal stirring in the South China Sea derived from satellite altimeter data

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