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

热带海洋学报 ›› 2014, Vol. 33 ›› Issue (2): 10-16.doi: 10.11978/j.issn.1009-5470.2014.02.002cstr: 32234.14.j.issn.1009-5470.2014.02.002

所属专题：海洋大数据及应用

基于卫星高度计数据的南海水平搅拌分析

李玮洁^{1, 2}, 詹海刚¹

1. 热带海洋环境国家重点实验室(中国科学院南海海洋研究所), 广东广州 510301; 2. 中国科学院大学, 北京 100049;

收稿日期:2013-04-15 修回日期:2013-05-28 出版日期:2014-04-02 发布日期:2014-04-02
通讯作者: 詹海刚。E-mail: hgzhan@scsio.ac.cn
作者简介:李玮洁(1987~), 女, 重庆市人, 硕士研究生, 主要从事海洋遥感应用研究。E-mail: jayway25@sina.com

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

LI Wei-jie^{1, 2}, ZHAN Hai-gang¹

1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China;

Received:2013-04-15 Revised:2013-05-28 Online:2014-04-02 Published:2014-04-02
Contact: 国家自然科学基金项目(41176162)

摘要/Abstract

摘要： 搅拌是海水混合的重要组成, 其强度可由基于拉格朗日观点的有限时间李亚普诺夫指数(Finite Time Lyapunov Exponents, FTLE)定量计算。文章利用卫星高度计资料统计分析了2002~2011年间南海地转流场的FTLE时空变化特征。结果显示, FTLE在越南东南海域强度最大, 对应水平搅拌作用最强; 而在南海西北、东南区域其值偏低。近10年的南海水平搅拌呈缓慢增强趋势, 且存在明显的季节变化, 夏季较强而冬季偏弱。FTLE的空间分布与基于欧拉观点的涡动能和应变速率相似, 强搅拌的区域, 其涡动能和应变速率亦较高。与Okubo-Weiss参数的比较则显示, 构成流场拉格朗日拟序结构(Lagrangian Coherent Structures, LCS)的FTLE脊线与流场中涡旋联系紧密, FTLE低值集中在旋转主导的涡旋内部, 而高值多在涡旋周围应变主导区域。

关键词: 有限时间李亚普诺夫指数, 搅拌, 拉格朗日拟序结构, 南海

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

中图分类号:

P731

李玮洁, 詹海刚. 基于卫星高度计数据的南海水平搅拌分析[J]. 热带海洋学报, 2014, 33(2): 10-16.

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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基于卫星高度计数据的南海水平搅拌分析

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

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