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OALib Journal期刊
ISSN: 2333-9721
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基于卫星高度计数据的南海水平搅拌分析
Keywords: 有限时间李亚普诺夫指数,搅拌,拉格朗日拟序结构,南海
Abstract:
？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(finitetimelyapunovexponents,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(lagrangiancoherentstructures,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。
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