| 摘要: |
| 本文基于归一化合成分析的方法，利用卫星高度计资料和CTD观测资料，在满足静力平衡和地转平衡条件的假设下研究了南海中尺度涡的三维结构，给出了南海中尺度涡归一化之后的三维结构，并与全球大洋中尺度涡统一的三维结构进行对比。结果显示，在1.5倍涡旋半径以外，南海中尺度涡水平结构的收敛速度大约为全球大洋中尺度涡水平结构收敛速度的2.5倍，前者比后者的影响范围要小约1.5倍涡旋半径。由于数据原因，我们仅合成了南海0至800m水深中尺度涡的垂直结构，从垂直结构的合成结果来看，由于受到背景层结和科氏参数的影响，南海与全球大洋各海区中尺度涡的垂直结构具有明显的不同，随着深度的增加，南海中尺度涡垂直结构的衰减速度明显更快。 |
| 关键词: 南海 中尺度涡 三维结构 归一化 合成分析 |
| DOI：10.11693/hyhz20170300042 |
| 分类号:P722.7 |
| 基金项目:科技部重点研发计划项目，2016YFA0601803号；国家自然科学基金项目，41490641号，U1406401号。 |
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| ON UNIVERSAL 3D STRUCTURE OF MESOSCALE EDDIES IN UPPER LAYER OF SOUTH CHINA SEA |
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ZHENG Kun1,2, LIN Xiao-Pei1,2, ZHU Ya-Nan1,2
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1.Key Laboratory of Physical Oceanography, Ministry of Education, Ocean University of China, Qingdao 266100, China;2.College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
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| Abstract: |
| Under the assumption of geostrophic balance and hydrostatic balance,we investigated the spatial structure of the mesoscale eddies in the South China Sea (SCS) and used normalized composite analysis of satellite altimetry and CTD data. Compared with the universal structure of mesoscale eddies in the globe oceans, the horizontal structure of mesoscale eddies in SCS converge 2.5 times faster than those in 1.5 radius outside. The measurement and calculation show, the influence range of eddies in SCS is about 2 radius smaller than those in the globe oceans. Due to lack of deep level data, we could composite the vertical structure of mesoscale eddies in 0-800m only in SCS. Because of the background stratification and the Coriolis force, the vertical structure is much more different from those in the globe oceans. With the increase of depth, the vertical structure attenuates much more rapidly in SCS. |
| Key words: South China Sea mesoscale eddies three-dimensional structure normalization composite analysis |
