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| 西北太平洋中尺度涡半径与涡动能的统计关系 |
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赵 军1,2,3, 高 山1,2,3,4, 王 凡1,2,3,4, 陈永利1,2
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1.中国科学院海洋研究所;2.中国科学院 海洋环流与波动重点实验室;3.中国科学院大学;4.青岛海洋科学与技术国家实验室 海洋动力过程与气候功能实验室
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| 摘要: |
| 中尺度涡的半径与涡动能之间的关系及其内在机制的研究, 对我们理解中尺度涡旋的三维结构特征及其变异规律有很大的帮助。本文利用AVISO卫星高度计融合数据, 基于流场几何特征的识别方法对西北太平洋(10°～52°N, 120°～180°E)的中尺度涡进行了识别追踪, 并由此分析了该区域内中尺度涡的半径与涡动能(Eddy Kinetic Energy, EKE)的统计关系。结果表明该区域中尺度涡的半径与EKE之间存在类似翻转高斯函数的递增关系, 特别是在涡旋半径达到一定程度后, EKE将不随半径的变大而继续增强。而且该关系与纬度密切相关, 相同半径条件下, 涡旋的EKE近似与其所在纬度的第一斜压Rossby变形半径的平方呈反比。进一步分析表明该统计关系与中尺度涡所处的发展阶段没有明显的联系。该结果为建立一个实用性的参数化、归一化的中尺度涡模型提供了一定的理论基础。 |
| 关键词: 西北太平洋 中尺度涡 涡动能 涡旋半径 AVISO |
| DOI：10.11759/hykx20180115001 |
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| 基金项目:中国科学院战略性先导科技专项(XDA11010102); 国家重点研发计划(2016YFC0301203); 国家自然科学基金项目(41676009);热带海洋环境国家重点实验室开放课题(LT01701) |
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| Statistical relationship between mesoscale eddy radius and eddy kinetic energy in the Northwestern Pacific |
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ZHAO Jun,GAO Shan,WANG Fan,CHEN Yong-li
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| Abstract: |
| The mesoscale eddies in the Northwestern Pacific (10°-52°N, 120°-180°E) were detected and tracked using AVISO satellite altimeter data based on the eddy detection scheme of velocity vector geometry. The statistical relationship between the mesoscale eddy radius (R) and the eddy kinetic energy (EKE) in this area were analyzed. The results showed that the relationship between the mesoscale eddy radius and EKE in this region is in the form of an inverted bell curve, especially when the eddy reaches a certain size (radius > 120 km), whereupon the EKE stops increasing with increasing radius. Moreover, the EKE-R relationship seems highly related to latitude: the EKE of eddies of similar radius seems to be inversely proportional to the square of the Rossby deformation radius of the first baroclinic at the eddies’ latitudes. Further analysis indicated that there is no significant correlation between the EKE-R relationship and the development periods of mesoscale eddies. |
| Key words: Northwestern Pacific mesoscale eddy eddy kinetic energy eddy radius AVISO |