西北太平洋副热带海区一个气旋涡的三维结构、运动学及其亚中尺度特征  

Three-dimensional structures,kinematics and submesoscale characteristics of a cyclonic eddy in the subtropical region of Northwestern Pacific

作　　者：方思敏 林宏阳 胡致远 孙振宇[1,2] 杨龙奇 胡建宇 FANG Simin;LIN Hongyang;HU Zhiyuan;SUN Zhenyu;YANG Longqi;HU Jianyu(State Key Laboratory of Marine Environmental Science,College of Ocean and Earth Sciences,Xiamen University,Xiamen 361102,China;Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai 519082,China)

机构地区：[1]厦门大学海洋与地球学院,近海海洋环境科学国家重点实验室,福建厦门361102 [2]南方海洋科学与工程广东省实验室,广东珠海519082

出　　处：《厦门大学学报（自然科学版）》2023年第3期425-434,共10页Journal of Xiamen University：Natural Science

基　　金：国家自然科学基金(41730533,91958203,42076013)。

摘　　要：利用厦门大学“嘉庚”号科考船于2019年3—4月在西北太平洋副热带逆流区收集的现场观测数据,结合卫星遥感资料与漂流浮标数据,分析该区域一个气旋涡(编号CE2)的三维结构、运动学及其亚中尺度特征.结果表明:1)CE2涡旋在表层约呈椭圆形,其影响范围随着深度的增大向北侧收缩,最大影响深度约400 m;2)热成风关系在CE2涡旋范围内存在显著的尺度依赖性;3)涡中心与边缘因亚中尺度过程活跃程度不同而呈现尺度依赖性动能和相反的动能波数谱特征;4)漂流浮标轨迹分析显示涡旋边缘存在明显的物质输运“泄漏”现象.上述结果对传统中尺度涡旋现象进行了基于实测资料的观测补充.From March to April in 2019,a research cruise targeted on observing mesoscale eddies was carried out onboard R/V TAN KAH KEE in the Subtropical Countercurrent area of the Northwestern Pacific.Using these in-situ measurements,together with satellite remote sensing and drifter trajectory data,this paper describes the three-dimensional structures,kinematics and submesoscale characteristics of a sampled cyclonic eddy(i.e.eddy CE2)in the studied regions.Main findings of this study are as follows:1)The shape of eddy CE2 is approximately oval at sea surface,and the eddy influencing area shrinks to the northern part of the eddy as the depth increases.The maximum influence depth of eddy CE2 is about 400 m.2)The validity of the thermal wind relationship exhibits a clear scale dependence.3)Due to the differences in the activity degree of submesoscale processes,the scale-dependent kinetic energy and its wavenumber spectra display contrasting features between the eddy core and eddy peripheries.4)Analysis of drifter trajectories showed significant material leakage from the inside of the eddy is observed during eddy propagation based on analysis of drifter trajectories.Based on the above measured data,the phenomena of mesosale eddies in the traditional theory are supplemented.

关 键 词：中尺度涡旋 西北太平洋副热带逆流 三维结构 亚中尺度特征 实测数据 

分 类 号：P717[天文地球—海洋科学]