| Wang Yang,Li Cheng,Liu Qingyu. 2020. Observation of an anti-cyclonic mesoscale eddy in the subtropical northwestern Pacific Ocean from altimetry and Argo profiling floats. Acta Oceanologica Sinica, 39(7):79－90 |
| Observation of an anti-cyclonic mesoscale eddy in the subtropical northwestern Pacific Ocean from altimetry and Argo profiling floats |
| 基于卫星和浮标数据的副热带西北太平洋反气旋型中尺度涡旋的个例观测研究 |
| Received:September 25, 2019 |
| DOI：10.1007/s13131-020-1596-y |
| Key words:mesoscale eddy three-dimensional structure volume transport available heat and salt content anomaly energy analysis |
| 中文关键词: 中尺度涡旋 体积输运 三维结构 有效热盐含量异常 能量分析 |
| 基金项目:The National Program on Global Change and Air-Sea Interaction under contract No. GASI-IPOVAI-01-02; the program for scientific research start-up funds of Guangdong Ocean University under contract No. R19011; the fund of Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang) under contract No. ZJW-2019-08. |
| Author Name | Affiliation | E-mail | | Wang Yang | School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
Maritime Environment Construction Office, Beijing 100081, China | | | Li Cheng | Guangdong Key Laboratory of Coastal Ocean Variability and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
Marine Resources Big Data Center of South China Sea, Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524025, China | xiaoxianglch@163.com | | Liu Qingyu | School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China | |
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| Abstract: |
| The comprehensive three-dimensional structures of an anti-cyclonic mesoscale eddy (AE) in the subtropical northwestern Pacific Ocean were investigated by combining the Argo floats profiles with enhanced vertical and temporal sampling and satellite altimetry data. The AE originated near the Kuroshio Extension and then propagated westward with mean velocity of 8.9 cm/s. Significant changes and evolutions during the AE’s growing stage (T1) and further growing stage (T2) were revealed through composite analysis. In the composite eddy core, maximum temperature (T) and salinity (S) anomalies were of 1.7 (1.9)℃ and 0.04 (0.07) psu in T1 (T2) period, respectively. The composite T anomalies showed positive in almost whole depth, but the S anomalies exhibited a sandwich-like pattern. The eddy’s intensification and its influence on the intermediate ocean became more significant during its growth. The trapping depth increased from 400×104 Pa to 580×104 Pa while it was growing up, which means more water volume, heat and salt content in deeper layers can be transported. The AE was strongly nonlinear in upper oceans and can yield a typical mean volume transport of 0.17×106 m3/s and a mean heat and salt transport anomaly of 3.6×1011 W and –2.1×103 kg/s during the observation period. The Energy analysis showed that eddy potential and kinetic energy increased notably as it propagated westward and the baroclinic instability is the major energy source of the eddy growth. The variation of the remained Argo float trapped within the eddy indicated significant water advection during the eddy’s propagation. |
| 中文摘要: |
| 基于高分辨率的Argo浮标资料和卫星资料对副热带西北太平洋反气旋型中尺度涡旋进行了系统的三维结构研究。该涡旋发源于黑潮延伸体附近并以8.9cm/s的速度向西传播。通过合成分析表明，在成长阶段T1和成熟阶段T2中涡旋自身发生了显著的变化。在T1 (T2) 阶段，合成的涡旋中心处的最大温度和盐度异常分别为1.7 (1.9) ℃和0.04 (0.07) psu。合成的温度异常在整个深度为正值, 合成的盐度异常则呈现出一个三明治结构。在涡旋的成长过程中，其对中层海洋的影响变得更加显著。涡旋的迁移深度从400m加深到580m，这就意味着有更多的水体和热盐在更深的层次可以被涡旋输运。涡旋在上层非线性很强，可以造成0.17 Sv的体积输运以及3.6×1011 W、-2.1×103 kg s-1的热盐异常输运。能量收支分析表明涡旋的势能和动能在涡旋向西传播的过程中显著增加，并且斜压不稳定作用是涡旋成长的主要能量来源。涡旋传播过程中被输运的Argo浮标个数的变化表明涡旋的迁移过程中存在显著的水体对流交换过程。 |
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