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物理海洋实验室在中尺度涡领域取得重大进展
访问:2848  日期:2016-04-14 作者:

POL makes significant progress in mesoscale eddy research

414日,国际著名期刊Scientific Reports发表了题为“Observed 3D Structure, Generation, and Dissipation of Oceanic Mesoscale Eddies in the South China Sea”(《南海中尺度涡的三维结构与生消机制》)的最新研究成果。该成果由物理海洋教育部重点实验室田纪伟教授为通讯作者,实验室在读博士生张志伟为第一作者,实验室赵玮教授、吴德星教授和万修全副教授为合著者的科研团队共同完成。

On April 14th 2016, the journal Scientific Reports published the article entitled “Observed 3D Structure, Generation, and Dissipation of Oceanic Mesoscale Eddies in the South China Sea”, which are authored and coauthored by Dr. ZHANG Zhiwei (first author), Prof. TIAN Jiwei (corresponding author), QIU Bo, ZHAO Wei, CHANG Ping, WU Dexing and WAN Xiuquan of POL.  Dr. ZHANG Zhiwei is a PHD candidate student of POL.  

中尺度涡是海洋里的天气尺度动力过程,在大洋物质输运和能量串级中扮演着重要角色。然而,由于缺乏针对性的现场观测,目前人们对中尺度涡三维结构和消亡机制的认识尚不清晰。为探究这一科学问题,以田纪伟教授为首席科学家的973项目南海关键岛屿周边多尺度海洋动力过程研究,于2013/2014年在南海北部首次开展了国际上规模最大的中尺度涡综合现场观测实验—S-MEESouth China Sea Mesoscale Eddy Experiment,实验包括由17套潜标构成的中尺度涡观测网和甚高分辨率穿越中尺度涡的走航断面综合观测)。基于S-MEE实验获取的现场数据,研究团队首次揭示了南海中尺度涡的全水深三维结构和消亡机制。研究发现,南海中尺度涡能够从海表一直延伸到水深三千多米的海底,且由于陆坡地形的牵引作用,其三维结构在垂向上呈现出显著的倾斜。研究表明,中尺度涡在消亡过程中将大部分能量传递给了亚中尺度过程,而垂向混合和底摩擦对其能量的耗散作用相对较弱,即表明将能量正级串给亚中尺度过程”构成中尺度涡的主要消亡机制(图1)。

  1. 中尺度涡三维结构与消亡过程示意图

Figure 1. Schematic diagram of eddy's 3D structure and dissipation mechanism.

 

该研究首次发现了在地形“Beta效应作用下边缘海中尺度涡呈现出独特的倾斜结构,同时为解释中尺度涡如何消亡科学难题开辟了一条重要途径。论文第一作者张志伟是物理海洋实验室自主培养的博士研究生,充分展现了实验室人才培养质量的提升,并凸显了实验室在中尺涡研究领域的国际前沿地位。

 

 

About the article

Title: Observed 3D Structure, Generation, and Dissipation of Oceanic Mesoscale Eddies in the South China Sea

Authors: ZHANG Zhiwei, Jiwei Tian, Bo Qiu, Wei Zhao, Ping Chang, Dexing Wu, Xiuquan Wan

Journal: Scientific Reports, 6, 24349, doi: 10.1038/srep24349 (2016).  

Abstract:Oceanic mesoscale eddies with horizontal scales of 50–300 km are the most energetic form of flows in the ocean. They are the oceanic analogues of atmospheric storms and are effective transporters of heat, nutrients, dissolved carbon, and other biochemical materials in the ocean. Although oceanic eddies have been ubiquitously observed in the world oceans since 1960s, our understanding of their three-dimensional (3D) structure, generation, and dissipation remains fragmentary due to lack of systematic full water-depth measurements. To bridge this knowledge gap, we designed and conducted a multi-months field campaign, called the South China Sea Mesoscale Eddy Experiment (S-MEE), in the northern South China Sea in 2013/2014. The S-MEE for the first time captured full-depth 3D structures of an anticyclonic and cyclonic eddy pair, which are characterized by a distinct vertical tilt of their axes. By observing the eddy evolution at an upstream versus downstream location and conducting an eddy energy budget analysis, the authors further proposed that generation of submesoscale motions most likely constitutes the dominant dissipation mechanism for the observed eddies.

 

 

 

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