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Extracting Lagrangian coherent structures in the Kuroshio current system

机译：提取Kuroshio电流系统中的拉格朗日相干结构

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摘要

In this paper, we propose to extract Lagrangian coherent structures (LCSs) based on MADT data to describe the structure of the Kuroshio Current System, and this method helps study the monthly variation in the intensity. By exploiting the improved variational principles, we extract LCSs through a geostrophic velocity vector field derived from the absolute dynamic topography. Specifically, we address hyperbolic LCSs and parabolic LCSs, with the former as the outer bounds of the jet flow and the latter as a more robust depiction of the jet axis. These LCSs delineate the jet with theoretical underpinnings, as opposed to common contours identified in an anecdotal manner. We employ the top 20% most repelling and attracting hyperbolic LCSs to approximate the outer bounds of the Kuroshio Current System, and these structures are apt to enclose the jet. Compared with the results of FTLEs and FSLEs, our results are more reliable. A comparison in the intensity based on the jet axis of months in 2012 demonstrates the effectiveness of our method in extracting LCSs. In situ data, such as drifter tracks and temperature-salinity profiles, are applied to validate the reliability of the axis and outer bounds extracted from the Kuroshio.
机译：在本文中，我们建议基于MADT数据提取拉格朗日相干结构（LCSS）来描述Kuroshio电流系统的结构，并且该方法有助于研究强度的月度变化。通过利用改进的变分原理，我们通过从绝对动态地形导出的地球节速度矢量场提取LCS。具体地，我们地址地址双曲线LCS和抛物线LCSS，前者作为喷射流的外界，并且后者作为喷射轴的更鲁棒描绘。这些LCSS与理论内衬界定射流，而不是以轶事方式确定的常见轮廓。我们采用前20％最低20％的排斥和吸引双曲线LCS，以近似Kuroshio电流系统的外界，并且这些结构易于包围射流。与FTLES和FSLE的结果相比，我们的结果更可靠。基于2012年的射流轴的强度的比较展示了我们在提取LCSS中的方法的有效性。在原位数据（例如漂移轨道和温度 - 盐度轮廓）施加以验证从Kuroshio提取的轴和外界的可靠性。

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  • 来源
    《Ocean Dynamics》 |2019年第6期|641-656|共16页
  • 作者

    Tian Fenglin; He Qiu; Liu ZhanPing; Chen Ge;

  • 作者单位

    Ocean Univ China Coll Informat Sci & Engn Dept Marine Technol Qingdao Shandong Peoples R China|Qingdao Natl Lab Marine Sci & Technol Lab Reg Oceanog & Numer Modeling Qingdao Shandong Peoples R China;

    Ocean Univ China Coll Informat Sci & Engn Dept Marine Technol Qingdao Shandong Peoples R China|Qingdao Natl Lab Marine Sci & Technol Lab Reg Oceanog & Numer Modeling Qingdao Shandong Peoples R China;

    Old Dominion Univ Dept Modeling Simulat & Visualizat Engn Norfolk VA 23529 USA;

    Ocean Univ China Coll Informat Sci & Engn Dept Marine Technol Qingdao Shandong Peoples R China|Qingdao Natl Lab Marine Sci & Technol Lab Reg Oceanog & Numer Modeling Qingdao Shandong Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Lagrangian coherent structures; Kuroshio current system; Jet axis; Outer bound; Material transport;

    机译：拉格朗日相干结构;金子轴电流系统;喷射轴;外界;物质运输;

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