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首页> 外文期刊>Journal of Physical Oceanography >Characteristics of the Near-Surface Currents in the Indian Ocean as Deduced from Satellite-Tracked Surface Drifters. Part I: Pseudo-Eulerian Statistics
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Characteristics of the Near-Surface Currents in the Indian Ocean as Deduced from Satellite-Tracked Surface Drifters. Part I: Pseudo-Eulerian Statistics

机译：卫星跟踪的地面漂移物推导的印度洋近地表水流特征。第一部分：伪欧拉统计

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摘要

Using the 1985-2013 record of near-surface currents from satellite-tracked drifters, the pseudo-Eulerian statistics of the near-surface circulation in the Indian Ocean (IO) are analyzed. It is found that the distributions of the current velocities and mean kinetic energy (MKE) in the IO are extremely inhomogeneous in space and nonstationary in time. The most energetic regions with climatologic mean velocity over 50 cm s(-1) and MKE over 500 cm(2) s(-2) are found off the eastern coast of Somalia (with maxima of over 100cm s(-1) and 1500 cm(2) s(-2)) and the equatorial IO, associated with the strong, annually reversing Somalia Current and the twice-a-year eastward equatorial jets. High eddy kinetic energy (EKE) is found in regions of the equatorial IO, western boundary currents, and Agulhas Return Current, with a maximum of over 3000 cm(2) s(-2) off the eastern coast of Somalia. The lowest EKE (< 500cm(2) s(-2)) occurs in the south subtropical gyre between 308 and 40 degrees S and the central-eastern Arabian Sea. Annual and semiannual variability is a significant fraction of the total EKE off the eastern coast of Somalia and in the central-eastern equatorial IO. In general, both the MKE and EKE estimated in the present study are qualitatively in agreement with, but quantitatively larger than, estimates from previous studies. These pseudo-Eulerian MKE and EKE fields, based on the most extensive drifter dataset to date, are the most precise in situ estimates to date and can be used to validate satellite and numerical results.
机译：利用1985年至2013年由卫星跟踪的漂移器产生的近地表水流记录，分析了印度洋（IO）近地表环流的伪欧拉统计量。发现IO中的当前速度和平均动能（MKE）的分布在空间上非常不均匀，并且在时间上不稳定。在索马里东部沿海地区发现了气候最活跃的地区，气候平均速度超过50 cm s（-1），MKE超过500 cm（2）s（-2）（最大值超过100cm s（-1）和1500 cm（2）s（-2））和赤道IO，与强劲的，每年反向的索马里洋流和每年两次的赤道东喷有关。在赤道IO，西部边界流和Agulhas回水区中发现了高涡动能（EKE），距索马里东海岸最大距离超过3000 cm（2）s（-2）。最低的EKE（<500cm（2）s（-2））发生在南亚热带回旋区（介于308和40度之间）和阿拉伯中央中部海域。年度和半年度变化是索马里东部沿海和赤道中东部IOE总量的很大一部分。一般而言，本研究中估计的MKE和EKE在质量上均与以前研究的估计相符，但在数量上要大于先前的研究。这些伪欧拉式MKE和EKE字段基于迄今为止最广泛的漂移数据集，是迄今为止最精确的原位估计，可用于验证卫星和数值结果。

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  • 来源
    《Journal of Physical Oceanography》 |2015年第2期|441-458|共18页
  • 作者

    Peng Shiqiu; Qian Yu-Kun; Lumpkin Rick; Du Yan; Wang Dongxiao; Li Ping;

  • 作者单位

    Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China;

    Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China;

    NOAA, Atlantic Oceanog & Meteorol Lab, Miami, FL 33149 USA;

    Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China;

    Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China;

    Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China;

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