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首页> 外文期刊>International journal of remote sensing >The influence of meso-scale eddies on the current field and thermal structure of the southeastern Arabian Sea
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The influence of meso-scale eddies on the current field and thermal structure of the southeastern Arabian Sea

机译：中尺度涡旋对阿拉伯东南海流场和热力结构的影响

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摘要

Satellite altimetry in combination with ground-truth measurements and the Okubo-Weiss parameter-based eddy-tracking algorithm are used to study eddies in the southeastern Arabian Sea (SEAS) during the summer and winter of 2007 and 2008. In the SEAS, only the cyclonic eddy is present in summer whereas both cyclones and anticyclones are present in winter. These eddies, with dimensions of 60-120 km, propagate westward with slight north-south deflection at a speed of 5-23 cm s~(-1) (mean 11.8 cm s~(-1)). The lifespan of eddies varies from two to six weeks. Exceptions are a cyclonic eddy in 2007 and an anticyclonic eddy in 2008 that persisted for 6 and 11 weeks, respectively. During summer and the early half of winter, wind-stress curl plays a significant role in the genesis of eddies in the SEAS. However, the propagation of these eddies is not influenced by wind-stress curl. Observations reveal that the thermal structure and currents are modified by these eddies. In winter, the signature of the cyclonic eddy is not prominent on the surface, as the water column is homogeneous up to 100 m. In the summer monsoon season, the signature of the eddy is evident up to the surface. During this period, the southward West India Coastal Current is modified locally by the cyclonic eddy formed in the SEAS.
机译：卫星测高技术结合地面实测数据和基于Okubo-Weiss参数的涡流跟踪算法，用于研究2007年和2008年夏季和冬季在阿拉伯东南海（SEAS）的涡流。夏季存在旋风涡旋，而冬季存在旋风和反旋风。这些涡旋的大小为60-120 km，以5-23 cm s〜（-1）（平均11.8 cm s〜（-1））的速度向西传播，并有轻微的南北偏斜。涡流的寿命从两周到六周不等。 2007年的旋风涡和2008年的反旋风涡分别持续了6周和11周，这是个例外。在夏季和冬季的上半年，风应力卷曲在SEAS涡流的产生中起着重要作用。但是，这些涡流的传播不受风应力卷曲的影响。观察结果表明，这些涡流会改变热结构和电流。在冬季，旋风涡流的特征在地表上不明显，因为水柱在100 m之前都是均匀的。在夏季季风季节，涡旋的特征在表面上是明显的。在此期间，南亚西印度洋海流通过SEAS中形成的旋风涡旋在当地进行了修改。

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  • 来源
    《International journal of remote sensing》 |2014年第14期|5479-5496|共18页
  • 作者

    T.N. Shyni; P.V. Hareesh Kumar;

  • 作者单位

    Naval Physical & Oceanographic Laboratory, Kochi 68202, India;

    Naval Physical & Oceanographic Laboratory, Kochi 68202, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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