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首页> 外文期刊>Ocean Dynamics >Role of fronts in the formation of Arabian Sea barrier layers during summer monsoon
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Role of fronts in the formation of Arabian Sea barrier layers during summer monsoon

机译：夏季季风期间锋线在阿拉伯海屏障层形成中的作用

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摘要

The barrier layer (BL) - a salinity stratification embedded in the upper warm layer - is a common feature of the tropical oceans. In the northern Indian Ocean, it has the potential to significantly alter the air-sea interactions. In the present paper, we investigate the spatio-temporal structure of BL in the Arabian Sea during summer monsoon. This season is indeed a key component of the Asian climate. Based on a comprehensive dataset of Conductivity-Temperature-Depth (CTD) and Argo in situ hydrographic profiles, we find that a BL exists in the central Arabian Sea during summer. However, it is highly heterogeneous in space, and intermittent, with scales of about ～ 100 km or less and a couple of weeks. The BL patterns appear to be closely associated to the salinity front separating two water masses (Arabian Sea High Salinity Water in the Northern and Eastern part of the basin, fresher Bay of Bengal Water to the south and to the west). An ocean general circulation model is used to infer the formation mechanism of the BL. It appears that thick (more than 40 m) BL patterns are formed at the salinity front by subduction of the saltier water mass under the fresher one in an area of relatively uniform temperature. Those thick BL events, with variable position and timing, result in a broader envelope of thinner BL in climatological conditions. However, the individual patterns of BL are probably too much short-lived to significantly affect the monsoonal air-sea interactions.
机译：屏障层（BL）是嵌入在上部暖层中的盐度分层，是热带海洋的共同特征。在印度洋北部，它有可能显着改变海-气相互作用。在本文中，我们研究了夏季风期间阿拉伯海BL的时空结构。这个季节确实是亚洲气候的关键组成部分。基于电导率-温度-深度（CTD）和Argo原位水文剖面的综合数据集，我们发现夏季期间在阿拉伯海中部存在BL。然而，它在空间上是高度异质的，并且是间歇性的，规模约为〜100 km或更小，长达数周。 BL模式似乎与将两个水团分开的盐度前沿密切相关（盆地北部和东部的阿拉伯海高盐度水，南部和西部较新鲜的孟加拉湾水）。海洋大环流模型被用来推断BL的形成机理。似乎是通过在温度相对均匀的区域中，较新鲜的咸水团在较新的咸水团的俯冲作用下，在盐度前沿形成了厚（超过40 m）的BL模式。那些厚厚的BL事件，具有可变的位置和时间，导致在气候条件下更薄的BL的包络范围更大。但是，BL的单个模式可能寿命太短，以至于无法显着影响季风气-海相互作用。

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  • 来源
    《Ocean Dynamics》 |2014年第6期|809-822|共14页
  • 作者

    Clement de Boyer Montegut; Fabien Durand; Romain Bourdalle-Badie; Bruno Blanke;

  • 作者单位

    IFREMER, Centre de Brest, Laboratoire d'Oceanographie Spatiale, Pointe du Diable, B.P. 70, 29280 Plouzane, France;

    IRD, LEGOS, UMR5566 CNRS-CNES-IRD-UPS, 14 Avenue Edouard Belin, 31400 Toulouse, France;

    Mercator Ocean, 8-10 rue Hermes, Parc Technologique du Canal,31520 Ramonville Saint-Agne, France;

    Laboratoire de Physique des Oceans, UMR 6523 CNRS-IFREMER-IRD-UBO, CNRS, Brest, France;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Barrier layer; Arabian Sea; Summer monsoon; ARGO; ASHSW;

    机译：阻挡层;阿拉伯海;夏季风ARGO;ASHSW;

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