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首页> 外文期刊>Journal of Physical Oceanography >Reduced Near-Surface Thermal Inversions in 2005-06 in the Southeastern Arabian Sea (Lakshadweep Sea)
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Reduced Near-Surface Thermal Inversions in 2005-06 in the Southeastern Arabian Sea (Lakshadweep Sea)

机译：2005-06年度，阿拉伯海东南部（拉克肖普海）近地表热反演减少

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摘要

Repeat XBT transects made at near-fortnightly intervals in the Lakshadweep Sea (southeastern Arabian Sea) and ocean data assimilation products are examined to describe the year-to-year variability in the observed near-surface thermal inversions during the winter seasons of 2002-06. Despite the existence of a large low-salinity water intrusion into the Lakshadweep Sea, there was an unusually lower number of near-surface thermal inversions during the winter 2005/06 compared to the other winters. The possible causative mechanisms are examined. During the summer monsoon of 2005 and the following winter season, unusually heavy rainfall occurred over the southwestern Bay of Bengal and the Lakshadweep Sea compared to other years in the study. Furthermore, during the winter of 2005, both the East India Coastal Current and the Winter Monsoon Current were stronger compared to the other years, transporting larger quantities of low salinity waters from the Bay of Bengal into the Lakshadweep Sea where a relatively cooler near-surface thermal regime persisted owing to prolonged upwelling until November 2005. In addition, the observed local surface wind field was relatively stronger, and the net surface heat gain to the ocean was weaker over the Lakshadweep Sea during the postmonsoon season of 2005. Thus, in winter 2005/06, the combination of prolonged upwelling and stronger surface wind field resulting in anomalous net surface heat loss caused weaker secondary warming of the near-surface waters in the Lakshadweep Sea. This led to a weaker horizontal sea surface temperature (SST) gradient between the Lakshadweep Sea and the intruding Bay of Bengal waters and, hence, a reduced number of thermal inversions compared to other winters despite the presence of stronger vertical haline stratification.
机译：在Lakshadweep海（东南阿拉伯海）中，每隔近两周重复一次XBT样线，并检查海洋数据同化产品，以描述2002-06冬季观测到的近地表热反演的逐年变化。 。尽管存在大量的低盐度水侵入Lakshadweep海，但与其他冬季相比，2005/06年冬季的近地表热反演数量异常少。研究了可能的原因机制。与本研究的其他年份相比，在2005年夏季风和随后的冬季，在孟加拉西南部的西南海湾和Lakshadweep海出现了异常大的降雨。此外，在2005年冬季，东印度洋沿岸洋流和冬季季风洋流都比往年更强，将大量的低盐度水从孟加拉湾输送到Lakshadweep海，该海的近地表温度相对较低由于长时间的上升流一直持续到2005年11月，热力状态仍然存在。此外，在2005年的季风季节期间，Lakshadweep海的观测到的当地地表风场相对较强，并且海洋的净地表净热量吸收较弱。因此，冬季2005/06年，上升时间延长和地表风场增强，导致净净地表热量损失异常，导致Lakshadweep海中近地表水的二次增温减弱。这导致Lakshadweep海与入侵的孟加拉水域之间的水平海表温度（SST）梯度变弱，因此尽管存在垂直海盐分层较强的现象，但与其他冬季相比，热反转的数量减少了。

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  • 来源
    《Journal of Physical Oceanography》 |2009年第5期|1184-1199|共16页
  • 作者

    K. Nisha; Suryachandra A. Rao; V. V. Gopalakrishna; R. R. Rao; M. S. Girishkumar; T. Pankajakshan; M. Ravichandran; S. Rajesh; K. Girish; Z. Johnson; M. Anuradha; S. S. M. Gavaskar; V. Suneel; S. M. Krishna;

  • 作者单位

    National Institute of Oceanography, Dona Paula, Goa, India;

    Indian Institute of Tropical Meteorology, Pashan, Pune, India;

    National Institute of Oceanography, Dona Paula, Goa, India;

    Naval Physical and Oceanographic Laboratory, Kochi, India;

    Naval Physical and Oceanographic Laboratory, Kochi, India;

    National Institute of Oceanography, Dona Paula, Goa, India;

    Indian National Center for Ocean Information Services, Hyderabad, India;

    Space Application Centre, Ahmedabad, India;

    Cochin University of Science and Technology, Kochi, India;

    Cochin University of Science and Technology, Kochi, India;

    National Institute of Oceanography, Dona Paula, Goa, India;

    National Institute of Oceanography, Dona Paula, Goa, India;

    National Institute of Oceanography, Dona Paula, Goa, India;

    Indian National Center for Ocean Information Services, Hyderabad, India;

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