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Influence of the Reflected Rossby Waves on the Western Arabian Sea Upwelling Region

机译：反射的Rossby波对西部阿拉伯海上升区的影响

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摘要

The sea surface temperature (SST) in the western Arabian Sea upwelling region is known to influence the amount of precipitation associated with the Indian summer monsoon. Thus, understanding what determines the SST in this region is an important issue. Using outputs from an ocean general circulation model with and without strong damping in the eastern equatorial Indian Ocean, this study examines how the reflection of semiannual Kelvin waves at the eastern boundary of the Indian Ocean may influence the western Arabian Sea upwelling region. The downwelling Kelvin waves generated in boreal spring are reflected at the eastern boundary and reach the western equatorial Indian Ocean as reflected Rossby waves about 6 months later. The resulting westward current along the equator in the western equatorial Indian Ocean transports warmer water to the western Arabian Sea upwelling region. Thus, the SST in this region becomes colder especially in boreal fall without the reflected Rossby waves. These results are further supported by the analysis of the mixed layer temperature balance. Surprisingly, vertical processes do not contribute to the SST difference, even though the thermocline becomes shallower without the downwelling Rossby waves. This is because the mixed layer is shoaling rapidly from September to November, and there is basically no entrainment of water from below. In contrast, the reflected Rossby waves do not have large impacts on the SST in other seasons mainly because the zonal SST gradient is not as strong and/or the amplitude of Rossby waves is weaker.
机译：众所周知，阿拉伯海西部上升区的海表温度会影响与印度夏季风有关的降水量。因此，了解决定该区域SST的因素是一个重要问题。利用来自赤道东印度洋带强阻尼和不带强阻尼的海洋总环流模型的输出，本研究探讨了印度洋东部边界上半年半开尔文波的反射如何影响阿拉伯西部海域上升区。大约6个月后，在北方春季产生的下降的开尔文波在东部边界处反射并到达赤道西部的印度洋，这是反射的罗斯比波。沿赤道西印度洋赤道形成的西向洋流将较暖的水输送到阿拉伯海西部上升地区。因此，该区域的SST变得更冷，特别是在没有反射的Rossby波的北方坠落中。对混合层温度平衡的分析进一步支持了这些结果。出乎意料的是，即使温跃层变得较浅而没有下沉的罗斯比波，垂直过程也不会造成SST差异。这是因为，从9月到11月，混合层在浅滩上迅速淤积，并且基本上没有从下方夹带水。相反，在其他季节，反射的Rossby波对SST的影响不大，这主要是因为纬向SST梯度不那么强和/或Rossby波的振幅较弱。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第5期|1424-1438|共15页
  • 作者

    TOMOKI TOZUKA; MOTOKI NAGURA; TOSHIO YAMAGATA;

  • 作者单位

    Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;

    Research Institute for Global Change, JAMSTEC, Yokosuka, Japan;

    Application Laboratory, JAMSTEC, Yokohama, Japan;

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