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首页> 外文期刊>Journal of Physical Oceanography >Meridional Heat Advection due to Mixed Rossby Gravity Waves in the Equatorial Indian Ocean
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Meridional Heat Advection due to Mixed Rossby Gravity Waves in the Equatorial Indian Ocean

机译：赤道印度洋混合Rossby重力波引起的子午热平流

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摘要

This study examines heat advection due to mixed Rossby gravity waves in the equatorial Indian Ocean using moored buoy observations at (0°, 80.5°E) and (0°, 90°E) and an ocean general circulation model (OGCM) output. Variability associated with mixed Rossby gravity waves is defined as that at periods of 10-30 days, where both observations and the OGCM results show high energy in meridional velocity and meridional gradient of temperature. The 10-30-day variability in meridional velocity causes convergence of heat flux onto the equator, the net effect of which amounts to 2.5℃ month~(-1) warming at the depth of the thermocline. Detailed analysis shows that the wave structure manifested in temperature and velocity is tilted in the x-z plane, which causes the phase lag between meridional velocity and meridional temperature gradient to be a half cycle on the equator and results in sizable thermocline warming. An experiment with a linear continuously stratified model shows that the contributions of many baroclinic modes, and the right zonal wavelength of wind forcing, are essential in generating the correct wave structure. It is also shown that contributions of mixed Rossby gravity waves to cross-equatorial heat transport are negligible, as temperature variability associated with this wave mode has a node on the equator.
机译：这项研究使用（0°，80.5°E）和（0°，90°E）的系泊浮标观测值以及海洋总环流模型（OGCM）的输出，检查了赤道印度洋混合Rossby重力波引起的热对流。与混合Rossby引力波相关的变异性定义为在10到30天期间的变异性，其中观测值和OGCM结果都显示出子午速度和子午温度梯度中的高能量。经线速度的10-30天变化会导致热通量汇聚到赤道，其净效应为在温跃层深度变暖2.5℃月〜（-1）。详细的分析表明，以温度和速度表示的波结构在x-z平面中倾斜，这导致子午速度和子午温度梯度之间的相位滞后在赤道上为半个周期，并导致相当大的温跃层变暖。线性连续分层模型的实验表明，许多斜压模式的贡献以及正确的强迫风向波长对生成正确的波结构至关重要。还表明，混合的Rossby重力波对跨赤道热传输的贡献可以忽略不计，因为与此波模式相关的温度变化在赤道上有一个节点。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第1期|343-358|共16页
  • 作者

    Motoki Nagura; Yukio Masumoto; Takanori Horii;

  • 作者单位

    Japan Agency for Marine-Earth Science and Technology/Research Institute for Global Change, 2-15 Natsushima-cho, Yokosuka-city, Kanagawa 237-0061, Japan;

    Japan Agency for Marine-Earth Science and Technology/Research Institute for Global Change, Kanagawa, and The University of Tokyo/Graduate School of Science, Tokyo, Japan;

    Japan Agency for Marine-Earth Science and Technology/Research Institute for Global Change, Kanagawa, Japan;

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