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The Energetics of Global Thermohaline Circulation and Its Wind Enhancement

机译:全球热盐环流的能量学及其风的增强

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摘要

The energy budget of global thermohaline circulation (THC) is numerically investigated using an ocean general circulation model (OGCM) under a realistic configuration. Earlier studies just discuss a globally integrated energy budget. This study intends to draw a comprehensive picture of the global THC by separately calculating the energy budgets for three basins (the Atlantic, Indo-Pacific, and Southern Ocean). The largest mechanical energy source is a kinetic energy (KE) input to the general circulation by wind. Of that, 0.3 TW is converted to gravitational potential energy (GPE), and 80% of the energy conversion occurs in the Southern Ocean. Almost the same quantity of GPE is supplied by vertical mixing. Injected GPE is almost equally dissipated by convective adjustment and the effect of cabbeling, and a large part of that is consumed in the Southern Ocean. A dominant role of the Southern Ocean in the energy balance of THC and importance of the interbasin transport of GPE are found. Then, the enhancement of the meridional overturning circulation in the Atlantic induced by wind in the Southern Ocean is examined. Calculating the energy budget anomaly enables the authors to identify its mechanism as a component of THC.
机译:在实际配置下,使用海洋总循环模型(OGCM)对全球热盐循环(THC)的能量预算进行了数值研究。早期的研究只是讨论全球整合的能源预算。本研究旨在通过分别计算三个流域(大西洋,印度太平洋和南洋)的能源预算来全面了解全球THC。最大的机械能源是通过风输入到一般循环中的动能(KE)。其中,0.3 TW转换为重力势能(GPE),并且80%的能量转换发生在南大洋。垂直混合可提供几乎相同数量的GPE。通过对流调整和缆车晃动的影响,注入的GPE几乎相等地消散,其中很大一部分在南大洋被消耗。发现了南大洋在四氢大麻酚的能量平衡中的主导作用和GPE跨盆地运输的重要性。然后,研究了由南大洋的风引起的大西洋经向翻转环流的增强。通过计算能源预算异常,作者可以确定其机制是THC的组成部分。

著录项

  • 来源
    《Journal of Physical Oceanography》 |2009年第7期|1715-1728|共14页
  • 作者单位

    Center for Climate System Research, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8568, Japan;

    Center for Climate System Research, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8568, Japan;

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