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Wind-Driven Seasonal Cycle of the Atlantic Meridional Overturning Circulation

机译：大西洋子午倾覆环流的风驱动季节性周期

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摘要

The dynamical processes governing the seasonal cycle of the Atlantic meridional overturning circulation (AMOC) are studied using a variety of models, ranging from a simple forced Rossby wave model to an eddy-resolving ocean general circulation model. The AMOC variability is decomposed into Ekman and geo-strophic transport components, which reveal that the seasonality of the AMOC is determined by both components in the extratropics and dominated by the Ekman transport in the tropics. The physics governing the seasonal fluctuations of the AMOC are explored in detail at three latitudes (26.5°N, 6°N, and 34.5°S). While the Ekman transport is directly related to zonal wind stress seasonality, the comparison between different numerical models shows that the geostrophic transport involves a complex oceanic adjustment to the wind forcing. The oceanic adjustment is further evaluated by separating the zonally integrated geostrophic transport into eastern and western boundary currents and interior flows. The results indicate that the seasonal AMOC cycle in the extratropics is controlled mainly by local boundary effects, where either the western or eastern boundary can be dominant at different latitudes, while in the northern tropics it is the interior flow and its lagged compensation by the western boundary current that determine the seasonal AMOC variability.
机译：使用各种模型研究了控制大西洋子午翻转环流（AMOC）季节周期的动力学过程，从简单的强迫Rossby波模型到解析涡旋的海洋总环流模型。 AMOC的可变性被分解为Ekman和地转运动的分量，这表明AMOC的季节性由温带的两个分量决定，并由热带的Ekman传递控制。在三个纬度（南纬26.5°，北纬6°和北纬34.5°）上，详细探讨了控制AMOC季节性波动的物理学。虽然Ekman运移与纬向风应力季节有直接关系，但不同数值模型之间的比较表明，地转运动涉及对强迫作用的复杂海洋调节。通过将区域整合的地转运动分为东西边界流和内流，进一步评估了海洋调整。结果表明，温带地区的季节性AMOC周期主要受局部边界效应的控制，在不同纬度，西边界或东边界可能占主导地位，而北热带地区则是内部流动，而西部则是滞后补偿。确定季节性AMOC变异性的边界电流。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第6期|1541-1562|共22页
  • 作者

    Jian Zhao; William Johns;

  • 作者单位

    Division of Meteorology and Physical Oceanography, Rosenstiel School of Marine and Atmospheric Science,University of Miami, Miami, Florida;

    Division of MPO,Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149;

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