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The atlantic meridional overturning circulation and the cabbeling effect

机译:大西洋经络倾覆循环和坐标型效应

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摘要

North Atlantic meridional density gradients have been identified as a main driver of the Atlantic meridional overturning circulation (AMOC). Due to the cabbeling effect, these density gradients are increasingly dominated by temperature gradients in a warming ocean, and a direct link exists between North Atlantic mean temperature and AMOC strength. This paper quantifies the impact of this mechanism in the Stommel and Gnanadesikan models. Owing to different feedback mechanisms being included, a 18C warming of North Atlantic mean ocean temperature strengthens the AMOC by 3% in the Gnanadesikan model and 8% in the Stommel model. In the Gnanadesikan model that increase is equivalent to a 4% strengthening of Southern Hemisphere winds and can compensate for a 14% increase in the hydrological cycle. Furthermore, mean temperature strongly controls a freshwater forcing threshold for the strong AMOC state, suggesting that the cabbeling effect needs to be considered to explain past and future AMOC variability.
机译:北大西洋化学密度梯度已被识别为大西洋经络推翻流通(AMOC)的主要驱动因素。由于啮合驾驶效果,这些密度梯度越来越多地由温暖海洋中的温度梯度主导,并且在北大西洋平均温度和血管强度之间存在直接连接。本文量化了这种机制在Stommel和Gnanadeikan模型中的影响。由于包括不同的反馈机制,北大西洋的18C变暖的夜间海洋温度在GNANASEDIKAN模型中加强了3%的amoc,在stommel模型中为8%。在Gnanadeikan模型中,增加相当于南半球风的4%,可以弥补水文循环增加14%。此外,平均温度强烈控制强武器状态的淡水强迫阈值,这表明需要考虑解释过去和未来的AMOC变异性。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2085-2086|共2页
  • 作者

    F. Schloesser;

  • 作者单位

    University of Hawai'i at Manoa Honolulu HI United States;

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  • 原文格式 PDF
  • 正文语种 eng
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