Abstract. During the Last Glacial Maximum (LGM), tidal dissipation was about threefold higher than today, which could have led to a considerable increase in vertical mixing. This would enhance the glacial Atlantic Meridional Overturning Circulation (AMOC), contradicting the shoaled AMOC as indicated by paleo proxies. Here, we conduct ocean model simulations to investigate the impact of background climate conditions and tidal mixing on the AMOC during LGM. We successfully reproduce the stratified ocean characteristic of the LGM by accurately simulating the elevated salinity of the deep sea and the rapid temperature decrease in the ocean's upper layers. Our findings indicate that show that the shoaled glacial AMOC is mainly due to strong glacial ocean stratification, irrespective of enhanced tidal dissipation. However, glacial tidal dissipation plays a critical role in the intensification of the AABW during the LGM. Given the critical role of AMOC in (de-)glacial climate evolution, our results highlight the complex interactions of ocean stratification and tidal dissipation that have been neglected so far.

中文翻译：

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尽管潮汐消散剧烈，但AMOC浅滩冰川：垂直分层很重要

摘要。在末次盛冰期（LGM）期间，潮汐消散大约是现在的三倍，这可能导致垂直混合的显着增加。这将增强冰川大西洋经向翻转环流（AMOC），与古代理所表明的浅滩 AMOC 相矛盾。在这里，我们进行海洋模型模拟，以研究末次盛宴期间背景气候条件和潮汐混合对 AMOC 的影响。通过精确模拟深海盐度升高和海洋上层温度快速下降，成功再现了末次海潮的分层海洋特征。我们的研究结果表明，尽管潮汐消散增强，但冰川AMOC的浅滩主要是由于强烈的冰川海洋层化造成的。然而，冰川潮汐消散对于末次盛冰期 AABW 的增强起着至关重要的作用。鉴于 AMOC 在冰（消）冰期气候演化中的关键作用，我们的结果强调了迄今为止被忽视的海洋分层和潮汐消散的复杂相互作用。