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Influence of ocean tides on the general ocean circulation in the early Eocene

机译：海潮对早期海洋循环的影响

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摘要

The early Eocene (approximate to 56-50 million years ago) was characterized by higher surface temperatures and a reduced meridional temperature gradient, compared to present-day conditions. The origin of the decreased meridional temperature gradient is still subject to discussion and might be linked to tides. Tidal mixing could have enhanced the meridional heat transport and thereby decreased the meridional temperature gradient. We test this hypothesis by simultaneously modeling tidal dynamics and the general ocean circulation for the early Eocene in a new coupled atmosphere-ocean model setup. We find an interaction between tidal currents and the ocean general circulation that increases horizontal velocities in 25% of the deep ocean to more than 400% of its original value. The global meridional overturning circulation is strengthened thereby locally by 60-100%. However, the oceanic meridional heat transport is only increased by a maximum of 0.1 PW (8%) and a mean of less than 0.018PW (5.1%), thus not decreasing the meridional temperature gradient considerably.
机译：早始新世（大约5600-5000万年前）的特点是，与今天的条件相比，地表温度更高，经向温度梯度减小。经向温度梯度减小的原因仍有待讨论，可能与潮汐有关。潮汐混合增强了经向热量输送，从而降低了经向温度梯度。我们通过在一个新的大气-海洋耦合模式中同时模拟始新世早期的潮汐动力学和海洋环流来验证这一假设。我们发现潮流和海洋环流之间的相互作用，使25%的深海水平速度增加到原始值的400%以上。全球经向翻转环流因此在局部加强了60-100%。然而，海洋经向热输送仅增加了最大0.1 PW（8%），平均值小于0.018PW（5.1%），因此没有显著降低经向温度梯度。

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