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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：与本日的条件相比，早期的eocene（近似到56-50百万年前）的特征在于表面温度较高，并减少了一个较低的子午温度梯度。减少的优势温度梯度的起源仍有讨论，可能与潮汐相关联。潮汐混合可以增强了优化的热传输，从而降低了子午线温度梯度。我们通过同时建模潮汐动力学和新的耦合大气模型设置，通过同时建模潮汐动力学和一般海洋循环来测试这一假设。我们发现潮流与海洋一般循环之间的相互作用，将25％的深海速度增加到其原始价值的400％以上。全球经络推翻循环加强了60-100％。然而，海洋化学热传递仅增加了0.1pW（8％），平均值小于0.018pW（5.1％），因此显着降低了增长温度梯度。

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