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首页> 外文期刊>Journal of oceanography >Numerical Study of the Meridional Overturning Circulation with 'Mixing Hotspots' in the Pacific Ocean
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Numerical Study of the Meridional Overturning Circulation with 'Mixing Hotspots' in the Pacific Ocean

机译：太平洋“混合热点”子午倾覆环流的数值研究

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摘要

Using an idealized ocean general circulation model, we examine the effect of "mixing hotspots" (localized regions of intense diapycnal mixing) predicted based on internal wave-wave interaction theory (Hibiya et al., 2006) on the meridional overturning circulation of the Pacific Ocean. Although the assumed diapycnal diffusivity in the mixing hotspots is a little larger than the predicted value, the upwelling in the mixing hotspots is not sufficient to balance the deep-water production; out of 17 Sv of the down welled water along the southern boundary, only 9.2 Sv is found to upwell in the mixing hotspots. The imbalance as much as 7.8 Sv is compensated by entrainment into the surface mixed layer in the vicinity of the down welling region. As a result, the northward transport of the deep water crossing the equator is limited to 5.5 Sv, much less than estimated from previous current meter moorings and hydrographic surveys. One plausible explanation for this is that the magnitude of the meridional overturning circulation of the Pacific Ocean has been overestimated by these observations. We raise doubts about the validity of the previous ocean general circulation models where diapycnal diffusivity is assigned ad hoc to attain the current magnitude suggested from current meter moorings and hydrographic surveys.
机译：使用理想的海洋总环流模型，我们研究了基于内部波波相互作用理论（Hibiya等，2006）预测的“混合热点”（强烈的斜向混合的局部区域）对太平洋子午翻转环流的影响海洋。尽管在混合热点中假定的对角线扩散率略大于预测值，但在混合热点中的上升流不足以平衡深水产量。沿着南部边界的井水中有17 Sv，只有9.2 Sv在混合热点上升。通过夹带到井下区域附近的表面混合层中，可以补偿高达7.8 Sv的不平衡量。结果，穿过赤道的深水向北的输送被限制在5.5 Sv，远低于先前的当前水表系泊和水文勘测的估计。一个合理的解释是，这些观测结果高估了太平洋子午翻转环流的大小。我们对以前的海洋总环流模型的有效性提出了疑问，在该模型中，专门分配了diapycnal扩散系数，以达到当前水表系泊和水文测量所建议的当前大小。

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