Sensitivity of Deep Ocean Mixing to Local Internal Tide Breaking and Mixing Efficiency
Sensitivity of Deep Ocean Mixing to Local Internal Tide Breaking and Mixing Efficiency
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DOI：
10.1029/2019gl085056
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发表时间：
2019-12
影响因子：
5.2
通讯作者：
L. Cimoli;Colm‐cille P. Caulfield;H. Johnson;D. Marshall;A. Mashayek;A. N. Naveira Garabato;C. Vic
中科院分区：
文献类型：
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作者：
L. Cimoli;Colm‐cille P. Caulfield;H. Johnson;D. Marshall;A. Mashayek;A. N. Naveira Garabato;C. Vic
最近在量化参数方面取得了进展，这些参数描述了局部耗散的内部潮汐能量的比例和diapycnal混合的“效率”，即diapycnal混合率与动能耗散率的比率。我们发现，海洋潮汐混合是非平凡的敏感，这些参数的协变。每次改变这些参数中的一个可能会导致底辟混合驱动的上升流和下降流的模式出现重大错误，并导致混合的高估和低估，从而使全球综合深环流的净速率显得合理。然而，当这两个参数被允许协变和空间可变时，在深海中的上升流和下降流的局部速率显著不同。这些研究结果具有重要意义的海洋热量，碳，营养物质和其他示踪剂的预算在大气环流模式的代表性。
There have been recent advancements in the quantification of parameters describing the proportion of internal tide energy being dissipated locally and the “efficiency” of diapycnal mixing, that is, the ratio of the diapycnal mixing rate to the kinetic energy dissipation rate. We show that oceanic tidal mixing is nontrivially sensitive to the covariation of these parameters. Varying these parameters one at a time can lead to significant errors in the patterns of diapycnal mixing‐driven upwelling and downwelling and to the over and under estimation of mixing in such a way that the net rate of globally integrated deep circulation appears reasonable. However, the local rates of upwelling and downwelling in the deep ocean are significantly different when both parameters are allowed to covary and be spatially variable. These findings have important implications for the representation of oceanic heat, carbon, nutrients, and other tracer budgets in general circulation models.