Controlling spurious diapycnal mixing in eddy-resolving height-coordinate ocean models - Insights from virtual deliberate tracer release experiments
Controlling spurious diapycnal mixing in eddy-resolving height-coordinate ocean models - Insights from virtual deliberate tracer release experiments
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DOI：
10.1016/j.ocemod.2011.12.001
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发表时间：
2012-01-01
期刊：
影响因子：
3.2
通讯作者：
Barrier, Nicolas
中科院分区：
文献类型：
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作者：
Hill, Chris;Ferreira, David;Barrier, Nicolas
通过适当关注所采用的示踪剂平流方案，可以很容易地解决与涡流、锋面流中的虚假双密度混合相关的 z 坐标模型的明显局限性。事实证明，普拉瑟及其合作者开发的用于平流层的示踪平流方案极大地提高了涡流的保真度，将虚假的二重混合水平降低到低于现场实验中直接测量的水平，类似于 1 x 10(-5) m(2) s(-1)。这种方法产生了一个模型，其中地转涡流在海洋内部是准绝热的，因此残余平均翻转环流几乎与密度等值线完美对齐。麻省理工学院大气环流模型的折返通道配置近似于南极绕极流，用于研究这些问题。海洋故意示踪剂释放现场实验的虚拟模拟强化了我们的结论，产生了与现场实验非常相似的被动示踪剂解决方案。 (C) 2011 Elsevier Ltd. 保留所有权利。
A perceived limitation of z-coordinate models associated with spurious diapycnal mixing in eddying, frontal flow, can be readily addressed through appropriate attention to the tracer advection schemes employed. It is demonstrated that tracer advection schemes developed by Prather and collaborators for application in the stratosphere, greatly improve the fidelity of eddying flows, reducing levels of spurious diapycnal mixing to below those directly measured in field experiments, similar to 1 x 10(-5) m(2) s(-1). This approach yields a model in which geostrophic eddies are quasi-adiabatic in the ocean interior, so that the residual-mean overturning circulation aligns almost perfectly with density contours. A reentrant channel configuration of the MIT General Circulation Model, that approximates the Antarctic Circumpolar Current, is used to examine these issues. Virtual analogs of ocean deliberate tracer release field experiments reinforce our conclusion, producing passive tracer solutions that parallel field experiments remarkably well. (C) 2011 Elsevier Ltd. All rights reserved.