气候变化领域集成服务门户(CCPortal): Roles of Shear and Convection in Driving Mixing in the Ocean

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DOI	10.1029/2020GL089455
	Roles of Shear and Convection in Driving Mixing in the Ocean
	Ivey G.N.; Bluteau C.E.; Gayen B.; Jones N.L.; Sohail T.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:3
英文摘要	Using field, numerical, and laboratory studies, we consider the roles of both shear and convection in driving mixing in the interior of the density-stratified ocean. Shear mixing dominates when the Richardson number Ri < 0.25, convective mixing dominates when Ri > 1.0, and in the intermediate regime when 0.25 < Ri < 1.0 both shear and convection can contribute to mixing. For pure shear mixing the mixing efficiency Rif approaches 0.5, while for pure convective mixing the mixing efficiency Rif approaches 0.75. The diapycnal diffusivities for the two mechanisms are given by very different expressions. Despite these complexities, a simple mixing length model using the mean flow shear S provides robust estimates of diffusivity across the range 0 < Ri < 2. To account for the roles of both shear and convection over this range of Ri, we also formulate a modified version of the empirical KPP model for parameterizing ocean mixing in numerical models. © 2020. The Authors.
英文关键词	Efficiency; Shear flow; Convective mixing; Density stratified; Diapycnal diffusivity; Intermediate regimes; Laboratory studies; Mean flow shear; Mixing efficiency; Richardson number; Mixing
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169137
作者单位	Oceans Graduate School and Oceans Institute, University of Western Australia, Crawley, Australia; Institut des Sciences de la Mer, Université du Québec à Rimouski, Rimouski, Canada; Department of Mechanical Engineering, University of Melbourne, Melbourne, Australia; Centre for Atmospheric Oceanic Sciences, Indian Institute of Science, Bangalore, India; School of Mathematics and Statistics, University of New South Wales, Sydney, Australia
推荐引用方式 GB/T 7714	Ivey G.N.,Bluteau C.E.,Gayen B.,et al. Roles of Shear and Convection in Driving Mixing in the Ocean[J],2021,48(3).
APA	Ivey G.N.,Bluteau C.E.,Gayen B.,Jones N.L.,&Sohail T..(2021).Roles of Shear and Convection in Driving Mixing in the Ocean.Geophysical Research Letters,48(3).
MLA	Ivey G.N.,et al."Roles of Shear and Convection in Driving Mixing in the Ocean".Geophysical Research Letters 48.3(2021).