气候变化领域集成服务门户(CCPortal): VENM: An Algorithm to Accurately Calculate Neutral Slopes and Gradients

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DOI	10.1029/2019MS001613
	VENM: An Algorithm to Accurately Calculate Neutral Slopes and Gradients
	Groeskamp S.; Barker P.M.; McDougall T.J.; Abernathey R.P.; Griffies S.M.
发表日期	2019
ISSN	19422466
起始页码	1917
结束页码	1939
卷号	11 期号:7
英文摘要	Mesoscale eddies stir along the neutral plane, and the resulting neutral diffusion is a fundamental aspect of subgrid-scale tracer transport in ocean models. Calculating neutral diffusion traditionally involves calculating neutral slopes and three-dimensional tracer gradients. The calculation of the neutral slope traditionally occurs by computing the ratio of the horizontal to vertical locally referenced potential density derivative. However, this approach is problematic in regions of weak vertical stratification, prompting the use of a variety of ad hoc regularization methods that can lead to rather nonphysical dependencies for the resulting neutral tracer gradients. Here we use a VErtical Non-local Method “VENM,” a search algorithm that requires no ad hoc regularization and significantly improves the numerical accuracy of calculating neutral slopes, neutral tracer gradients, and associated neutral diffusive fluxes. We compare and contrast VENM against a more traditional method, using an independent objective neutrality condition combined with estimates of spurious diffusion, heat transport, and water mass transformation rates. VENM is more accurate, both physically and numerically, and should form the basis for future efforts involving neutral diffusion calculations from observations and possibly numerical model simulations. ©2019. The Authors.
英文关键词	algorithms; data analyses; mixing processes; neutral direction; numerical modeling; physical oceanography
语种	英语
scopus关键词	Algorithms; Data reduction; Diffusion; Numerical models; Oceanography; Diffusion calculation; Mixing process; neutral direction; Numerical model simulations; Physical oceanography; Regularization methods; Vertical stratification; Water mass transformation; Numerical methods; algorithm; data acquisition; environmental gradient; mesoscale eddy; mixing; numerical model; ocean; physical oceanography; stratification; three-dimensional modeling; tracer
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156972
作者单位	School of Mathematics and Statistics, University of New South Wales, Sydney, NSW, Australia; Lamont-Doherty Earth Observatory, Columbia University, New York City, NY, United States; NOAA Geophysical Fluid Dynamics Laboratory and Princeton University Program in Atmospheric and Oceanic Sciences, Princeton, NJ, United States
推荐引用方式 GB/T 7714	Groeskamp S.,Barker P.M.,McDougall T.J.,et al. VENM: An Algorithm to Accurately Calculate Neutral Slopes and Gradients[J],2019,11(7).
APA	Groeskamp S.,Barker P.M.,McDougall T.J.,Abernathey R.P.,&Griffies S.M..(2019).VENM: An Algorithm to Accurately Calculate Neutral Slopes and Gradients.Journal of Advances in Modeling Earth Systems,11(7).
MLA	Groeskamp S.,et al."VENM: An Algorithm to Accurately Calculate Neutral Slopes and Gradients".Journal of Advances in Modeling Earth Systems 11.7(2019).