气候变化领域集成服务门户(CCPortal): On Energy and Turbulent Mixing in the Thermocline

CCPortal

DOI	10.1029/2018MS001502
	On Energy and Turbulent Mixing in the Thermocline
	Dewar W.K.; McWilliams J.C.
发表日期	2019
ISSN	19422466
起始页码	578
结束页码	596
卷号	11 期号:3
英文摘要	A new method for computing the rate at which turbulent mixing builds potential energy in the ocean is described. The traditional approach has focused on the rate of change of the background potential energy associated with an adiabatically leveled state. We argue that when examining mixing events, so-called “Thorpe” sorting yields a useful and local measure of diabatically generated potential energy and exhibits some advantages relative to adiabatic leveling. Among these, the open question about the leveling domain is avoided, the fate of kinetic energy during a mixing event is clearly defined, and the computational load associated with the leveling is relieved. The resultant kinetic energy equation leads to a natural definition of mixing efficiency and turbulent diffusivity in terms of sign definite viscous and diffusive contributions. Applications to 2-D Kelvin Helmholtz instability demonstrate the utility of the procedure. We find an integrated efficiency of ≈ 0.15 for a Prandtl number of 1, and of ≈ 0.08 for a Prandtl number of 10. The larger is comparable to the classical value of 0.2 used frequently by the mixing community and smaller than that found in some recent simulations. ©2019. The Authors.
英文关键词	efficiency; turbulent mixing
语种	英语
scopus关键词	Efficiency; Kinetic energy; Kinetics; Molecular physics; Potential energy; Prandtl number; Shock tubes; Turbulent flow; Computational loads; Energy equation; Kelvin- helmholtz instabilities; Mixing efficiency; Rate of change; Traditional approaches; Turbulent diffusivities; Turbulent mixing; Mixing; adiabatic process; efficiency measurement; integrated approach; Kelvin-Helmholtz instability; kinetic energy; potential energy; simulation; thermocline; turbulent mixing
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/156950
作者单位	Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States
推荐引用方式 GB/T 7714	Dewar W.K.,McWilliams J.C.. On Energy and Turbulent Mixing in the Thermocline[J],2019,11(3).
APA	Dewar W.K.,&McWilliams J.C..(2019).On Energy and Turbulent Mixing in the Thermocline.Journal of Advances in Modeling Earth Systems,11(3).
MLA	Dewar W.K.,et al."On Energy and Turbulent Mixing in the Thermocline".Journal of Advances in Modeling Earth Systems 11.3(2019).