气候变化领域集成服务门户(CCPortal): Scaling of Shear-Generated Turbulence: The Equatorial Thermocline, a Case Study

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DOI	10.1029/2020JC016978
	Scaling of Shear-Generated Turbulence: The Equatorial Thermocline, a Case Study
	Richards K.J.; Natarov A.; Carter G.S.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	We formulate an expression for the turbulent kinetic energy dissipation rate, ϵ, associated with shear-generated turbulence in terms of quantities in the ocean or atmosphere that, depending on the situation, may be measurable or resolved in models. The expression depends on the turbulent vertical length scale, ℓv, the inverse time scale N, and the Richardson number Ri = N2/S2, where S is the vertical shear, with ℓv scaled in a way consistent with theories and observations of stratified turbulence. Unlike previous studies, the focus is not so much on the functional form of Ri, but the vertical variation of the length scale ℓv. Using data from two ∼7-day time series in the western equatorial Pacific, the scaling is compared with the observed ϵ. The scaling works well with the estimated ϵ capturing the differences in amplitude and vertical distribution of the observed ϵ between the two times series. Much of those differences are attributable to changes in the vertical distribution of the length scale ℓv, and in particular the associated turbulent velocity scale, ut. We relate ut to a measure of the fine-scale variations in velocity, (Formula presented.). Our study highlights the need to consider the length scale and its estimation in environmental flows. The implications for the vertical variation of the associated turbulent diffusivity are discussed. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	turbulence
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186341
作者单位	International Pacific Research Center, University of Hawai’i at Mānoa, Honolulu, HI, United States; Department of Oceanography, University of Hawai’i at Mānoa, Honolulu, HI, United States
推荐引用方式 GB/T 7714	Richards K.J.,Natarov A.,Carter G.S.. Scaling of Shear-Generated Turbulence: The Equatorial Thermocline, a Case Study[J],2021,126(5).
APA	Richards K.J.,Natarov A.,&Carter G.S..(2021).Scaling of Shear-Generated Turbulence: The Equatorial Thermocline, a Case Study.Journal of Geophysical Research: Oceans,126(5).
MLA	Richards K.J.,et al."Scaling of Shear-Generated Turbulence: The Equatorial Thermocline, a Case Study".Journal of Geophysical Research: Oceans 126.5(2021).