气候变化领域集成服务门户(CCPortal): How Variable Is Mixing Efficiency in the Abyss?

CCPortal

DOI	10.1029/2019GL086813
	How Variable Is Mixing Efficiency in the Abyss?
	Ijichi T.; St. Laurent L.; Polzin K.L.; Toole J.M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:7
英文摘要	Mixing efficiency is an important turbulent flow property in fluid dynamics, whose variability potentially affects the large-scale ocean circulation. However, there are several confusing definitions. Here we compare and contrast patch-wise versus bulk estimates of mixing efficiency in the abyss by revisiting data from previous extensive field surveys in the Brazil Basin. Observed patch-wise efficiency is highly variable over a wide range of turbulence intensity. Bulk efficiency is dominated by rare extreme turbulence events. In the case where enhanced near-bottom turbulence is thought to be driven by breaking of small-scale internal tides, the estimated bulk efficiency is 20%, close to the conventional value of 17%. On the other hand, where enhanced near-bottom turbulence appears to be convectively driven by hydraulic overflows, bulk efficiency is suggested to be as large as 45%, which has implications for a further significant role of overflow mixing on deep-water mass transformation. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Mixing; Tides; Turbulence; Deep water mass; Field surveys; Internal tides; Large-scale ocean circulations; Mixing efficiency; Small scale; Turbulence intensity; Efficiency; abyssal zone; efficiency measurement; fluid dynamics; internal tide; mixing; oceanic circulation; turbulent flow; Atlantic Ocean; Brazil Basin
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/170505
作者单位	Physical Oceanography Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Applied Physics Laboratory, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Ijichi T.,St. Laurent L.,Polzin K.L.,et al. How Variable Is Mixing Efficiency in the Abyss?[J],2020,47(7).
APA	Ijichi T.,St. Laurent L.,Polzin K.L.,&Toole J.M..(2020).How Variable Is Mixing Efficiency in the Abyss?.Geophysical Research Letters,47(7).
MLA	Ijichi T.,et al."How Variable Is Mixing Efficiency in the Abyss?".Geophysical Research Letters 47.7(2020).