气候变化领域集成服务门户(CCPortal): On the Role of Turbulent Mixing Produced by Vertical Shear Between the Brazil Current and the Intermediate Western Boundary Current

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DOI	10.1029/2019JC015338
	On the Role of Turbulent Mixing Produced by Vertical Shear Between the Brazil Current and the Intermediate Western Boundary Current
	Lazaneo C.Z.; Napolitano D.C.; da Silveira I.C.A.; Tandon A.; MacDonald D.G.; Ávila R.A.; Calil P.H.R.
发表日期	2020
ISSN	21699275
卷号	125 期号:1
英文摘要	An intensification of the vertical shear is observed below the surface mixed layer at 21°S due to the mutually opposing flows of the Brazil Current and the Intermediate Western Boundary Current. The propensity to develop turbulence and mixing due to vertical shear over intense stabilizing density gradients is an important characteristic of such environments. For the first time, microscale measurements were made in the Brazil Current-Intermediate Western Boundary Current system, providing direct quantitative values of the turbulent fluctuations. Peaks of relative strong dissipation rates of turbulent kinetic energy (O(10-8)W/kg) were observed close to the base of the surface mixed layer. On the other hand, prominent peaks of turbulent kinetic energy dissipation rates of up to 2 orders of magnitude higher than the background were observed at deeper levels, where stratification begins to lose intensity. Analyzing such peaks, caused by intense vertical shear or weak stratification—and sometimes both—, allows a characterization of the local mixing processes and the role played by vertical exchanges of biogeochemical properties. Based on the estimated nitrate gradient and the vertical diffusivity, we show that turbulent mixing driven by vertical shear plays an important role in the supply of nitrate to the upper layer. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	dissipation of turbulent kinetic energy at the Brazil Current/Intermediate WBC boundary; southwestern Atlantic Ocean; upper ocean; vertical diffusivity at the BC-IWBC boundary; vertical turbulent nitrate flux in the BC-IWBC system
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/187010
作者单位	Instituto Oceanográfico, Universidade de São Paulo, São Paulo, Brazil; College of Engineering, University of Massachusetts Dartmouth, Dartmouth, MA, United States; Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Brazil; Institute of Costal Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
推荐引用方式 GB/T 7714	Lazaneo C.Z.,Napolitano D.C.,da Silveira I.C.A.,et al. On the Role of Turbulent Mixing Produced by Vertical Shear Between the Brazil Current and the Intermediate Western Boundary Current[J],2020,125(1).
APA	Lazaneo C.Z..,Napolitano D.C..,da Silveira I.C.A..,Tandon A..,MacDonald D.G..,...&Calil P.H.R..(2020).On the Role of Turbulent Mixing Produced by Vertical Shear Between the Brazil Current and the Intermediate Western Boundary Current.Journal of Geophysical Research: Oceans,125(1).
MLA	Lazaneo C.Z.,et al."On the Role of Turbulent Mixing Produced by Vertical Shear Between the Brazil Current and the Intermediate Western Boundary Current".Journal of Geophysical Research: Oceans 125.1(2020).