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DOI	10.1016/j.dynatmoce.2019.101096
	NPZ response to eddy-induced upwelling in a Brazil Current ring: A theoretical approach
	Pereira F.; da Silveira I.C.A.; Flierl G.R.; Tandon A.
发表日期	2019
ISSN	03770265
卷号	87
英文摘要	This work explores the effect of a cyclonic mesoscale feature of the Brazil Current (BC) moving northward off SE Brazil (20° S–23° S) in the Nutrients-Phytoplankton-Zooplankton (NPZ) dynamics. We employ the contour dynamics technique in a quasi-geostrophic, inviscid, 1½-layer model set as a meridional jet flowing southward along a rigid western boundary. This hydrodynamical model is coupled to a conventional NPZ model. We evaluate two distinct scenarios: (1) Plankton in a mixed layer (ML) with time-variable depth and no entrainment and; (2) Plankton in an ML held at a fixed depth, which allows entrainment. We perform simulations with different ML depths representing summer (42 m) and winter (86 m) for the region of interest. The presence of the western boundary allows the cyclonic ring to propagate northward due to image effect. The eddy motion produces upwelling (downwelling) in the leading (trailing) edge resulting in different responses in the two scenarios examined. In the variable ML depth simulations, Z is favored relative to P because there is no injection of N. On the other hand, in the fixed ML depth simulations, P is favored relative to Z due to dilution. All simulations show P enrichment within the eddy, but winter simulations show a greater response to the physical forcing. We conclude that the cyclonic eddy shed from BC provides favorable conditions for planktonic growth. Winter-like conditions seem to be more favorable than summer-like ones and, therefore, present more intense blooms associated with the ring. © 2019 Elsevier B.V.
英文关键词	Brazil Current; Contour dynamics; Cyclonic meander; Mesoscale process; NPZ model; Upper ocean
语种	英语
scopus关键词	Dynamics; Image segmentation; Brazil Current; Contour dynamics; Cyclonic meander; Mesoscale process; NPZ models; Upper ocean; Plankton; eddy; hydrodynamics; mesoscale meteorology; modeling; nutrient; phytoplankton; upper ocean; upwelling; zooplankton; Atlantic Ocean; Brazil Current
来源期刊	Dynamics of Atmospheres and Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178365
作者单位	Departamento de Oceanografia Física, Química e Geológica, Instituto Oceanográfico, Universidade de São Paulo, São Paulo, SP 05508, Brazil; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Mechanical Engineering Department, University of Massachusetts Dartmouth, Dartmouth, MA 02747, United States; School for Marine Science & Technology, University of Massachusetts Dartmouth, New Bedford, MA 02744, United States
推荐引用方式 GB/T 7714	Pereira F.,da Silveira I.C.A.,Flierl G.R.,et al. NPZ response to eddy-induced upwelling in a Brazil Current ring: A theoretical approach[J],2019,87.
APA	Pereira F.,da Silveira I.C.A.,Flierl G.R.,&Tandon A..(2019).NPZ response to eddy-induced upwelling in a Brazil Current ring: A theoretical approach.Dynamics of Atmospheres and Oceans,87.
MLA	Pereira F.,et al."NPZ response to eddy-induced upwelling in a Brazil Current ring: A theoretical approach".Dynamics of Atmospheres and Oceans 87(2019).