气候变化领域集成服务门户(CCPortal): A Newly Observed Quasi-stationary Subsurface Anticyclone of the North Brazil Undercurrent at 4°S: The Potiguar Eddy

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DOI	10.1029/2020JC016268
	A Newly Observed Quasi-stationary Subsurface Anticyclone of the North Brazil Undercurrent at 4°S: The Potiguar Eddy
	Krelling A.P.M.; da Silveira I.C.A.; Polito P.S.; Gangopadhyay A.; Martins R.P.; Lima J.A.M.; Marin F.D.O.
发表日期	2020
ISSN	21699275
卷号	125 期号:10
英文摘要	This study describes a newly discovered subsurface anticyclone, called the Potiguar Eddy (PE) centered at about 4°S, 36.5°W, along the western flank of the North Brazil Undercurrent (NBUC). The PE is a quasi-stationary elliptical feature, with major and minor axes of approximately 330 and 130 km. It extends vertically from 100 to 400 m, with maximum velocities of 0.6 m s−1 and recirculates about 2 Sv of waters from the NBUC. Despite the presence of the PE in subpycnocline waters, the surface flow is predominantly northwestward throughout the year. Analysis of moored current meter data revealed a depth-dependent variability that reaches its highest values between about 100 and 400 m, coincident with the PE. This variability is found to be associated with a 20- to 30-day second baroclinic mode waves, which can strengthen, weaken, or even reverse the currents of the PE. We highlight the possible causes for this variability to include coastally trapped waves, instabilities, and tropical instability waves or a combination thereof—which opens up new study topics for future research. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	anticyclonic eddy; coastally trapped waves; North Brazil Undercurrent; Potiguar Eddy; subsurface eddy; Tropical South Atlantic
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/186649
作者单位	Instituto de Ciências do Mar, Universidade Federal do Ceara, Fortaleza, Brazil; Instituto Oceanográfico, Universidade de São Paulo, São Paulo, Brazil; School for Marine Science and Technology, University of Massachusetts Dartmouth, Dartmouth, MA, United States; Petróleo Brasileiro S.A., São Paulo, Brazil; Brazilian Navy, Brasilia, Brazil
推荐引用方式 GB/T 7714	Krelling A.P.M.,da Silveira I.C.A.,Polito P.S.,et al. A Newly Observed Quasi-stationary Subsurface Anticyclone of the North Brazil Undercurrent at 4°S: The Potiguar Eddy[J],2020,125(10).
APA	Krelling A.P.M..,da Silveira I.C.A..,Polito P.S..,Gangopadhyay A..,Martins R.P..,...&Marin F.D.O..(2020).A Newly Observed Quasi-stationary Subsurface Anticyclone of the North Brazil Undercurrent at 4°S: The Potiguar Eddy.Journal of Geophysical Research: Oceans,125(10).
MLA	Krelling A.P.M.,et al."A Newly Observed Quasi-stationary Subsurface Anticyclone of the North Brazil Undercurrent at 4°S: The Potiguar Eddy".Journal of Geophysical Research: Oceans 125.10(2020).