气候变化领域集成服务门户(CCPortal): Brazil Current Volume Transport Variability During 2009–2015 From a Long-Term Moored Array at 34.5°S

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DOI	10.1029/2020JC017146
	Brazil Current Volume Transport Variability During 2009–2015 From a Long-Term Moored Array at 34.5°S
	Chidichimo M.P.; Piola A.R.; Meinen C.S.; Perez R.C.; Campos E.J.D.; Dong S.; Lumpkin R.; Garzoli S.L.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	The Brazil Current, the western limb of the subtropical gyre of the South Atlantic Ocean, is one of the major Western Boundary Currents of the global ocean. Here, we present the first multiyear continuous daily time series of Brazil Current absolute volume transport obtained using 6+ years of observations from a line of four pressure-recording inverted echo sounders (PIES) deployed at 34.5°S. The array was augmented in December 2012 with two current meter-equipped PIES and in December 2013 with a moored Acoustic Doppler Current Profiler on the upper continental slope. The Brazil Current is bounded by the sea surface and the neutral density interface separating South Atlantic Central Water and Antarctic Intermediate Water, which is on average at a reference pressure of 628 ± 46 dbar, and it is confined west of 49.5°W. The Brazil Current has a mean strength of −14.0 ± 2.8 Sv (1 Sv ≡ 106 m3 s−1; negative indicates southward flow) with a temporal standard deviation of 8.8 Sv and peak-to-peak range from −41.7 to +20 Sv. About 80% of the absolute transport variance is concentrated at periods shorter than 150 days with a prominent peak at 100 days. The baroclinic component accounts for 85% of the absolute transport variance, but the barotropic variance is not negligible. The baroclinic and barotropic transports are uncorrelated, demonstrating the need to measure both transport components independently. Given the energetic high frequency transport variations, statistically significant seasonal to interannual variability and trends have yet to be detected. © 2021. American Geophysical Union. All Rights Reserved. This article has been contributed to by US Government employees and their work is in the public domain in the USA.
英文关键词	Brazil Current; meridional overturning circulation; observations; transport array; variability; volume transport
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/186312
作者单位	Departamento de Oceanografía, Servicio de Hidrografía Naval, Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina; CNRS – IRD – CONICET UBA, Instituto Franco-Argentino para el Estudio del Clima y sus Impactos (UMI 3351 IFAECI), Buenos Aires, Argentina; Universidad de Buenos Aires, Buenos Aires, Argentina; National Oceanic and Atmospheric Administration, Atlantic Oceanographic and Meteorological Laboratory, Miami, FL, United States; Oceanographic Institute of the University of Sao Paulo, São Paulo, Brazil; Department of Biology, Chemistry, and Environmental Sciences, College of Arts and Sciences, American University of Sharjah, Sharjah, United Arab Emirates
推荐引用方式 GB/T 7714	Chidichimo M.P.,Piola A.R.,Meinen C.S.,等. Brazil Current Volume Transport Variability During 2009–2015 From a Long-Term Moored Array at 34.5°S[J],2021,126(5).
APA	Chidichimo M.P..,Piola A.R..,Meinen C.S..,Perez R.C..,Campos E.J.D..,...&Garzoli S.L..(2021).Brazil Current Volume Transport Variability During 2009–2015 From a Long-Term Moored Array at 34.5°S.Journal of Geophysical Research: Oceans,126(5).
MLA	Chidichimo M.P.,et al."Brazil Current Volume Transport Variability During 2009–2015 From a Long-Term Moored Array at 34.5°S".Journal of Geophysical Research: Oceans 126.5(2021).