气候变化领域集成服务门户(CCPortal): Revisiting the Malvinas Current Upper Circulation and Water Masses Using a High-Resolution Ocean Reanalysis

CCPortal

DOI	10.1029/2021JC017271
	Revisiting the Malvinas Current Upper Circulation and Water Masses Using a High-Resolution Ocean Reanalysis
	Artana C.; Provost C.; Poli L.; Ferrari R.; Lellouche J.-M.
发表日期	2021
ISSN	21699275
卷号	126 期号:6
英文摘要	We use 25 years of a high-resolution ocean reanalysis (1/12°) to revisit the Malvinas Current (MC) from the South (Drake Passage) to the North (Brazil-Malvinas Confluence) from the synoptic to interannual time scales. The Malvinas Plateau is home to active eddy mixing, eddy dissipation and deep winter mixed layers occasionally reaching 600 m depth. The MC is organized in two jets which merge around 44°S as the continental slope steepens. The upper 900 m transport mean decreases from 40 Sv at 51°S to 35 Sv at 41°S indicating offshore leakage along the MC path. The MC plays a minor role in the velocity variations observed at the Confluence at seasonal and interannual scales; those are driven by changes in the intensity of the Brazil Current over the slope (34–36°S). Computing MC transport time series at different latitudes requires care because the section eastern limits are embedded in an energetic region. Transport time series were produced at selected latitudes using different criteria and showed common features. They show little seasonality (relative seasonal standard deviation of 2%) and no significant trend. The MC is a steady current: the relative standard deviation is on the order of 10% increasing to 20% near and on the Malvinas Plateau and near the Confluence. In contrast, velocity trends are large in the Brazil Current with the overshoot migrating southward. The associated increase in mesoscale activity south of 44°S in the Argentine Basin might contribute to blocking events occasionally reducing the MC transport. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	jets; Malvinas Current; Ocean reanalysis; volume transport; water mass modification; winter mixed layers
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/186261
作者单位	MERCATOR-OCEAN, Parc Technologique du CanalRamonville Saint Agne, France; Laboratoire LOCEAN-IPSL, Sorbonne Université (UPMC, Univ. Paris 6), CNRS, IRD, MNHN, Paris, France; CIMA/CONICET-UBA and UMI IFAECI-3351, Buenos Aires, Argentina
推荐引用方式 GB/T 7714	Artana C.,Provost C.,Poli L.,et al. Revisiting the Malvinas Current Upper Circulation and Water Masses Using a High-Resolution Ocean Reanalysis[J],2021,126(6).
APA	Artana C.,Provost C.,Poli L.,Ferrari R.,&Lellouche J.-M..(2021).Revisiting the Malvinas Current Upper Circulation and Water Masses Using a High-Resolution Ocean Reanalysis.Journal of Geophysical Research: Oceans,126(6).
MLA	Artana C.,et al."Revisiting the Malvinas Current Upper Circulation and Water Masses Using a High-Resolution Ocean Reanalysis".Journal of Geophysical Research: Oceans 126.6(2021).