Malvinas Current variability from Argo floats and satellite altimetry

Mostrar todas las versiones(2)

The Malvinas Current (MC) is an offshoot of the Antarctic Circumpolar Current (ACC). Downstream of Drake Passage, the northern fronts of the ACC veer northward, cross over the North Scotia Ridge (NSR) and the Malvinas Plateau, and enter the Argentine Basin. We investigate the variations of the MC ci...

Descripción completa

Detalles Bibliográficos
Autores principales:	Artana, C., Ferrari, R., Koenig, Z., Saraceno, M., Piola, A.R., Provost, C.
Formato:	JOUR
Materias:	altimetry Argo floats blocking dissipation eddies Malvinas Current abyssal plain Antarctic Circumpolar Wave Argo atmospheric blocking energy dissipation mesoscale eddy satellite altimetry sea level change seasonal variation trapped wave Antarctic Circumpolar Current Argentine Basin Atlantic Ocean Drake Passage Scotia Ridge Southern Ocean
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_21699275_v121_n7_p4854_Artana
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_21699275_v121_n7_p4854_Artana
record_format	dspace
spelling	todo:paper_21699275_v121_n7_p4854_Artana2023-10-03T16:39:48Z Malvinas Current variability from Argo floats and satellite altimetry Artana, C. Ferrari, R. Koenig, Z. Saraceno, M. Piola, A.R. Provost, C. altimetry Argo floats blocking dissipation eddies Malvinas Current abyssal plain Antarctic Circumpolar Wave Argo atmospheric blocking energy dissipation mesoscale eddy satellite altimetry sea level change seasonal variation trapped wave Antarctic Circumpolar Current Argentine Basin Atlantic Ocean Drake Passage Malvinas Current Scotia Ridge Southern Ocean The Malvinas Current (MC) is an offshoot of the Antarctic Circumpolar Current (ACC). Downstream of Drake Passage, the northern fronts of the ACC veer northward, cross over the North Scotia Ridge (NSR) and the Malvinas Plateau, and enter the Argentine Basin. We investigate the variations of the MC circulation between the NSR and 41°S and their possible relations with the ACC circulation using data from Argo floats and satellite altimetry. The data depict meandering and eddy shedding of the northern ACC jets as they cross the NSR. The altimetry fields show that these eddies are trapped, break down, and dissipate over the Malvinas Plateau, suggesting that this region is a hot spot for dissipation of mesoscale variability. Variations of sea level anomalies (SLA) across the NSR do not impact the MC further north, except for intra-seasonal variability associated with coastal trapped waves. Altimetry and float trajectories show events during which a large fraction of the MC is cut off from the ACC. Blocking events at around 48.5°S are a recurrent feature of the MC circulation. Over the 23 year altimetry record, we detected 26 events during which the MC surface transport at 48.5°S was reduced to less than half its long-term mean. Blocking events last from 10 to 35 days and do not present any significant trend. These events were tracked back to positive SLA that built up over the Argentine Abyssal Plain. Future work is needed to understand the processes responsible for these blocking events. © 2016. American Geophysical Union. All Rights Reserved. Fil:Saraceno, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_21699275_v121_n7_p4854_Artana
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	altimetry Argo floats blocking dissipation eddies Malvinas Current abyssal plain Antarctic Circumpolar Wave Argo atmospheric blocking energy dissipation mesoscale eddy satellite altimetry sea level change seasonal variation trapped wave Antarctic Circumpolar Current Argentine Basin Atlantic Ocean Drake Passage Malvinas Current Scotia Ridge Southern Ocean
spellingShingle	altimetry Argo floats blocking dissipation eddies Malvinas Current abyssal plain Antarctic Circumpolar Wave Argo atmospheric blocking energy dissipation mesoscale eddy satellite altimetry sea level change seasonal variation trapped wave Antarctic Circumpolar Current Argentine Basin Atlantic Ocean Drake Passage Malvinas Current Scotia Ridge Southern Ocean Artana, C. Ferrari, R. Koenig, Z. Saraceno, M. Piola, A.R. Provost, C. Malvinas Current variability from Argo floats and satellite altimetry
topic_facet	altimetry Argo floats blocking dissipation eddies Malvinas Current abyssal plain Antarctic Circumpolar Wave Argo atmospheric blocking energy dissipation mesoscale eddy satellite altimetry sea level change seasonal variation trapped wave Antarctic Circumpolar Current Argentine Basin Atlantic Ocean Drake Passage Malvinas Current Scotia Ridge Southern Ocean
description	The Malvinas Current (MC) is an offshoot of the Antarctic Circumpolar Current (ACC). Downstream of Drake Passage, the northern fronts of the ACC veer northward, cross over the North Scotia Ridge (NSR) and the Malvinas Plateau, and enter the Argentine Basin. We investigate the variations of the MC circulation between the NSR and 41°S and their possible relations with the ACC circulation using data from Argo floats and satellite altimetry. The data depict meandering and eddy shedding of the northern ACC jets as they cross the NSR. The altimetry fields show that these eddies are trapped, break down, and dissipate over the Malvinas Plateau, suggesting that this region is a hot spot for dissipation of mesoscale variability. Variations of sea level anomalies (SLA) across the NSR do not impact the MC further north, except for intra-seasonal variability associated with coastal trapped waves. Altimetry and float trajectories show events during which a large fraction of the MC is cut off from the ACC. Blocking events at around 48.5°S are a recurrent feature of the MC circulation. Over the 23 year altimetry record, we detected 26 events during which the MC surface transport at 48.5°S was reduced to less than half its long-term mean. Blocking events last from 10 to 35 days and do not present any significant trend. These events were tracked back to positive SLA that built up over the Argentine Abyssal Plain. Future work is needed to understand the processes responsible for these blocking events. © 2016. American Geophysical Union. All Rights Reserved.
format	JOUR
author	Artana, C. Ferrari, R. Koenig, Z. Saraceno, M. Piola, A.R. Provost, C.
author_facet	Artana, C. Ferrari, R. Koenig, Z. Saraceno, M. Piola, A.R. Provost, C.
author_sort	Artana, C.
title	Malvinas Current variability from Argo floats and satellite altimetry
title_short	Malvinas Current variability from Argo floats and satellite altimetry
title_full	Malvinas Current variability from Argo floats and satellite altimetry
title_fullStr	Malvinas Current variability from Argo floats and satellite altimetry
title_full_unstemmed	Malvinas Current variability from Argo floats and satellite altimetry
title_sort	malvinas current variability from argo floats and satellite altimetry
url	http://hdl.handle.net/20.500.12110/paper_21699275_v121_n7_p4854_Artana
work_keys_str_mv	AT artanac malvinascurrentvariabilityfromargofloatsandsatellitealtimetry AT ferrarir malvinascurrentvariabilityfromargofloatsandsatellitealtimetry AT koenigz malvinascurrentvariabilityfromargofloatsandsatellitealtimetry AT saracenom malvinascurrentvariabilityfromargofloatsandsatellitealtimetry AT piolaar malvinascurrentvariabilityfromargofloatsandsatellitealtimetry AT provostc malvinascurrentvariabilityfromargofloatsandsatellitealtimetry
_version_	1807317013179138048

Malvinas Current variability from Argo floats and satellite altimetry

Ejemplares similares