Anatomy of the Antarctic Circumpolar Current volume transports through Drake Passage

The 20 year (October 1992 to August 2013) observation-based volume transport time series of the Antarctic Circumpolar Current (ACC) through Drake Passage (DP) across the Jason altimeter track #104 is analyzed to better understand the ACC transport variability and its potential causes. The time serie...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Koenig, Z., Provost, C., Park, Y.-H., Ferrari, R., Sennéchael, N.
Formato: JOUR
Materias:
Antarctic Circumpolar Current
baroclinic
barotropic
basin modes
Drake Passage
transport
altimeter
baroclinic mode
barotropic mode
Jason
sea level change
time series analysis
timescale
volume transport
Shackleton Fracture Zone
Southern Ocean
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_21699275_v121_n4_p2572_Koenig
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_21699275_v121_n4_p2572_Koenig
record_format dspace
spelling todo:paper_21699275_v121_n4_p2572_Koenig2023-10-03T16:39:47Z Anatomy of the Antarctic Circumpolar Current volume transports through Drake Passage Koenig, Z. Provost, C. Park, Y.-H. Ferrari, R. Sennéchael, N. Antarctic Circumpolar Current baroclinic barotropic basin modes Drake Passage transport altimeter baroclinic mode barotropic mode Jason sea level change time series analysis timescale volume transport Antarctic Circumpolar Current Drake Passage Shackleton Fracture Zone Southern Ocean The 20 year (October 1992 to August 2013) observation-based volume transport time series of the Antarctic Circumpolar Current (ACC) through Drake Passage (DP) across the Jason altimeter track #104 is analyzed to better understand the ACC transport variability and its potential causes. The time series of three transport components (total (TT), barotropic (BT), and baroclinic (BC)) referenced to 3000 m present energetic intraseasonal fluctuations, with a salient spectral peak at 50 and 36 days, with the largest (least) variance being associated with the BT (BC) component. Low-frequency variations are much less energetic with a significant variance limited to the annual and biannual timescales and show a nonstationary intermittent link with the Southern Annular Mode and the Nino 3.4 index for interannual timescales. The region around 57°S in the Yaghan Basin appears to be a strategic point for a practical monitoring of the ACC transport, as the whole-track TT is significantly correlated with the local TT (r = 0.53) and BT (r = 0.69) around 57°S. These local BT (and TT) variations are associated with a well-defined tripole pattern in altimetric sea level anomaly (SLA). There is evidence that the tripole pattern associated with BT is locally generated when the BC-associated mesoscale SLAs, which have propagated eastward from an upstream area of DP, cross the Shackleton Fracture Zone to penetrate into the Yaghan Basin. Barotropic basin modes excited within the Yaghan Basin are discussed as a plausible mechanism for the observed energy-containing intraseasonal spectral peaks found in the transport variability. © 2016. American Geophysical Union. All Rights Reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_21699275_v121_n4_p2572_Koenig
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Antarctic Circumpolar Current
baroclinic
barotropic
basin modes
Drake Passage
transport
altimeter
baroclinic mode
barotropic mode
Jason
sea level change
time series analysis
timescale
volume transport
Antarctic Circumpolar Current
Drake Passage
Shackleton Fracture Zone
Southern Ocean
spellingShingle Antarctic Circumpolar Current
baroclinic
barotropic
basin modes
Drake Passage
transport
altimeter
baroclinic mode
barotropic mode
Jason
sea level change
time series analysis
timescale
volume transport
Antarctic Circumpolar Current
Drake Passage
Shackleton Fracture Zone
Southern Ocean
Koenig, Z.
Provost, C.
Park, Y.-H.
Ferrari, R.
Sennéchael, N.
Anatomy of the Antarctic Circumpolar Current volume transports through Drake Passage
topic_facet Antarctic Circumpolar Current
baroclinic
barotropic
basin modes
Drake Passage
transport
altimeter
baroclinic mode
barotropic mode
Jason
sea level change
time series analysis
timescale
volume transport
Antarctic Circumpolar Current
Drake Passage
Shackleton Fracture Zone
Southern Ocean
description The 20 year (October 1992 to August 2013) observation-based volume transport time series of the Antarctic Circumpolar Current (ACC) through Drake Passage (DP) across the Jason altimeter track #104 is analyzed to better understand the ACC transport variability and its potential causes. The time series of three transport components (total (TT), barotropic (BT), and baroclinic (BC)) referenced to 3000 m present energetic intraseasonal fluctuations, with a salient spectral peak at 50 and 36 days, with the largest (least) variance being associated with the BT (BC) component. Low-frequency variations are much less energetic with a significant variance limited to the annual and biannual timescales and show a nonstationary intermittent link with the Southern Annular Mode and the Nino 3.4 index for interannual timescales. The region around 57°S in the Yaghan Basin appears to be a strategic point for a practical monitoring of the ACC transport, as the whole-track TT is significantly correlated with the local TT (r = 0.53) and BT (r = 0.69) around 57°S. These local BT (and TT) variations are associated with a well-defined tripole pattern in altimetric sea level anomaly (SLA). There is evidence that the tripole pattern associated with BT is locally generated when the BC-associated mesoscale SLAs, which have propagated eastward from an upstream area of DP, cross the Shackleton Fracture Zone to penetrate into the Yaghan Basin. Barotropic basin modes excited within the Yaghan Basin are discussed as a plausible mechanism for the observed energy-containing intraseasonal spectral peaks found in the transport variability. © 2016. American Geophysical Union. All Rights Reserved.
format JOUR
author Koenig, Z.
Provost, C.
Park, Y.-H.
Ferrari, R.
Sennéchael, N.
author_facet Koenig, Z.
Provost, C.
Park, Y.-H.
Ferrari, R.
Sennéchael, N.
author_sort Koenig, Z.
title Anatomy of the Antarctic Circumpolar Current volume transports through Drake Passage
title_short Anatomy of the Antarctic Circumpolar Current volume transports through Drake Passage
title_full Anatomy of the Antarctic Circumpolar Current volume transports through Drake Passage
title_fullStr Anatomy of the Antarctic Circumpolar Current volume transports through Drake Passage
title_full_unstemmed Anatomy of the Antarctic Circumpolar Current volume transports through Drake Passage
title_sort anatomy of the antarctic circumpolar current volume transports through drake passage
url http://hdl.handle.net/20.500.12110/paper_21699275_v121_n4_p2572_Koenig
work_keys_str_mv AT koenigz anatomyoftheantarcticcircumpolarcurrentvolumetransportsthroughdrakepassage
AT provostc anatomyoftheantarcticcircumpolarcurrentvolumetransportsthroughdrakepassage
AT parkyh anatomyoftheantarcticcircumpolarcurrentvolumetransportsthroughdrakepassage
AT ferrarir anatomyoftheantarcticcircumpolarcurrentvolumetransportsthroughdrakepassage
AT sennechaeln anatomyoftheantarcticcircumpolarcurrentvolumetransportsthroughdrakepassage
_version_ 1782029302986964992

Ejemplares similares