Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways.

Ona Basin, the westernmost oceanic basin in the southern Scotia Sea, is affected by the opposite flows of Circumpolar Deep Water (CDW) and Weddell Sea Deep Water (WSDW); thus , it represent s a key location for exploring seafloor morphologies influenced by bottom currents. The present study aims to...

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Autores: López-Quirós, Adrián, Lobo, Francisco José, Escutia, Carlota, García-Rodríguez, Mariano, Hernández-Molina, Francisco J., Pérez, Lara F., Bohoyo, Fernando, Evangelinos, Dimitris, Salabarnada, Ariadna, Maldonado, Antonio, Naveira-Garabato, Alberto C.
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/320172
Acceso en línea:http://hdl.handle.net/10261/320172
Access Level:acceso abierto
Palabra clave:Scotia Sea
Medio Marino y Protección Ambiental
Sede Central IEO
Ona Basin
Seafloor morphology
Contourites
Bottom -current circulation
Mass movements
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spelling Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways.López-Quirós, AdriánLobo, Francisco JoséEscutia, CarlotaGarcía-Rodríguez, MarianoHernández-Molina, Francisco J.Pérez, Lara F.Bohoyo, FernandoEvangelinos, DimitrisSalabarnada, AriadnaMaldonado, AntonioNaveira-Garabato, Alberto C.Scotia SeaMedio Marino y Protección AmbientalSede Central IEOOna BasinSeafloor morphologyContouritesBottom -current circulationMass movementsOna Basin, the westernmost oceanic basin in the southern Scotia Sea, is affected by the opposite flows of Circumpolar Deep Water (CDW) and Weddell Sea Deep Water (WSDW); thus , it represent s a key location for exploring seafloor morphologies influenced by bottom currents. The present study aims to capture the spatial arrangement of recent subsurface contourite features , assuming a latitudinal influence of water masses and the interactions between along - and downslope processes, in order to contribute to the knowledge of regional deepwater flow pathways and to the sedimentary model of small sediment -starved oceanic basins. To this end, the investigation combine s an interpretation of multibeam bathymetry and parametric echo sounder seismic data complemented with hydrological data. The distribution of morpho -sedimentary features in Ona Basin reveals two major domains. The southern margin of the basin can be regarded as a mixed/hybrid system containing abundant sediment drifts with channels and contourite moats and a lateral continuity interrupted by downslope morphologies. In contrast, the northern abyssal setting comprises relatively homogeneous large sheeted drifts with superimposed sediment waves, mounded drifts , and several scattered erosive features, likely reflecting the more distinct influence of deepwater contourite processes. Our work demonstrates that tectonic features in the southern basin control the interaction between deepwater along - and downslope processes, as the westward flow of the WSDW is deflected, channelized , and intensified along its westward route. In the northern region, the study indicates an overall clockwise rotation of the WSDW flow, with the spatial and vertical variability of CDW and WSDW affecting the distribution of bottom -current features around seamounts and/or structural highs. The results underscore the importance of sloping interphases in the water mass vertical structure, the degree of basin confinement, and the influence of local bathymetric elevations in sedimentation models of small sediment -starved oceanic basins.SíElsevier BVConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202320232020info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/320172reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésSede Central IEOSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3201722026-05-22T06:33:51Z
dc.title.none.fl_str_mv Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways.
title Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways.
spellingShingle Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways.
López-Quirós, Adrián
Scotia Sea
Medio Marino y Protección Ambiental
Sede Central IEO
Ona Basin
Seafloor morphology
Contourites
Bottom -current circulation
Mass movements
title_short Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways.
title_full Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways.
title_fullStr Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways.
title_full_unstemmed Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways.
title_sort Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways.
dc.creator.none.fl_str_mv López-Quirós, Adrián
Lobo, Francisco José
Escutia, Carlota
García-Rodríguez, Mariano
Hernández-Molina, Francisco J.
Pérez, Lara F.
Bohoyo, Fernando
Evangelinos, Dimitris
Salabarnada, Ariadna
Maldonado, Antonio
Naveira-Garabato, Alberto C.
author López-Quirós, Adrián
author_facet López-Quirós, Adrián
Lobo, Francisco José
Escutia, Carlota
García-Rodríguez, Mariano
Hernández-Molina, Francisco J.
Pérez, Lara F.
Bohoyo, Fernando
Evangelinos, Dimitris
Salabarnada, Ariadna
Maldonado, Antonio
Naveira-Garabato, Alberto C.
author_role author
author2 Lobo, Francisco José
Escutia, Carlota
García-Rodríguez, Mariano
Hernández-Molina, Francisco J.
Pérez, Lara F.
Bohoyo, Fernando
Evangelinos, Dimitris
Salabarnada, Ariadna
Maldonado, Antonio
Naveira-Garabato, Alberto C.
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Scotia Sea
Medio Marino y Protección Ambiental
Sede Central IEO
Ona Basin
Seafloor morphology
Contourites
Bottom -current circulation
Mass movements
topic Scotia Sea
Medio Marino y Protección Ambiental
Sede Central IEO
Ona Basin
Seafloor morphology
Contourites
Bottom -current circulation
Mass movements
description Ona Basin, the westernmost oceanic basin in the southern Scotia Sea, is affected by the opposite flows of Circumpolar Deep Water (CDW) and Weddell Sea Deep Water (WSDW); thus , it represent s a key location for exploring seafloor morphologies influenced by bottom currents. The present study aims to capture the spatial arrangement of recent subsurface contourite features , assuming a latitudinal influence of water masses and the interactions between along - and downslope processes, in order to contribute to the knowledge of regional deepwater flow pathways and to the sedimentary model of small sediment -starved oceanic basins. To this end, the investigation combine s an interpretation of multibeam bathymetry and parametric echo sounder seismic data complemented with hydrological data. The distribution of morpho -sedimentary features in Ona Basin reveals two major domains. The southern margin of the basin can be regarded as a mixed/hybrid system containing abundant sediment drifts with channels and contourite moats and a lateral continuity interrupted by downslope morphologies. In contrast, the northern abyssal setting comprises relatively homogeneous large sheeted drifts with superimposed sediment waves, mounded drifts , and several scattered erosive features, likely reflecting the more distinct influence of deepwater contourite processes. Our work demonstrates that tectonic features in the southern basin control the interaction between deepwater along - and downslope processes, as the westward flow of the WSDW is deflected, channelized , and intensified along its westward route. In the northern region, the study indicates an overall clockwise rotation of the WSDW flow, with the spatial and vertical variability of CDW and WSDW affecting the distribution of bottom -current features around seamounts and/or structural highs. The results underscore the importance of sloping interphases in the water mass vertical structure, the degree of basin confinement, and the influence of local bathymetric elevations in sedimentation models of small sediment -starved oceanic basins.
publishDate 2020
dc.date.none.fl_str_mv 2020
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/320172
url http://hdl.handle.net/10261/320172
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Sede Central IEO
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier BV
publisher.none.fl_str_mv Elsevier BV
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869413087923142656
score 15,812429

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