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 represents a key location for exploring seafloor morphologies influenced by bottom currents. The present study aims to ca...
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Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
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Elsevier BV
2020
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Subjects: | |
Online Access: | http://hdl.handle.net/10261/213009 https://doi.org/10.1016/j.margeo.2020.106113 https://doi.org/10.13039/501100003329 https://doi.org/10.13039/501100004837 https://doi.org/10.13039/501100000780 |
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ftcsic:oai:digital.csic.es:10261/213009 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Scotia Sea Ona Basin Seafloor morphology Contourites Bottom-current circulation Mass movements |
spellingShingle |
Scotia Sea Ona Basin Seafloor morphology Contourites Bottom-current circulation Mass movements López-Quirós, Adrián Lobo, F. J. Escutia, Carlota García, Marga Hernández-Molina, Francisco J. Pérez, Lara Bohoyo, Fernando Evangelinos, Dimitris Salabarnada, Ariadna Maldonado, Andrés Naveira-Garabato, Alberto Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways |
topic_facet |
Scotia Sea 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 represents 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 combines 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 ... |
author2 |
Ministerio de Ciencia e Innovación (España) European Commission Ministerio de Economía y Competitividad (España) |
format |
Article in Journal/Newspaper |
author |
López-Quirós, Adrián Lobo, F. J. Escutia, Carlota García, Marga Hernández-Molina, Francisco J. Pérez, Lara Bohoyo, Fernando Evangelinos, Dimitris Salabarnada, Ariadna Maldonado, Andrés Naveira-Garabato, Alberto |
author_facet |
López-Quirós, Adrián Lobo, F. J. Escutia, Carlota García, Marga Hernández-Molina, Francisco J. Pérez, Lara Bohoyo, Fernando Evangelinos, Dimitris Salabarnada, Ariadna Maldonado, Andrés Naveira-Garabato, Alberto |
author_sort |
López-Quirós, Adrián |
title |
Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways |
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 |
publisher |
Elsevier BV |
publishDate |
2020 |
url |
http://hdl.handle.net/10261/213009 https://doi.org/10.1016/j.margeo.2020.106113 https://doi.org/10.13039/501100003329 https://doi.org/10.13039/501100004837 https://doi.org/10.13039/501100000780 |
long_lat |
ENVELOPE(-56.000,-56.000,-59.250,-59.250) |
geographic |
Ona Basin Scotia Sea Weddell Weddell Sea |
geographic_facet |
Ona Basin Scotia Sea Weddell Weddell Sea |
genre |
Antarc* Antarctica Scotia Sea Weddell Sea |
genre_facet |
Antarc* Antarctica Scotia Sea Weddell Sea |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2014-60451-C2-1-P info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CGL2015-74216-JIN info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/CTM2017-89711-C2-1-P info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/CTM2017-89711-C2-2-P info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2014-60451-C2-2-P http://dx.doi.org/10.1016/j.margeo.2020.106113 Sí doi:10.1016/j.margeo.2020.106113 issn: 0025-3227 Marine Geology 422: 106113 (2020) http://hdl.handle.net/10261/213009 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100000780 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.margeo.2020.10611310.13039/50110000332910.13039/50110000483710.13039/501100000780 |
_version_ |
1790593738084450304 |
spelling |
ftcsic:oai:digital.csic.es:10261/213009 2024-02-11T09:58:09+01:00 Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways López-Quirós, Adrián Lobo, F. J. Escutia, Carlota García, Marga Hernández-Molina, Francisco J. Pérez, Lara Bohoyo, Fernando Evangelinos, Dimitris Salabarnada, Ariadna Maldonado, Andrés Naveira-Garabato, Alberto Ministerio de Ciencia e Innovación (España) European Commission Ministerio de Economía y Competitividad (España) 2020-04-01 http://hdl.handle.net/10261/213009 https://doi.org/10.1016/j.margeo.2020.106113 https://doi.org/10.13039/501100003329 https://doi.org/10.13039/501100004837 https://doi.org/10.13039/501100000780 unknown Elsevier BV #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2014-60451-C2-1-P info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CGL2015-74216-JIN info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/CTM2017-89711-C2-1-P info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/CTM2017-89711-C2-2-P info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2014-60451-C2-2-P http://dx.doi.org/10.1016/j.margeo.2020.106113 Sí doi:10.1016/j.margeo.2020.106113 issn: 0025-3227 Marine Geology 422: 106113 (2020) http://hdl.handle.net/10261/213009 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100000780 none Scotia Sea Ona Basin Seafloor morphology Contourites Bottom-current circulation Mass movements artículo http://purl.org/coar/resource_type/c_6501 2020 ftcsic https://doi.org/10.1016/j.margeo.2020.10611310.13039/50110000332910.13039/50110000483710.13039/501100000780 2024-01-16T10:54:42Z 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 represents 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 combines 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 ... Article in Journal/Newspaper Antarc* Antarctica Scotia Sea Weddell Sea Digital.CSIC (Spanish National Research Council) Ona Basin ENVELOPE(-56.000,-56.000,-59.250,-59.250) Scotia Sea Weddell Weddell Sea |