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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ftsouthampton:oai:eprints.soton.ac.uk:439765 2023-07-30T03:58:50+02:00 Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways López-Quirós, Adrián Lobo, Francisco J. Escutia, Carlota García, Marga Hernández-Molina, F. Javier Pérez, Lara F. Bohoyo, Fernando Evangelinos, Dimitris Salabarnada, Ariadna Maldonado, Andrés Naveira Garabato, Alberto C. 2020-04 https://eprints.soton.ac.uk/439765/ English eng López-Quirós, Adrián, Lobo, Francisco J., Escutia, Carlota, García, Marga, Hernández-Molina, F. Javier, Pérez, Lara F., Bohoyo, Fernando, Evangelinos, Dimitris, Salabarnada, Ariadna, Maldonado, Andrés and Naveira Garabato, Alberto C. (2020) Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways. Marine Geology, 422, [106113]. (doi:10.1016/j.margeo.2020.106113 <http://dx.doi.org/10.1016/j.margeo.2020.106113>). Article PeerReviewed 2020 ftsouthampton https://doi.org/10.1016/j.margeo.2020.106113 2023-07-09T22:35:53Z 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 University of Southampton: e-Prints Soton Ona Basin ENVELOPE(-56.000,-56.000,-59.250,-59.250) Scotia Sea Weddell Weddell Sea Marine Geology 422 106113 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
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 ... |
format |
Article in Journal/Newspaper |
author |
López-Quirós, Adrián Lobo, Francisco J. Escutia, Carlota García, Marga Hernández-Molina, F. Javier Pérez, Lara F. Bohoyo, Fernando Evangelinos, Dimitris Salabarnada, Ariadna Maldonado, Andrés Naveira Garabato, Alberto C. |
spellingShingle |
López-Quirós, Adrián Lobo, Francisco J. Escutia, Carlota García, Marga Hernández-Molina, F. Javier Pérez, Lara F. Bohoyo, Fernando Evangelinos, Dimitris Salabarnada, Ariadna Maldonado, Andrés Naveira Garabato, Alberto C. Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways |
author_facet |
López-Quirós, Adrián Lobo, Francisco J. Escutia, Carlota García, Marga Hernández-Molina, F. Javier Pérez, Lara F. Bohoyo, Fernando Evangelinos, Dimitris Salabarnada, Ariadna Maldonado, Andrés Naveira Garabato, Alberto C. |
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 |
publishDate |
2020 |
url |
https://eprints.soton.ac.uk/439765/ |
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 |
López-Quirós, Adrián, Lobo, Francisco J., Escutia, Carlota, García, Marga, Hernández-Molina, F. Javier, Pérez, Lara F., Bohoyo, Fernando, Evangelinos, Dimitris, Salabarnada, Ariadna, Maldonado, Andrés and Naveira Garabato, Alberto C. (2020) Geomorphology of Ona Basin, southwestern Scotia Sea (Antarctica): Decoding the spatial variability of bottom-current pathways. Marine Geology, 422, [106113]. (doi:10.1016/j.margeo.2020.106113 <http://dx.doi.org/10.1016/j.margeo.2020.106113>). |
op_doi |
https://doi.org/10.1016/j.margeo.2020.106113 |
container_title |
Marine Geology |
container_volume |
422 |
container_start_page |
106113 |
_version_ |
1772809572349640704 |