Role of dense shelf water in the development of Antarctic submarine canyon morphology
Increased ocean heat supply to the Antarctic continental shelves is projected to cause accelerated ice sheet loss and contribute significantly to global sea-level rise over coming decades. Changes in temperature or salinity of dense shelf waters around Antarctica, resulting from increased glacial me...
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2021
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Online Access: | http://hdl.handle.net/11368/2988039 https://doi.org/10.1016/j.geomorph.2020.107453 https://www.sciencedirect.com/science/article/pii/S0169555X20304268?via=ihub |
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ftunitriestiris:oai:arts.units.it:11368/2988039 2023-05-15T13:40:45+02:00 Role of dense shelf water in the development of Antarctic submarine canyon morphology Gales J. Rebesco M. De Santis L. Bergamasco A. Colleoni F. Kim S. Accettella D. Kovacevic V. Liu Y. Olivo E. Colizza E. Florindo-Lopez C. Zgur F. McKay R. Gales, J. Rebesco, M. De Santis, L. Bergamasco, A. Colleoni, F. Kim, S. Accettella, D. Kovacevic, V. Liu, Y. Olivo, E. Colizza, E. Florindo-Lopez, C. Zgur, F. Mckay, R. 2021 ELETTRONICO http://hdl.handle.net/11368/2988039 https://doi.org/10.1016/j.geomorph.2020.107453 https://www.sciencedirect.com/science/article/pii/S0169555X20304268?via=ihub eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000589918100003 volume:372 firstpage:107453 lastpage:"-" numberofpages:15 journal:GEOMORPHOLOGY http://hdl.handle.net/11368/2988039 doi:10.1016/j.geomorph.2020.107453 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85092701471 https://www.sciencedirect.com/science/article/pii/S0169555X20304268?via=ihub info:eu-repo/semantics/closedAccess Continental slope Meltwater Slope proce Submarine gully info:eu-repo/semantics/article 2021 ftunitriestiris https://doi.org/10.1016/j.geomorph.2020.107453 2023-04-09T06:19:43Z Increased ocean heat supply to the Antarctic continental shelves is projected to cause accelerated ice sheet loss and contribute significantly to global sea-level rise over coming decades. Changes in temperature or salinity of dense shelf waters around Antarctica, resulting from increased glacial meltwater input, have the potential to significantly impact the location and structure of the global Meridional Overturning Circulation, with seabed irregularities such as submarine canyons, driving these flows toward the abyss. Submarine canyons also influence the location of intruding warm water currents by acting as preferential routes for rising Circumpolar Deep Water. These global changes have implications for large-scale effects to atmospheric and oceanic circulation. The ability for numerical modellers to predict these future behaviours is dependent upon our ability to understand both modern and past oceanic, sedimentological and glaciological processes. This knowledge allows ocean models to better predict the flux and pathways of Circumpolar Deep Water delivery to the shelf, and consequently to ice shelf cavities where melt is concentrated. Here we seek to understand how dense shelf water and other continental slope processes influence submarine canyon morphology by analysing newly collected geophysical and oceanographic data from a region of significant and prolonged dense shelf water export, the Hillary Canyon in the Ross Sea. We find that cascading flows of dense shelf water do not contribute to significant gully incision at the shelf edge during interglacial periods, however, are strong enough to prevent gully infilling and contribute to canyon-levee aggradation down-slope. We find buried paleo-gullies beneath gullies incising the modern seafloor. Paleo-gullies occur as single gullies and in complexes indicating that gully activity was continuous over multiple glacial cycles and formed an important role in the development of the shelf edge and upper slope. Glacial cycles likely drive large-scale shifts in ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ross Sea Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste) Antarctic Hillary Canyon ENVELOPE(-175.762,-175.762,-74.544,-74.544) Ross Sea The Antarctic Geomorphology 372 107453 |
institution |
Open Polar |
collection |
Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste) |
op_collection_id |
ftunitriestiris |
language |
English |
topic |
Continental slope Meltwater Slope proce Submarine gully |
spellingShingle |
Continental slope Meltwater Slope proce Submarine gully Gales J. Rebesco M. De Santis L. Bergamasco A. Colleoni F. Kim S. Accettella D. Kovacevic V. Liu Y. Olivo E. Colizza E. Florindo-Lopez C. Zgur F. McKay R. Role of dense shelf water in the development of Antarctic submarine canyon morphology |
topic_facet |
Continental slope Meltwater Slope proce Submarine gully |
description |
Increased ocean heat supply to the Antarctic continental shelves is projected to cause accelerated ice sheet loss and contribute significantly to global sea-level rise over coming decades. Changes in temperature or salinity of dense shelf waters around Antarctica, resulting from increased glacial meltwater input, have the potential to significantly impact the location and structure of the global Meridional Overturning Circulation, with seabed irregularities such as submarine canyons, driving these flows toward the abyss. Submarine canyons also influence the location of intruding warm water currents by acting as preferential routes for rising Circumpolar Deep Water. These global changes have implications for large-scale effects to atmospheric and oceanic circulation. The ability for numerical modellers to predict these future behaviours is dependent upon our ability to understand both modern and past oceanic, sedimentological and glaciological processes. This knowledge allows ocean models to better predict the flux and pathways of Circumpolar Deep Water delivery to the shelf, and consequently to ice shelf cavities where melt is concentrated. Here we seek to understand how dense shelf water and other continental slope processes influence submarine canyon morphology by analysing newly collected geophysical and oceanographic data from a region of significant and prolonged dense shelf water export, the Hillary Canyon in the Ross Sea. We find that cascading flows of dense shelf water do not contribute to significant gully incision at the shelf edge during interglacial periods, however, are strong enough to prevent gully infilling and contribute to canyon-levee aggradation down-slope. We find buried paleo-gullies beneath gullies incising the modern seafloor. Paleo-gullies occur as single gullies and in complexes indicating that gully activity was continuous over multiple glacial cycles and formed an important role in the development of the shelf edge and upper slope. Glacial cycles likely drive large-scale shifts in ... |
author2 |
Gales, J. Rebesco, M. De Santis, L. Bergamasco, A. Colleoni, F. Kim, S. Accettella, D. Kovacevic, V. Liu, Y. Olivo, E. Colizza, E. Florindo-Lopez, C. Zgur, F. Mckay, R. |
format |
Article in Journal/Newspaper |
author |
Gales J. Rebesco M. De Santis L. Bergamasco A. Colleoni F. Kim S. Accettella D. Kovacevic V. Liu Y. Olivo E. Colizza E. Florindo-Lopez C. Zgur F. McKay R. |
author_facet |
Gales J. Rebesco M. De Santis L. Bergamasco A. Colleoni F. Kim S. Accettella D. Kovacevic V. Liu Y. Olivo E. Colizza E. Florindo-Lopez C. Zgur F. McKay R. |
author_sort |
Gales J. |
title |
Role of dense shelf water in the development of Antarctic submarine canyon morphology |
title_short |
Role of dense shelf water in the development of Antarctic submarine canyon morphology |
title_full |
Role of dense shelf water in the development of Antarctic submarine canyon morphology |
title_fullStr |
Role of dense shelf water in the development of Antarctic submarine canyon morphology |
title_full_unstemmed |
Role of dense shelf water in the development of Antarctic submarine canyon morphology |
title_sort |
role of dense shelf water in the development of antarctic submarine canyon morphology |
publishDate |
2021 |
url |
http://hdl.handle.net/11368/2988039 https://doi.org/10.1016/j.geomorph.2020.107453 https://www.sciencedirect.com/science/article/pii/S0169555X20304268?via=ihub |
long_lat |
ENVELOPE(-175.762,-175.762,-74.544,-74.544) |
geographic |
Antarctic Hillary Canyon Ross Sea The Antarctic |
geographic_facet |
Antarctic Hillary Canyon Ross Sea The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ross Sea |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000589918100003 volume:372 firstpage:107453 lastpage:"-" numberofpages:15 journal:GEOMORPHOLOGY http://hdl.handle.net/11368/2988039 doi:10.1016/j.geomorph.2020.107453 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85092701471 https://www.sciencedirect.com/science/article/pii/S0169555X20304268?via=ihub |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.geomorph.2020.107453 |
container_title |
Geomorphology |
container_volume |
372 |
container_start_page |
107453 |
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1766139394284060672 |