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Warm Circumpolar Deep Water transport toward Antarctica driven by local dense water export in canyons

Poleward transport of warm Circumpolar Deep Water (CDW) has been linked to melting of Antarctic ice shelves. However, even the steady-state spatial distribution and mechanisms of CDW transport remain poorly understood. Using a global, eddying ocean model, we explore the relationship between the cros...

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Detalles Bibliográficos
Autores principales: Morrison, A. K., Hogg, A. McC., England, M. H., Spence, P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7195130/
https://www.ncbi.nlm.nih.gov/pubmed/32494658
http://dx.doi.org/10.1126/sciadv.aav2516
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author Morrison, A. K.
Hogg, A. McC.
England, M. H.
Spence, P.
author_facet Morrison, A. K.
Hogg, A. McC.
England, M. H.
Spence, P.
author_sort Morrison, A. K.
collection PubMed
description Poleward transport of warm Circumpolar Deep Water (CDW) has been linked to melting of Antarctic ice shelves. However, even the steady-state spatial distribution and mechanisms of CDW transport remain poorly understood. Using a global, eddying ocean model, we explore the relationship between the cross-slope transports of CDW and descending Dense Shelf Water (DSW). We find large spatial variability in CDW heat and volume transport around Antarctica, with substantially enhanced flow where DSW descends in canyons. The CDW and DSW transports are highly spatially correlated within ~20 km and temporally correlated on subdaily time scales. Focusing on the Ross Sea, we show that the relationship is driven by pulses of overflowing DSW lowering sea surface height, leading to net onshore CDW transport. The majority of simulated onshore CDW transport is concentrated in cold-water regions, rather than warm-water regions, with potential implications for ice-ocean interactions and global sea level rise.
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spelling pubmed-71951302020-06-02 Warm Circumpolar Deep Water transport toward Antarctica driven by local dense water export in canyons Morrison, A. K. Hogg, A. McC. England, M. H. Spence, P. Sci Adv Research Articles Poleward transport of warm Circumpolar Deep Water (CDW) has been linked to melting of Antarctic ice shelves. However, even the steady-state spatial distribution and mechanisms of CDW transport remain poorly understood. Using a global, eddying ocean model, we explore the relationship between the cross-slope transports of CDW and descending Dense Shelf Water (DSW). We find large spatial variability in CDW heat and volume transport around Antarctica, with substantially enhanced flow where DSW descends in canyons. The CDW and DSW transports are highly spatially correlated within ~20 km and temporally correlated on subdaily time scales. Focusing on the Ross Sea, we show that the relationship is driven by pulses of overflowing DSW lowering sea surface height, leading to net onshore CDW transport. The majority of simulated onshore CDW transport is concentrated in cold-water regions, rather than warm-water regions, with potential implications for ice-ocean interactions and global sea level rise. American Association for the Advancement of Science 2020-05-01 /pmc/articles/PMC7195130/ /pubmed/32494658 http://dx.doi.org/10.1126/sciadv.aav2516 Text en Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Articles
Morrison, A. K.
Hogg, A. McC.
England, M. H.
Spence, P.
Warm Circumpolar Deep Water transport toward Antarctica driven by local dense water export in canyons
title Warm Circumpolar Deep Water transport toward Antarctica driven by local dense water export in canyons
title_full Warm Circumpolar Deep Water transport toward Antarctica driven by local dense water export in canyons
title_fullStr Warm Circumpolar Deep Water transport toward Antarctica driven by local dense water export in canyons
title_full_unstemmed Warm Circumpolar Deep Water transport toward Antarctica driven by local dense water export in canyons
title_short Warm Circumpolar Deep Water transport toward Antarctica driven by local dense water export in canyons
title_sort warm circumpolar deep water transport toward antarctica driven by local dense water export in canyons
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7195130/
https://www.ncbi.nlm.nih.gov/pubmed/32494658
http://dx.doi.org/10.1126/sciadv.aav2516
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