The impact of tides on Antarctic ice shelf melting
Tides influence basal melting of individual Antarctic ice shelves, but their net impact on Antarctic-wide ice–ocean interaction has yet to be constrained. Here we quantify the impact of tides on ice shelf melting and the continental shelf seas using a 4 km resolution circum-Antarctic ocean model. Ac...
Published in: | The Cryosphere |
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Copernicus Publications
2022
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Online Access: | https://doi.org/10.5194/tc-16-1409-2022 https://tc.copernicus.org/articles/16/1409/2022/tc-16-1409-2022.pdf https://doaj.org/article/5d640be24969460ab3d22f5a7b9f3fe9 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:5d640be24969460ab3d22f5a7b9f3fe9 2023-05-15T14:00:08+02:00 The impact of tides on Antarctic ice shelf melting O. Richter D. E. Gwyther M. A. King B. K. Galton-Fenzi 2022-04-01 https://doi.org/10.5194/tc-16-1409-2022 https://tc.copernicus.org/articles/16/1409/2022/tc-16-1409-2022.pdf https://doaj.org/article/5d640be24969460ab3d22f5a7b9f3fe9 en eng Copernicus Publications doi:10.5194/tc-16-1409-2022 1994-0416 1994-0424 https://tc.copernicus.org/articles/16/1409/2022/tc-16-1409-2022.pdf https://doaj.org/article/5d640be24969460ab3d22f5a7b9f3fe9 undefined The Cryosphere, Vol 16, Pp 1409-1429 (2022) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.5194/tc-16-1409-2022 2023-01-22T19:35:16Z Tides influence basal melting of individual Antarctic ice shelves, but their net impact on Antarctic-wide ice–ocean interaction has yet to be constrained. Here we quantify the impact of tides on ice shelf melting and the continental shelf seas using a 4 km resolution circum-Antarctic ocean model. Activating tides in the model increases the total basal mass loss by 57 Gt yr−1 (4 %) while decreasing continental shelf temperatures by 0.04 ∘C. The Ronne Ice Shelf features the highest increase in mass loss (44 Gt yr−1, 128 %), coinciding with strong residual currents and increasing temperatures on the adjacent continental shelf. In some large ice shelves tides strongly affect melting in regions where the ice thickness is of dynamic importance to grounded ice flow. Further, to explore the processes that cause variations in melting we apply dynamical–thermodynamical decomposition to the melt drivers in the boundary layer. In most regions, the impact of tidal currents on the turbulent exchange of heat and salt across the ice–ocean boundary layer has a strong contribution. In some regions, however, mechanisms driven by thermodynamic effects are equally or more important, including under the frontal parts of Ronne Ice Shelf. Our results support the importance of capturing tides for robust modelling of glacier systems and shelf seas, as well as motivate future studies to directly assess friction-based parameterizations for the pan-Antarctic domain. Article in Journal/Newspaper Antarc* Antarctic Antarctic Ocean Ice Shelf Ice Shelves Ronne Ice Shelf The Cryosphere Unknown Antarctic Antarctic Ocean Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) The Cryosphere 16 4 1409 1429 |
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Open Polar |
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language |
English |
topic |
geo envir |
spellingShingle |
geo envir O. Richter D. E. Gwyther M. A. King B. K. Galton-Fenzi The impact of tides on Antarctic ice shelf melting |
topic_facet |
geo envir |
description |
Tides influence basal melting of individual Antarctic ice shelves, but their net impact on Antarctic-wide ice–ocean interaction has yet to be constrained. Here we quantify the impact of tides on ice shelf melting and the continental shelf seas using a 4 km resolution circum-Antarctic ocean model. Activating tides in the model increases the total basal mass loss by 57 Gt yr−1 (4 %) while decreasing continental shelf temperatures by 0.04 ∘C. The Ronne Ice Shelf features the highest increase in mass loss (44 Gt yr−1, 128 %), coinciding with strong residual currents and increasing temperatures on the adjacent continental shelf. In some large ice shelves tides strongly affect melting in regions where the ice thickness is of dynamic importance to grounded ice flow. Further, to explore the processes that cause variations in melting we apply dynamical–thermodynamical decomposition to the melt drivers in the boundary layer. In most regions, the impact of tidal currents on the turbulent exchange of heat and salt across the ice–ocean boundary layer has a strong contribution. In some regions, however, mechanisms driven by thermodynamic effects are equally or more important, including under the frontal parts of Ronne Ice Shelf. Our results support the importance of capturing tides for robust modelling of glacier systems and shelf seas, as well as motivate future studies to directly assess friction-based parameterizations for the pan-Antarctic domain. |
format |
Article in Journal/Newspaper |
author |
O. Richter D. E. Gwyther M. A. King B. K. Galton-Fenzi |
author_facet |
O. Richter D. E. Gwyther M. A. King B. K. Galton-Fenzi |
author_sort |
O. Richter |
title |
The impact of tides on Antarctic ice shelf melting |
title_short |
The impact of tides on Antarctic ice shelf melting |
title_full |
The impact of tides on Antarctic ice shelf melting |
title_fullStr |
The impact of tides on Antarctic ice shelf melting |
title_full_unstemmed |
The impact of tides on Antarctic ice shelf melting |
title_sort |
impact of tides on antarctic ice shelf melting |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-1409-2022 https://tc.copernicus.org/articles/16/1409/2022/tc-16-1409-2022.pdf https://doaj.org/article/5d640be24969460ab3d22f5a7b9f3fe9 |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Antarctic Antarctic Ocean Ronne Ice Shelf |
geographic_facet |
Antarctic Antarctic Ocean Ronne Ice Shelf |
genre |
Antarc* Antarctic Antarctic Ocean Ice Shelf Ice Shelves Ronne Ice Shelf The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctic Ocean Ice Shelf Ice Shelves Ronne Ice Shelf The Cryosphere |
op_source |
The Cryosphere, Vol 16, Pp 1409-1429 (2022) |
op_relation |
doi:10.5194/tc-16-1409-2022 1994-0416 1994-0424 https://tc.copernicus.org/articles/16/1409/2022/tc-16-1409-2022.pdf https://doaj.org/article/5d640be24969460ab3d22f5a7b9f3fe9 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-16-1409-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
4 |
container_start_page |
1409 |
op_container_end_page |
1429 |
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1766269122021163008 |