The effect of increased fresh water from Antarctic ice shelves on future trends in Antarctic sea ice
Observations show that, in contrast to the Arctic, the area of Antarctic sea ice has increased since 1979. A potential driver of this significant increase relates to the mass loss of the Antarctic ice sheet. Subsurface ocean warming causes basal ice-shelf melt, freshening the surface waters around A...
Published in: | Annals of Glaciology |
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Online Access: | https://doi.org/10.3189/2015aog69a001 |
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ftzenodo:oai:zenodo.org:894061 2024-09-15T17:48:26+00:00 The effect of increased fresh water from Antarctic ice shelves on future trends in Antarctic sea ice Bintanja, R. Van Oldenborgh, G. J. Katsman, C. A. 2015-01-01 https://doi.org/10.3189/2015aog69a001 unknown Zenodo https://doi.org/10.3189/2015aog69a001 oai:zenodo.org:894061 info:eu-repo/semantics/openAccess Other (Open) info:eu-repo/semantics/article 2015 ftzenodo https://doi.org/10.3189/2015aog69a001 2024-07-26T02:38:52Z Observations show that, in contrast to the Arctic, the area of Antarctic sea ice has increased since 1979. A potential driver of this significant increase relates to the mass loss of the Antarctic ice sheet. Subsurface ocean warming causes basal ice-shelf melt, freshening the surface waters around Antarctica, which leads to increases in sea-ice cover. With climate warming ongoing, future mass-loss rates are projected to accelerate, which has the potential to affect future Antarctic seaice trends. Here we investigate to what extent future sea-ice trends are influenced by projected increases in Antarctic freshwater flux due to subsurface melt, using a state-of-the-art global climate model (EC-Earth) in standardized Climate Model Intercomparison Project phase 5 (CMIP5) climatechange simulations. Virtually all CMIP5 models disregard ocean-ice-sheet interactions and project strongly retreating Antarctic sea ice. Applying various freshwater flux scenarios, we find that the additional fresh water significantly offsets the decline in sea-ice area and is even able to reverse the trend in the strongest freshwater forcing scenario that can reasonably be expected, especially in austral winter. The model also simulates decreasing sea surface temperatures (SSTs), with the SST trends exhibiting strong regional variations that largely correspond to regional sea-ice trends. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Sea ice Zenodo Annals of Glaciology 56 69 120 126 |
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Observations show that, in contrast to the Arctic, the area of Antarctic sea ice has increased since 1979. A potential driver of this significant increase relates to the mass loss of the Antarctic ice sheet. Subsurface ocean warming causes basal ice-shelf melt, freshening the surface waters around Antarctica, which leads to increases in sea-ice cover. With climate warming ongoing, future mass-loss rates are projected to accelerate, which has the potential to affect future Antarctic seaice trends. Here we investigate to what extent future sea-ice trends are influenced by projected increases in Antarctic freshwater flux due to subsurface melt, using a state-of-the-art global climate model (EC-Earth) in standardized Climate Model Intercomparison Project phase 5 (CMIP5) climatechange simulations. Virtually all CMIP5 models disregard ocean-ice-sheet interactions and project strongly retreating Antarctic sea ice. Applying various freshwater flux scenarios, we find that the additional fresh water significantly offsets the decline in sea-ice area and is even able to reverse the trend in the strongest freshwater forcing scenario that can reasonably be expected, especially in austral winter. The model also simulates decreasing sea surface temperatures (SSTs), with the SST trends exhibiting strong regional variations that largely correspond to regional sea-ice trends. |
format |
Article in Journal/Newspaper |
author |
Bintanja, R. Van Oldenborgh, G. J. Katsman, C. A. |
spellingShingle |
Bintanja, R. Van Oldenborgh, G. J. Katsman, C. A. The effect of increased fresh water from Antarctic ice shelves on future trends in Antarctic sea ice |
author_facet |
Bintanja, R. Van Oldenborgh, G. J. Katsman, C. A. |
author_sort |
Bintanja, R. |
title |
The effect of increased fresh water from Antarctic ice shelves on future trends in Antarctic sea ice |
title_short |
The effect of increased fresh water from Antarctic ice shelves on future trends in Antarctic sea ice |
title_full |
The effect of increased fresh water from Antarctic ice shelves on future trends in Antarctic sea ice |
title_fullStr |
The effect of increased fresh water from Antarctic ice shelves on future trends in Antarctic sea ice |
title_full_unstemmed |
The effect of increased fresh water from Antarctic ice shelves on future trends in Antarctic sea ice |
title_sort |
effect of increased fresh water from antarctic ice shelves on future trends in antarctic sea ice |
publisher |
Zenodo |
publishDate |
2015 |
url |
https://doi.org/10.3189/2015aog69a001 |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Sea ice |
op_relation |
https://doi.org/10.3189/2015aog69a001 oai:zenodo.org:894061 |
op_rights |
info:eu-repo/semantics/openAccess Other (Open) |
op_doi |
https://doi.org/10.3189/2015aog69a001 |
container_title |
Annals of Glaciology |
container_volume |
56 |
container_issue |
69 |
container_start_page |
120 |
op_container_end_page |
126 |
_version_ |
1810289660760424448 |