Freshening by glacial meltwater enhances melting of ice shelves and reduces formation of Antarctic Bottom Water
Silvano, A., Rintoul, S. R., Pena-Molino, B., Hobbs, W. R., van Wijk, E., Aoki, S., Tamura, T., Williams, G. D.
American Association for the Advancement of Science (AAAS)
Published 2018
American Association for the Advancement of Science (AAAS)
Published 2018
| Publication Date: |
2018-04-19
|
|---|---|
| Publisher: |
American Association for the Advancement of Science (AAAS)
|
| Electronic ISSN: |
2375-2548
|
| Topics: |
Natural Sciences in General
|
| Published by: |
| _version_ | 1836398902008348672 |
|---|---|
| autor | Silvano, A., Rintoul, S. R., Pena-Molino, B., Hobbs, W. R., van Wijk, E., Aoki, S., Tamura, T., Williams, G. D. |
| beschreibung | Strong heat loss and brine release during sea ice formation in coastal polynyas act to cool and salinify waters on the Antarctic continental shelf. Polynya activity thus both limits the ocean heat flux to the Antarctic Ice Sheet and promotes formation of Dense Shelf Water (DSW), the precursor to Antarctic Bottom Water. However, despite the presence of strong polynyas, DSW is not formed on the Sabrina Coast in East Antarctica and in the Amundsen Sea in West Antarctica. Using a simple ocean model driven by observed forcing, we show that freshwater input from basal melt of ice shelves partially offsets the salt flux by sea ice formation in polynyas found in both regions, preventing full-depth convection and formation of DSW. In the absence of deep convection, warm water that reaches the continental shelf in the bottom layer does not lose much heat to the atmosphere and is thus available to drive the rapid basal melt observed at the Totten Ice Shelf on the Sabrina Coast and at the Dotson and Getz ice shelves in the Amundsen Sea. Our results suggest that increased glacial meltwater input in a warming climate will both reduce Antarctic Bottom Water formation and trigger increased mass loss from the Antarctic Ice Sheet, with consequences for the global overturning circulation and sea level rise. |
| citation_standardnr | 6240523 |
| datenlieferant | ipn_articles |
| feed_id | 228416 |
| feed_publisher | American Association for the Advancement of Science (AAAS) |
| feed_publisher_url | http://www.aaas.org/ |
| insertion_date | 2018-04-19 |
| journaleissn | 2375-2548 |
| publikationsjahr_anzeige | 2018 |
| publikationsjahr_facette | 2018 |
| publikationsjahr_intervall | 7984:2015-2019 |
| publikationsjahr_sort | 2018 |
| publisher | American Association for the Advancement of Science (AAAS) |
| quelle | Science Advances |
| relation | http://advances.sciencemag.org/cgi/content/short/4/4/eaap9467?rss=1 |
| search_space | articles |
| shingle_author_1 | Silvano, A., Rintoul, S. R., Pena-Molino, B., Hobbs, W. R., van Wijk, E., Aoki, S., Tamura, T., Williams, G. D. |
| shingle_author_2 | Silvano, A., Rintoul, S. R., Pena-Molino, B., Hobbs, W. R., van Wijk, E., Aoki, S., Tamura, T., Williams, G. D. |
| shingle_author_3 | Silvano, A., Rintoul, S. R., Pena-Molino, B., Hobbs, W. R., van Wijk, E., Aoki, S., Tamura, T., Williams, G. D. |
| shingle_author_4 | Silvano, A., Rintoul, S. R., Pena-Molino, B., Hobbs, W. R., van Wijk, E., Aoki, S., Tamura, T., Williams, G. D. |
| shingle_catch_all_1 | Freshening by glacial meltwater enhances melting of ice shelves and reduces formation of Antarctic Bottom Water Strong heat loss and brine release during sea ice formation in coastal polynyas act to cool and salinify waters on the Antarctic continental shelf. Polynya activity thus both limits the ocean heat flux to the Antarctic Ice Sheet and promotes formation of Dense Shelf Water (DSW), the precursor to Antarctic Bottom Water. However, despite the presence of strong polynyas, DSW is not formed on the Sabrina Coast in East Antarctica and in the Amundsen Sea in West Antarctica. Using a simple ocean model driven by observed forcing, we show that freshwater input from basal melt of ice shelves partially offsets the salt flux by sea ice formation in polynyas found in both regions, preventing full-depth convection and formation of DSW. In the absence of deep convection, warm water that reaches the continental shelf in the bottom layer does not lose much heat to the atmosphere and is thus available to drive the rapid basal melt observed at the Totten Ice Shelf on the Sabrina Coast and at the Dotson and Getz ice shelves in the Amundsen Sea. Our results suggest that increased glacial meltwater input in a warming climate will both reduce Antarctic Bottom Water formation and trigger increased mass loss from the Antarctic Ice Sheet, with consequences for the global overturning circulation and sea level rise. Silvano, A., Rintoul, S. R., Pena-Molino, B., Hobbs, W. R., van Wijk, E., Aoki, S., Tamura, T., Williams, G. D. American Association for the Advancement of Science (AAAS) 2375-2548 23752548 |
| shingle_catch_all_2 | Freshening by glacial meltwater enhances melting of ice shelves and reduces formation of Antarctic Bottom Water Strong heat loss and brine release during sea ice formation in coastal polynyas act to cool and salinify waters on the Antarctic continental shelf. Polynya activity thus both limits the ocean heat flux to the Antarctic Ice Sheet and promotes formation of Dense Shelf Water (DSW), the precursor to Antarctic Bottom Water. However, despite the presence of strong polynyas, DSW is not formed on the Sabrina Coast in East Antarctica and in the Amundsen Sea in West Antarctica. Using a simple ocean model driven by observed forcing, we show that freshwater input from basal melt of ice shelves partially offsets the salt flux by sea ice formation in polynyas found in both regions, preventing full-depth convection and formation of DSW. In the absence of deep convection, warm water that reaches the continental shelf in the bottom layer does not lose much heat to the atmosphere and is thus available to drive the rapid basal melt observed at the Totten Ice Shelf on the Sabrina Coast and at the Dotson and Getz ice shelves in the Amundsen Sea. Our results suggest that increased glacial meltwater input in a warming climate will both reduce Antarctic Bottom Water formation and trigger increased mass loss from the Antarctic Ice Sheet, with consequences for the global overturning circulation and sea level rise. Silvano, A., Rintoul, S. R., Pena-Molino, B., Hobbs, W. R., van Wijk, E., Aoki, S., Tamura, T., Williams, G. D. American Association for the Advancement of Science (AAAS) 2375-2548 23752548 |
| shingle_catch_all_3 | Freshening by glacial meltwater enhances melting of ice shelves and reduces formation of Antarctic Bottom Water Strong heat loss and brine release during sea ice formation in coastal polynyas act to cool and salinify waters on the Antarctic continental shelf. Polynya activity thus both limits the ocean heat flux to the Antarctic Ice Sheet and promotes formation of Dense Shelf Water (DSW), the precursor to Antarctic Bottom Water. However, despite the presence of strong polynyas, DSW is not formed on the Sabrina Coast in East Antarctica and in the Amundsen Sea in West Antarctica. Using a simple ocean model driven by observed forcing, we show that freshwater input from basal melt of ice shelves partially offsets the salt flux by sea ice formation in polynyas found in both regions, preventing full-depth convection and formation of DSW. In the absence of deep convection, warm water that reaches the continental shelf in the bottom layer does not lose much heat to the atmosphere and is thus available to drive the rapid basal melt observed at the Totten Ice Shelf on the Sabrina Coast and at the Dotson and Getz ice shelves in the Amundsen Sea. Our results suggest that increased glacial meltwater input in a warming climate will both reduce Antarctic Bottom Water formation and trigger increased mass loss from the Antarctic Ice Sheet, with consequences for the global overturning circulation and sea level rise. Silvano, A., Rintoul, S. R., Pena-Molino, B., Hobbs, W. R., van Wijk, E., Aoki, S., Tamura, T., Williams, G. D. American Association for the Advancement of Science (AAAS) 2375-2548 23752548 |
| shingle_catch_all_4 | Freshening by glacial meltwater enhances melting of ice shelves and reduces formation of Antarctic Bottom Water Strong heat loss and brine release during sea ice formation in coastal polynyas act to cool and salinify waters on the Antarctic continental shelf. Polynya activity thus both limits the ocean heat flux to the Antarctic Ice Sheet and promotes formation of Dense Shelf Water (DSW), the precursor to Antarctic Bottom Water. However, despite the presence of strong polynyas, DSW is not formed on the Sabrina Coast in East Antarctica and in the Amundsen Sea in West Antarctica. Using a simple ocean model driven by observed forcing, we show that freshwater input from basal melt of ice shelves partially offsets the salt flux by sea ice formation in polynyas found in both regions, preventing full-depth convection and formation of DSW. In the absence of deep convection, warm water that reaches the continental shelf in the bottom layer does not lose much heat to the atmosphere and is thus available to drive the rapid basal melt observed at the Totten Ice Shelf on the Sabrina Coast and at the Dotson and Getz ice shelves in the Amundsen Sea. Our results suggest that increased glacial meltwater input in a warming climate will both reduce Antarctic Bottom Water formation and trigger increased mass loss from the Antarctic Ice Sheet, with consequences for the global overturning circulation and sea level rise. Silvano, A., Rintoul, S. R., Pena-Molino, B., Hobbs, W. R., van Wijk, E., Aoki, S., Tamura, T., Williams, G. D. American Association for the Advancement of Science (AAAS) 2375-2548 23752548 |
| shingle_title_1 | Freshening by glacial meltwater enhances melting of ice shelves and reduces formation of Antarctic Bottom Water |
| shingle_title_2 | Freshening by glacial meltwater enhances melting of ice shelves and reduces formation of Antarctic Bottom Water |
| shingle_title_3 | Freshening by glacial meltwater enhances melting of ice shelves and reduces formation of Antarctic Bottom Water |
| shingle_title_4 | Freshening by glacial meltwater enhances melting of ice shelves and reduces formation of Antarctic Bottom Water |
| timestamp | 2025-06-30T23:34:27.180Z |
| titel | Freshening by glacial meltwater enhances melting of ice shelves and reduces formation of Antarctic Bottom Water |
| titel_suche | Freshening by glacial meltwater enhances melting of ice shelves and reduces formation of Antarctic Bottom Water |
| topic | TA-TD |
| uid | ipn_articles_6240523 |