Dominant frazil ice production in the Cape Darnley polynya leading to Antarctic Bottom Water formation
Antarctic Bottom Water (AABW) occupies the abyssal layer of the world ocean and contributes to the global over-turning circulation. It originates from dense shelf water, which forms from brine rejection during sea ice production. An important region of AABW formation has been identified off the Cape...
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Online Access: | http://hdl.handle.net/2115/87550 https://doi.org/10.1126/sciadv.adc9174 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/87550 2023-05-15T13:58:52+02:00 Dominant frazil ice production in the Cape Darnley polynya leading to Antarctic Bottom Water formation Ohshima, Kay I. Fukamachi, Yasushi Ito, Masato Nakata, Kazuki Simizu, Daisuke Ono, Kazuya Nomura, Daiki Hashida, Gen Tamura, Takeshi http://hdl.handle.net/2115/87550 https://doi.org/10.1126/sciadv.adc9174 eng eng The American Association for the Advancement of Science(AAAS) http://hdl.handle.net/2115/87550 Science advances, 8(42): eadc9174 http://dx.doi.org/10.1126/sciadv.adc9174 452 article fthokunivhus https://doi.org/10.1126/sciadv.adc9174 2022-12-23T01:01:46Z Antarctic Bottom Water (AABW) occupies the abyssal layer of the world ocean and contributes to the global over-turning circulation. It originates from dense shelf water, which forms from brine rejection during sea ice production. An important region of AABW formation has been identified off the Cape Darnley polynya. However, it remains unclear why and how high ice production leads to AABW formation. Using moored acoustic measurements and a satellite microwave algorithm, we reveal that underwater frazil ice dominates in the polynya. This underwater ice formation prevents heat-insulating surface-cover ice forming, thereby enabling efficient ice production. The high ice production in the nearshore and longer residence times create high-salinity source water for the AABW. Underwater frazil ice occurs as long as strong winds continue and occasionally penetrates depths of at least 80 m. Deep-penetrating frazil ice is particularly prominent in this polynya, while it also occurs in other Antarctic coastal polynyas. Article in Journal/Newspaper Antarc* Antarctic Sea ice Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic Cape Darnley ENVELOPE(69.567,69.567,-67.738,-67.738) Darnley ENVELOPE(69.717,69.717,-67.717,-67.717) Science Advances 8 42 |
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Open Polar |
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Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
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fthokunivhus |
language |
English |
topic |
452 |
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452 Ohshima, Kay I. Fukamachi, Yasushi Ito, Masato Nakata, Kazuki Simizu, Daisuke Ono, Kazuya Nomura, Daiki Hashida, Gen Tamura, Takeshi Dominant frazil ice production in the Cape Darnley polynya leading to Antarctic Bottom Water formation |
topic_facet |
452 |
description |
Antarctic Bottom Water (AABW) occupies the abyssal layer of the world ocean and contributes to the global over-turning circulation. It originates from dense shelf water, which forms from brine rejection during sea ice production. An important region of AABW formation has been identified off the Cape Darnley polynya. However, it remains unclear why and how high ice production leads to AABW formation. Using moored acoustic measurements and a satellite microwave algorithm, we reveal that underwater frazil ice dominates in the polynya. This underwater ice formation prevents heat-insulating surface-cover ice forming, thereby enabling efficient ice production. The high ice production in the nearshore and longer residence times create high-salinity source water for the AABW. Underwater frazil ice occurs as long as strong winds continue and occasionally penetrates depths of at least 80 m. Deep-penetrating frazil ice is particularly prominent in this polynya, while it also occurs in other Antarctic coastal polynyas. |
format |
Article in Journal/Newspaper |
author |
Ohshima, Kay I. Fukamachi, Yasushi Ito, Masato Nakata, Kazuki Simizu, Daisuke Ono, Kazuya Nomura, Daiki Hashida, Gen Tamura, Takeshi |
author_facet |
Ohshima, Kay I. Fukamachi, Yasushi Ito, Masato Nakata, Kazuki Simizu, Daisuke Ono, Kazuya Nomura, Daiki Hashida, Gen Tamura, Takeshi |
author_sort |
Ohshima, Kay I. |
title |
Dominant frazil ice production in the Cape Darnley polynya leading to Antarctic Bottom Water formation |
title_short |
Dominant frazil ice production in the Cape Darnley polynya leading to Antarctic Bottom Water formation |
title_full |
Dominant frazil ice production in the Cape Darnley polynya leading to Antarctic Bottom Water formation |
title_fullStr |
Dominant frazil ice production in the Cape Darnley polynya leading to Antarctic Bottom Water formation |
title_full_unstemmed |
Dominant frazil ice production in the Cape Darnley polynya leading to Antarctic Bottom Water formation |
title_sort |
dominant frazil ice production in the cape darnley polynya leading to antarctic bottom water formation |
publisher |
The American Association for the Advancement of Science(AAAS) |
url |
http://hdl.handle.net/2115/87550 https://doi.org/10.1126/sciadv.adc9174 |
long_lat |
ENVELOPE(69.567,69.567,-67.738,-67.738) ENVELOPE(69.717,69.717,-67.717,-67.717) |
geographic |
Antarctic Cape Darnley Darnley |
geographic_facet |
Antarctic Cape Darnley Darnley |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_relation |
http://hdl.handle.net/2115/87550 Science advances, 8(42): eadc9174 http://dx.doi.org/10.1126/sciadv.adc9174 |
op_doi |
https://doi.org/10.1126/sciadv.adc9174 |
container_title |
Science Advances |
container_volume |
8 |
container_issue |
42 |
_version_ |
1766267239438221312 |