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 overturning 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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craaas:10.1126/sciadv.adc9174 2024-09-30T14:26:02+00:00 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 2022 http://dx.doi.org/10.1126/sciadv.adc9174 https://www.science.org/doi/pdf/10.1126/sciadv.adc9174 en eng American Association for the Advancement of Science (AAAS) Science Advances volume 8, issue 42 ISSN 2375-2548 journal-article 2022 craaas https://doi.org/10.1126/sciadv.adc9174 2024-09-05T04:00:48Z Antarctic Bottom Water (AABW) occupies the abyssal layer of the world ocean and contributes to the global overturning 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 AAAS Resource Center (American Association for the Advancement of Science) 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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AAAS Resource Center (American Association for the Advancement of Science) |
op_collection_id |
craaas |
language |
English |
description |
Antarctic Bottom Water (AABW) occupies the abyssal layer of the world ocean and contributes to the global overturning 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 |
spellingShingle |
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 |
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 |
American Association for the Advancement of Science (AAAS) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1126/sciadv.adc9174 https://www.science.org/doi/pdf/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_source |
Science Advances volume 8, issue 42 ISSN 2375-2548 |
op_doi |
https://doi.org/10.1126/sciadv.adc9174 |
container_title |
Science Advances |
container_volume |
8 |
container_issue |
42 |
_version_ |
1811646552393908224 |