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Dominant frazil ice production in the Cape Darnley polynya leading to Antarctic Bottom Water formation

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Title: Dominant frazil ice production in the Cape Darnley polynya leading to Antarctic Bottom Water formation
Authors: Ohshima, Kay I. Browse this author →KAKEN DB
Fukamachi, Yasushi Browse this author
Ito, Masato Browse this author
Nakata, Kazuki Browse this author
Simizu, Daisuke Browse this author
Ono, Kazuya Browse this author →KAKEN DB
Nomura, Daiki Browse this author
Hashida, Gen Browse this author
Tamura, Takeshi Browse this author
Issue Date: 19-Oct-2022
Publisher: The American Association for the Advancement of Science(AAAS)
Journal Title: Science advances
Volume: 8
Issue: 42
Start Page: eadc9174
Publisher DOI: 10.1126/sciadv.adc9174
Abstract: 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.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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