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Warm surface waters increase Antarctic ice shelf melt and delay dense water formation

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Title: Warm surface waters increase Antarctic ice shelf melt and delay dense water formation
Authors: Aoki, Shigeru Browse this author →KAKEN DB
Takahashi, Tomoki Browse this author
Yamazaki, Kaihe Browse this author
Hirano, Daisuke Browse this author
Ono, Kazuya Browse this author →KAKEN DB
Kusahara, Kazuya Browse this author
Tamura, Takeshi Browse this author
Williams, Guy D. Browse this author
Issue Date: 22-Jun-2022
Publisher: Springer Nature
Journal Title: Communications Earth & Environment
Volume: 3
Start Page: 142
Publisher DOI: 10.1038/s43247-022-00456-z
Abstract: Melting ice shelves around Antarctica control the massive input of freshwater into the ocean and play an intricate role in global heat redistribution. The Amery Ice Shelf regulates wintertime sea-ice growth and dense shelf water formation. We investigated the role of warm Antarctic Surface Water in ice shelf melting and its impact on dense shelf water. Here we show that the coastal ocean in summer 2016/17 was almost sea-ice free, leading to higher surface water temperatures. The glacial meltwater fraction in surface water was the highest on record, hypothesised to be attributable to anomalous ice shelf melting. The excess heat and freshwater in early 2017 delayed the seasonal evolution of dense shelf water. Focused on ice shelf melting at depth, the importance and impacts of warming surface waters has been overlooked. In a warming climate, increased surface water heating will reduce coastal sea-ice production and potentially Antarctic Bottom Water formation. Excessively warm and fresh surface water along the Amery Ice Shelf, Antarctica, in 2017 led to more ice melt and delayed dense water formation, according to analyses of in situ observations.
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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