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Winter Water Formation in Coastal Polynyas of the Eastern Chukchi Shelf: Pacific and Atlantic Influences

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Title: Winter Water Formation in Coastal Polynyas of the Eastern Chukchi Shelf: Pacific and Atlantic Influences
Authors: Hirano, Daisuke Browse this author
Fukamachi, Yasushi Browse this author →KAKEN DB
Ohshima, Kay, I Browse this author
Watanabe, Eiji Browse this author
Mahoney, Andrew R. Browse this author
Eicken, Hajo Browse this author
Itoh, Motoyo Browse this author
Simizu, Daisuke Browse this author
Iwamoto, Katsushi Browse this author
Jones, Joshua Browse this author
Takatsuka, Toru Browse this author
Kikuchi, Takashi Browse this author
Tamura, Takeshi Browse this author
Keywords: Alaskan Coastal Winter Water
hybrid coastal polynya
sea-ice production
ocean heat flux
Chukchi Sea
Issue Date: 17-Aug-2018
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research: Oceans
Volume: 123
Issue: 8
Start Page: 5688
End Page: 5705
Publisher DOI: 10.1029/2017JC013307
Abstract: Water properties and formation processes of Alaskan Coastal Winter Water (ACWW) over the eastern Chukchi shelf along the Alaska coast, the so-called Barrow Canyon pathway, are examined using data from moorings, atmospheric reanalysis, satellite-derived sea-ice production (SIP), and a numerical tracer experiment. Along this pathway, Pacific Winter Water (PWW) can be modified to produce ACWW through SIP accompanied by production of cold, saline polynya water in the coastal polynyas, upwelling of warm Atlantic Water (AW), and mixing processes on the shelf. Three different types of ACWW are formed: (i) a mixture of AW and PWW, (ii) a mixture of AW and polynya water, and (iii) hypersaline polynya water. The northeasterly winds, correlated with the north-south atmospheric pressure gradient between Beaufort High and Aleutian Low, are common triggers of polynya SIP episodes and AW upwelling in the Barrow Coastal Polynya (BCP). Due to the dual impact of northeasterly winds, PWW modification processes in the BCP are more complicated than what occurs elsewhere in the Chukchi Polynya. The impact of AW upwelling on the ACWW formation is most prominent in the BCP, usually centered along the coast. All types of ACWW are thought to be basically transported westward or northwestward with the Chukchi slope current and/or Beaufort Gyre and finally contribute to maintenance of the lower halocline layer especially over the Chukchi Borderland, Northwind Ridge, and southern Canada Basin. Even in the Pacific sector of the Arctic Ocean, ACWW properties are strongly influenced by both Atlantic-origin and Pacific-origin waters.
Rights: Copyright 2018 American Geophysical Union.
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)

Submitter: 平野 大輔

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