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Numerical study of winter water formation in the Chukchi Sea : Roles and impacts of coastal polynyas

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Title: Numerical study of winter water formation in the Chukchi Sea : Roles and impacts of coastal polynyas
Authors: Kawaguchi, Yusuke Browse this author
Tamura, Takeshi Browse this author
Nishino, Shigeto Browse this author
Kikuchi, Takashi Browse this author
Itoh, Motoyo Browse this author
Mitsudera, Humio Browse this author
Issue Date: 28-Jul-2011
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research, Oceans
Volume: 116
Start Page: C07025
Publisher DOI: 10.1029/2010JC006606
Abstract: Winter water formation is examined in the Chukchi Sea for the winters of 1992-2006 using a primitive equation ocean model forced by NCEP wind and surface salinity flux derived from SSM/I thin ice thickness estimates. The model is also forced by an external inflow of 0.8 Sv through the Bering Strait. The model successfully reproduces the oceanic circulation on the Chukchi shelf, thus providing numerous insights into behaviors of salt-enriched water produced on the shelf. The experiments show that under northeasterly winds, northward throughflow across Barrow Canyon is reduced. This results in salinity buildup under freezing conditions and ultimately in greater enhancement of salinity of the waters carried into the Arctic Basin. The flow and salinity enhancement of the flow through Herald Canyon is less extreme but more steady than through Barrow Canyon. Together with moored salinity in the Bering Strait, the model results estimate the actual salinity to be 32.9 ± 0.8 psu and 32.7 ± 0.3 psu, respectively, for waters moving through the Barrow and Herald Canyons. Both estimates are less than 33.1 psu that is typically observed for the cold halostad layer in the Canada Basin, suggesting the importance of diapycnal mixing with saltier Atlantic origin water.
Rights: Copyright 2011 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: 三寺 史夫

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