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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第66巻 第3号 >


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Title: 北太平洋風成循環流の季節変化に関する数値モデル実験
Other Titles: Numerical model experiments for seasonal variation of North Pacific wind-driven circulation
Authors: 舘野, 愛実 Browse this author
藤原, 将平 Browse this author
磯田, 豊 Browse this author →KAKEN DB
朝日, 啓二郎 Browse this author
Keywords: wind-driven circulation
two-layer model
seasonal variation
barotropic and baroclinic response
Issue Date: 27-Dec-2016
Publisher: 北海道大学大学院水産科学研究院
Journal Title: 北海道大学水産科学研究彙報
Volume: 66
Issue: 3
Start Page: 87
End Page: 97
Abstract: A two-layer model ocean with Izu-Ogasawara Ridge(IOR) and the Emperor Seamounts(ESs), driven by seasonally varying wind stress, is used to explain the observed seasonal variations of barotropic and baroclinic response in the North Pacific. Since isostasy is achieved for annual mean state, the annually averaged subarctic and subtropical surface gyres are separated without any bathymetric influence. For a short time scale such as seasonal variation, the barotropic flow is inhibited from ascending the bottom slope because of the restriction of the potential vorticity conservation, and generates the baroclinic Annual Rossby Waves(ARW) through the impinging process on the shelf slope. The most conspicuous feature in barotropic response is the southward invasion of the subarctic anti-clockwise circulation strengthened in winter into the subtropical region along the IOR and the western shelf slope. It is also found that the westward propagating baroclinic ARW from the southern ESs is appeared to be enhanced in spring by superimposing on the seasonal change of Ekman pumping. These model results are consistent with those estimatied from the observation.
Type: bulletin (article)
Appears in Collections:北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第66巻 第3号

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