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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第60巻 第2/3号 >


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Title: 高次モード陸棚波の励起
Other Titles: Generation of Higher Mode Shelf Waves
Authors: 磯田, 豊1 Browse this author →KAKEN DB
磯貝, 安洋2 Browse this author
Authors(alt): Isoya, Yutaka1
Isogai, Yasuhiro2
Keywords: shelf waves
vortex eddies
conservation of potential vorticity
scattering process
Issue Date: Dec-2010
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
Journal Title(alt): Bulletin of Fisheries Sciences, Hokkaido University
Volume: 60
Issue: 2/3
Start Page: 39
End Page: 49
Abstract: Shelf waves have many modal-dependent structures in their cross-shelf dimension. The current fluctuations on the shelf areas in the world oceans were frequently dominated by the second or third mode. Theoretical studies show that all mode waves excited within the wind forcing area starts propagating after the sudden onset of forcing. Thus,the generation of higher-mode waves can be predicted theoretically,but intuitive understanding for its physical mechanism is not easy. This study suggests that modal-dependent structures are temporally formed as regarded as the scattering process of vortex eddies. The scattering gives repeated rise to an eddy with positive/ negative vorticity generated by a former-formed eddy with opposite-sign vorticity,according to the conservation of potential vorticity.
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60巻 第2/3号

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