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第69巻 第1号 >

日本海深層Bottom Water内におけるGyroscopic Waveの3波共鳴

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Title: 日本海深層Bottom Water内におけるGyroscopic Waveの3波共鳴
Other Titles: Nonlinearly Interacting Triad of Gyroscopic Waves at the Bottom Water in the Japan Sea
Authors: 伊藤, 海彦1 Browse this author
磯田, 豊2 Browse this author →KAKEN DB
千手, 智晴3 Browse this author →KAKEN DB
Authors(alt): Itoh, Umihiko1
Isoda, Yutaka2
Senjyu, Tomoharu3
Keywords: Japan Sea
Bottom Water
gyroscopic waves
nonlinearly interacting triad
Issue Date: 7-Aug-2019
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: 69
Issue: 1
Start Page: 1
End Page: 17
Abstract: We focus on the motions at frequencies close to the local inertial frequency (fs ; vertical component of the Earth’s rotation), i.e., near-inertial waves, at the great depths (> 2500 m) in the Japan Sea. In this confined basin, deep stratification is very weak, especially buoyancy frequency N~0 at the Bottom Water (BW) where the horizontal component of the Earth’s rotation (fc) vector becomes more important for the generation of gyroscopic waves (GsW). The combined effect of both fs and fc is called ‘non-traditional’ effect for linear internal waves. At first, we review that non-traditional effects change the dynamics of near-inertial waves through our original physical interpretation. Its effect is also shown to enable an irreversible transformation of vertical low-wavenumber into vertical high-wavenumber in the BW, when southward propagating near-inertial GsW reflects at the sea bottom. Such transition suggests the predominant near-inertial oscillation of vertical shear currents, which may provide new mechanism for effective mixing in the BW. In later section, as one of the candidates for vertical mixing process, ‘nonlinearly interacting triad of GsW’ is studied in the framework of a fully nonlinear non-hydrostatic numerical model.
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69巻 第1号

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