JpGU-AGU Joint Meeting 2017

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[EJ] Oral

A (Atmospheric and Hydrospheric Sciences) » A-OS Ocean Sciences & Ocean Environment

[A-OS29] [EJ] Dynamics of oceanic and atmospheric waves, vortices, and circulations

Tue. May 23, 2017 10:45 AM - 12:15 PM 302 (International Conference Hall 3F)

convener:Ryo Furue(APL/JAMSTEC), Yukiharu Hisaki(Faculty of Science, University of the Ryukyus), Humio Mitsudera(Institute of Low Temperature Science, Hokkaido University), Norihiko Sugimoto(Keio University, Department of Physics), Chairperson:Yukiharu Hisaki(Faculty of Science, University of the Ryukyus), Chairperson:Norihiko Sugimoto(Keio University, Department of Physics), Chairperson:Hideyuki Nakano(Meteorological Research Institute)

11:15 AM - 11:30 AM

[AOS29-09] Near-inertial Gyroscopic Wave in the Bottom-layer Water of the Japan sea

*Umihiko Ito1, Yutaka Isoda1, Tomoharu Senjyu (1.Hokkaido University Graduate School of Fisheries Sciences)

Keywords:horizontal component of Coriolis parameter, Near-inertial frequency, Gyroscopic Wave, Bottom-layer Water

We focus on a behavior of near-inertial Gyroscopic Wave (GsW) in the vertical homogeneous Bottom-layer Water (BW) with N~0 (N is the buoyancy frequency) in the abyssal Japan Sea. Whether a near-inertial internal wave/GsW can intrude into the BW or not, depend on its direction of propagation from east-westward to southward. When a near-inertial GsW reflects at the sea bottom, its vertical wavenumber largely changes from low to high. Therefore, the reflected GsW propagates as creeping along the sea bottom. It is inferred that such GsW might contribute to vertical mixing within the BW.