JpGU-AGU Joint Meeting 2017

Presentation information

[EJ] Poster

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 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall HALL7)

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)

[AOS29-P04] On the seasonal variation of the Bering Slope Current and anticyclonic eddies

*Humio Mitsudera1, Youichi Hirano2 (1.Institute of Low Temperature Science, Hokkaido University, 2.Graduate School of Environmental Science)

Keywords:Bering Slope Current, eddies, seasonal variation

The Bering Slope Current (BSC) flows along the continental slope between the broad continental shelf and the deep basin in the Bering Sea. In this study, we consider the seasonal variability of the BSC and associated eddies by using a high-resolution model output. The BSC is strong (weak) in winter (summer), when isopycnal surfaces deepens (shoals) through the propagation of coastally trapped waves. The eddies are generated as a result of baroclinic instrability when the BSC is strengthened, extracting potential energy from the BSC. The seasonality of the BSC, as well as the eddies, is controlled by the seasonal variation of the Alaskan Stream via coastally trapped waves, generation of which is attributed to the seasonal variation of winds along the Alaskan coast.