Ice-Band Pattern Formation caused by Resonant Interaction between Sea-Ice Drift and Internal-Wave Propagation

Saiki Ryu, Mitsudera Humio, Fujisaki-Manome Ayumi, Kimura Noriaki, Ukita Jinro, Toyota Takenobu, Nakamura Tomohiro

doi:10.14943/lowtemsci.82.195

Signals of the global climate change may be easy to appear around the ice-edge area, because melting and refreezing are often occurred in such field. Ice-band pattern formation is a phenomenon in the ice-edge area. Ice-band patterns have two basic features, one is the regular size (about 10km) band-spacing to the short axis direction of ice-band pattern, another is suitable wind direction which is slightly turn to the counterclockwise with respect to the perpendicular to the long axis of ice-band pattern. However, there have been no certain explanation about two basic characters. Thus, we try to examine from a point of view of the resonant-interaction between sea-ice drift and internal-wave propagation using 1.5-layer simple theoretical model. In consequence, we confirm that our theoretical results associated with two basic features correspond with the results of numerical experiments and satellite observation data. Further, we found that the resonance mode is necessary to be shifted with respect to the wind speed change in a continuously stratification case.

Ice-Band Pattern Formation caused by Resonant Interaction between Sea-Ice Drift and Internal-Wave Propagation

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