黑潮與颱風交互作用及黑潮流域中尺度運動之研究(Ⅲ)

In this study, a coupled ocean-atmosphere-wave-sediment transport (COAWST) model was used to simulate the evolution of Typhoon Nanmadol (2011), an intense typhoon that strolling over the Kuroshio near two days, making twice landfall on both Philippines and Taiwan. Sensitivity experiments with different configurations of air-sea coupling complexities were performed to elucidate the importance of coupling on the simulations of typhoon intensities and tracks changes and the influence of the three-dimensional ocean structure on the development of typhoons, with a focus on the interaction between the typhoon and the Kuroshio in the Luzon Strait and the unique path of Nanmadol. Our results indicate that the typhoon intensity decreased as it passed over warm Kuroshio, which is counter to statements by previous studies. Dynamic analysis shows that an unexpected cooling associated with change in momentum balance of frontal structure in the Luzon Strait occurred and significantly reduced intensity of Nanmadol. The results shown in this study shed light on the importance of proper cooperating between oceanic and atmospheric frames by air-sea coupled model for providing a better typhoon intensity change simulation while it across an active Kuroshio.