Intermittent Interaction between the ENSO and Indian Ocean: Part Ⅱ. Experimental modeling: Part Ⅱ. Experimental modeling Jong-Seong Kug, Yoo-Geun Ham, In-Sik Kang Abstract: So far, most studies have focused on the impact of ENSO on Indian Ocean (e.g. Klein et al. 1999; Venzke et al. 2000; Xie et al. 2002), while little research devoting has been performed the impact of the Indian Ocean SST on the ENSO. It was very interesting that the coupling between the ENSO and Indian Ocean favors short-time scale relative to the typical ENSO time scale, 3-5 years because the coupling leads rapid phase transition. As shown in Part I, when the warm SST in the eastern Pacific concurs warm SST in the western Indian Ocean, the El Nin is rapidly decayed and developed to La Nina in next year. In Part I of this paper, hypothetical mechanism is suggested for the ENSO and Indian Ocean coupling. The Indian Ocean SST produces wind anomalies in the western Pacific, which influences on ENSO fast transition. Therefore, the ENSO period tends to be shorten when the Indian Ocean and ENSO are coupled. In Part II, the hypothesis is examined by several experimental modeling. These results support the hypothetical mechanism. PDF: P2003_1