Summer and Autumn Tropical Cyclone Activity over Korea Responds in Opposite Ways to ENSO Phases

초록

According to previous studies, the El Ni & ntilde;o Southern Oscillation (ENSO) does not appear to regulate TC activity over Korea. By dividing the TC season into two sub-seasons, i.e. summer and autumn, we found the opposite response of TC activity over Korea to ENSO phases between the sub-seasons. In summer, about 1.2 more TCs affect Korea during El Ni & ntilde;o than during La Ni & ntilde;a, while about 1.2 fewer TCs do so in autumn. The opposite responses to ENSO could reduce the statistical significance of the relationship between ENSO and TC activity over Korea when the entire TC season (July to October) is considered. In summer, the southerly anomaly over the southern sea of the Korean peninsula due to the eastward retreating subtropical high allows a greater number of TCs to approach Korea during El Ni & ntilde;o compared to La Ni & ntilde;a. On the other hand, in autumn, the northwesterly anomaly due to the westward extension of the subtropical high leads to a smaller number of TC approaches.

키워드