According to previous studies, the El Niño 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 Niño than during La Niña, 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 Niño compared to La Niña. 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.

Abstract
1. Introduction
2. Data and Method
3. Results
4. Summary and Discussion
Acknowledgments
References

• Doo-Sun R. Park(Department of Earth Science Education, Kyungpook National University, Daegu 41566, South Korea, BK21 Weather Extremes Education & Research Team, Department of Atmospheric Sciences, Kyungpook National University, Daegu 41566, South Korea, Center for Atmospheric REmote sensing (CARE), Kyungpook National University, Daegu 41566, South Korea)
• Chan-Gi Lee(Department of Earth Science Education, Chonnam National University, Gwangju 61186, South Korea)
• Minhee Chang(Environmental Planning Institute, Seoul National University, Seoul 08826, South Korea, Climate Tech Center, Seoul National University, Seoul 08826, South Korea)
• Tae-Won Park(Department of Earth Science Education, Chonnam National University, Gwangju 61186, South Korea) Corresponding author