The land-sea breeze circulation system in Ulsan seems to be very complicated due to the complex topography. In this study, the influent of land-sea breezes on the levels of CAPs is briefly discussed in the follow sections. We are currently investigating land-sea breeze circulations in Ulsan with observation and simulation of wind fields. Therefore, an in-depth discussion on the land-sea breeze is out of the scope of the present study.