台風発生時に活発化する雷活動について

Abstract

Lightning activity is related to the tropical cyclone (TC) intensity. Lightning observation network are deployed over the western north Pacific by five very long frequency events trigger measurements called V-POTEKA under the ULAT (Understanding Lightning and Thunderstorm) of SATREPS (Science and Technology Research Partnership for Sustainable Development) in the Philippines. Lightning activity was drastically increased around the TC during the TC genesis stage. We called this phenomenon as “lightning burst”. About 75% of TCs observed lightning bursts during the TC genesis stage over the Philippine Sea in 2020. Lightning bursts tend to occur when TC generates near the coast of the Philippines. Rich graupel profile environment associated with land-based aerosol will be necessary for lightning bursts and more lightnings in the TCs.