15:45 〜 16:00
[MIS09-02] Lightning activity around the tropical cyclone depending on the distance from the land
キーワード：台風、雷、フィリピン海
The accuracy of tropical cyclone (TC) track forecast has been improved year by years, on the other hand, the forecast of tropical cyclone intensity still has a difficulty of improvement. Recently the relationship between lightning activity and tropical cyclone intensity has been investigated. Lightning tends to increase during the rapid intensification of the TC. Therefore, monitoring the lightning activity becomes important for a TC intensity forecast. Lightning observation network are deployed over the western north Pacific by five very long frequency events trigger measurements called V-POTEKA at Palau, Guam, Manila, Okinawa Japan and Serpong Indonesia 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 over the western north Pacific. Numbers of lightning reached the maximum during the life cycle of the TC. We called this phenomenon as “lightning burst”. It indicates that it will be a signal for a TC genesis when lightning burst occurred in the tropical disturbances. On the other hand, when TC generated far from Philippines over the open ocean, lightning activity was weak and lightning burst did not occur around the TC. The environment of land-based aerosol may be necessary for more lightnings in the TCs and the lightning bursts. We will discuss what kind of structure occurred during the lightning burst and what kind of mechanism responsible for the lightning around the TC.
Lightning activity was drastically increased around the TC during the TC genesis stage over the western north Pacific. Numbers of lightning reached the maximum during the life cycle of the TC. We called this phenomenon as “lightning burst”. It indicates that it will be a signal for a TC genesis when lightning burst occurred in the tropical disturbances. On the other hand, when TC generated far from Philippines over the open ocean, lightning activity was weak and lightning burst did not occur around the TC. The environment of land-based aerosol may be necessary for more lightnings in the TCs and the lightning bursts. We will discuss what kind of structure occurred during the lightning burst and what kind of mechanism responsible for the lightning around the TC.