Japan Geoscience Union Meeting 2019

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[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-CG Complex & General

[A-CG38] Multi-scale ocean-atmosphere interaction in the tropical Indo-Pacific region

Tue. May 28, 2019 10:45 AM - 12:15 PM 104 (1F)

convener:Ayako Seiki(Japan Agency for Marine-Earth Science and Technology), Tomoki Tozuka(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Motoki Nagura(Japan Agency for Marine-Earth Science and Technology), Youichi Kamae(Faculty of Life and Environmental Sciences, University of Tsukuba), Chairperson:Tomoki Tozuka(The University of Tokyo), Youichi Kamae(University of Tsukuba)

12:00 PM - 12:15 PM

[ACG38-12] The impact of diurnal precipitation over the maritime continent on synoptic disturbances and its relation to the MJO

*Ayako Seiki1, Satoru Yokoi1, Masaki Katsumata1, Kunio Yoneyama1 (1.Japan Agency for Marine-Earth Science and Technology)

Keywords:diurnal precipitation, the maritime continent, synoptic disturbances

Diurnal cycle has been known to contribute to a significant amount of precipitation over the maritime continent. In this study, the impact of diurnal precipitation over Sumatra Island, the Indonesian maritime continent, on synoptic disturbances over the surrounding ocean, especially the eastern Indian Ocean, is examined using the Global Satellite Mapping of Precipitation (GSMaP) data. High precipitation area observed over Sumatra in afternoon migrates offshore during night-time and reaches 500 km off the coast in average. Synoptic disturbances represented by eddy kinetic energy are enhanced south of the equator off Sumatra when the diurnal precipitation is strong, then they migrate poleward with cyclonic structures over the eastern Indian Ocean. These results suggest that the diurnal precipitation over Sumatra can excite synoptic disturbances over the eastern Indian Ocean.