JpGU-AGU Joint Meeting 2020

Presentation information

[E] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS10] Land-Atmosphere interactions and precipitation variations over the Asian monsoon region.

convener:Hiroshi G. Takahashi(Department of Geography, Tokyo Metropolitan University), Hirokazu Endo(Meteorological Research Institute, Japan Meteorological Agency), Shiori Sugimoto(JAMSTEC Japan Agency for Marine-Earth Science and Technology), Hatsuki Fujinami(Nagoya University)

[AAS10-02] Warm-Season Convection Initiation in South China

*Lanqiang Bai1, Guixing Chen1, Ling Huang2 (1.Sun Yat-sen University, 2.ITMM, CMA)

Keywords:Convection initiation, Monsoon, Coast, South China

A large fraction of global rainfall occurs in the coastal areas of summer monsoon where are highly populated. Characterizing convective activity along monsoon coasts has been an important issue in regional/global climate and hydrological studies. In this study, we present a long-term radar climatology of convection initiation (CI) on the monsoon coasts of South China where has dense observational networks. Results show that CI becomes highly active after the summer monsoon onset. Most CI occurrences are concentrated within 100 km of the coastline, and the local maxima are strongly affected by topography and land–sea contrast. The triggering of coastal convention shows offshore propagation after midnight prior to rainfall, probably due to the convergence of land breezes or downslope winds with diurnally enhanced onshore monsoon flows. The findings provide key information to improve our understanding of how convective activity emerges in monsoon coastal areas.