Weiming Sha and Guixing Chen Tohoku University, Japan 1st MAHASRI/AMY WS Yokohama/Tokyo, 2007.1.8-10 Study on Monsoon Onset in South China (Huanan area)

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Weiming Sha and Guixing Chen Tohoku University, Japan 1st MAHASRI/AMY WS Yokohama/Tokyo, Study on Monsoon Onset in South China (Huanan area) with a High-resolution Regional Weather Forecast Model System

Beginning date of rainy season (a) subtropical monsoon onset; (b) after tropical monsoon onset (Chen et al, Cli. Envi. Res., 2000) month pentad Aug Jul Jun May Apr

Heavy flood over South China in June 2005 AWS accumulative precipitation(mm) during 17~26 Jun, 2005

Diurnal variation of the rainfall in coastal region (mm/hr.)

Target/Task Monsoon onset events in South China (Huanan area) Modeling, Understanding & Prediction

DS: a ‘ small ’ JMA DS 3 : a ‘ small ’ JMA JMA DS 3 Model/Resolution Global model ( dx=40km ) NHM model (dx=15km→4km→1km) Regional model ( dx=20km ) Coupled with Meso model ( dx=5km ) CFD ・ LES model (dx ~ 100m ) Its name is ・・・ DS 3 = Down Scaling Simulation System We are building up and testing A high-resolution regional weather forecast model system

*Modeling and validation of the monsoon onset events, diurnal variation of the rainfall in Huanan area, South China (on going,,,) Next … *Understanding its mechanism and prediction