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EXPERIMENTS ON ASSIMILATION OF INITIAL VALUES IN NUMERICAL PREDICTION OF A WARM-SECTOR PRECIPITATION IN SOUTH CHINA
In order to understand the impact of initial conditions upon prediction accuracy of short-term forecast and nowcast of precipitation in South China,four experiments i.e. a control,an assimilation of conventional sounding and surthce data,testing with nudging rainwater data and the assimilation of radar-derived radial wind,are respectively conducted to simulate a case of warm-sector heavy rainfall that occurred over South China,by using the GRAPES MESO model. The results show that (I) assimilating conventional surface and sounding observations helps improve the 24-h rainfall forecast in both the area and order of magnitude; (2) nudging rainwater contributes to a significant improvement of nowcast,and (3)the assimilation of radar-derived radial winds distinctly improves the 24-h rainfall forecast in both the area and order of magnitude. These results serve as signiticant technical reference for the study on short-term forecast and nowcast of precipitation over South China in the thture.
作 者： ZHANG Cheng-zhong WAN Qi-lin HUANG Yan-yan CHEN Zi-tong DING Wei-yu 作者单位： Guangzhou Institute of Tropical and Marine Meteorology,CMA,Guangzhou 510080 China 刊 名： 热带气象学报(英文版) 英文刊名： JOURNAL OF TROPICAL METEOROLOGY 年，卷(期)： 2009 15(1) 分类号： P435 关键词： South China initial conditions warm-sector precipitation numerical simulation experiment