| dc.description.abstract | We can partition precipitation into stratiform and convective components by their spatial and temporal characteristics. General speaking, the significant features of stratiform precipitation include larger rainfall area, longer period, and vigorous vertical convection. On the contrary, the characteristics of convective precipitation are smaller rainfall area, shorter period, and weakly vertical convection. The convective regions of precipitation locally scatter inside the stratiform regions, and the radar echo of convective precipitation is evidently stronger than the background echo. The stratiform regions of precipitation distribute around the convective regions, and the area of stratiform region is generally bigger than convective regions.
The purpose of this study is to analyze the precipitation data in Taiwan by the precipitation separation scheme of Steiner et al. (1995), Yang and Houze (1995), and Tremblay (2005). Six precipitation events in 2004—spring rainfall, Mei-Yu front, Typhoon Mindulle, the southwesterly flow triggered by Typhoon Mindulle, summer thunderstorm, and autumn cold front—were selected. We found that the convective precipitation percentage of the six rainfall events determined by the method of Steiner et al.(1995) is similar to that by the method of Yang and Houze(1995). The highest convective precipitation volume percentage is about 8%~27% in spring rainfall, 48%~70% in Mei-Yu front, 74%~85% in Typhoon Mindulle, 82%~92% in the southwesterly flow triggered by Typhoon Mindulle, 72%~94% in summer thunderstorm, and 24%~75% in autumn cold front. Analyzing the simulated surface rainfall of terrain-sensitivity experiments of Typhoon Nari(2001) by Yang et al.(2007), we conclude that the distribution of convective and stratiform precipitation is strongly affected by Taiwan terrain. | en_US |