The Research on the Acid Rain Spatial Distribution in Sichuan and Chongqing Regions

Acid rain has been one of the environmental problems in China.Because of the specific geographical and meteorological conditions and energy consumption structures,Sichuan province and Chongqing municipality have become the major acid precipitation regions.In this paper the contour plots of precipitation pH value and the spatial distributions of acid rain frequency have been mapped out with the precipitation routine monitoring data in the period of 1996-2005 by the GIS spatial analysis function,which reflects the spatial characteristics of acid rain in the last decade.It is shown that the acid rains are mainly distributed in the Sichuan Basin,and there seems a cycling pollution belt over the mountain area around the basin,and less acid rain pollution in the center of the basin.Meanwhile,the acidity of precipitation shows a very significant difference within and outside of the basin.