| The Regional Climate Model version3(RegCM3) coupled with a chemistry-aerosol model is used to investigate the effect of three main kinds of anthropogenic aerosol(sulfate, black carbon and organic carbon) on regional climate in east Asia. The temporal and spatial distribution of aerosols and their influences on the radiative forcing, surface temperature, rainfall and the rain belt in eastern China during the recent20years are analyzed. The main work and conclusions are the folio wings:(1)Evaluation results show that, the regional climate model(RegCM3) reproduces the characteristics of east Asian general circulation and the mean state of climate in China. So the simulation results of this test can be used for further studies.(2)The distribution of aerosol emissions is analyzed, and we simulated the distribution and seasonal variation of column burden and optical depth of aerosols. The results show that the model well reveals the distribution of column burden and optical depth of aerosols. The high concentration of aerosols is mainly located in the regions which have more people and developed industry and agriculture. The maximum value of column burden of aerosols in Chinese main emission area appears in summer and the minimum in writer, but seasonal variation of column burden of aerosols in northeast part of India Peninsula large emission area is not obvious. The column burden of aerosols in two sub-area presents obvious interannual variation characteristics, showing an upward trend. Sulfate aerosols dominate in Chinese main emission area, but organic carbon aerosols dominate in northeast part of India Peninsula large emission area. The transport of aerosols by east Asian monsoon is one of the main reasons for seasonal variation of aerosols distribution.(3)The direct radiative forcing of three main kinds of anthropogenic aerosol is estimated, and then we discuss their effect on regional climate in east Asia. The results show that the short wave radiative forcing of aerosols at both the top of atmosphere and the ground is negative. Adding of three kinds of aerosol has significant effects on surface temperature in East Asia. The cooling center is located in Sichuan Basin in winter, whereas the greatest decrease in surface temperature is found in North China in summer. The direct climate effect of sulfate, black carbon and organic carbon aerosols leads to a reduction of winter precipitation in most regions of East Asia. Summer rainfall in East Asia has a significant correlation with summer mean column burden of aerosols in Chinese main emission area. The rain belt in eastern China will shift southward. |
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