中文摘要：

利用区域气候模式RegCM3模拟研究2000年我国有机碳气溶胶的时空分布特征和辐射效应,得出以下结论：有机碳气溶胶主要分布在我国黄河以南、青藏高原以东的广大区域,且柱含量由南向北递减;柱含量最大值可达3 mg/m2以上,出现在华南、中南、云贵、四川和西藏东南部。另外,柱含量分布有着明显的季节性,冬季最大,春季次之,夏季最小。在此基础上,本文还对有机碳气溶胶的柱含量时空分布变化的原因进行了分析。有机碳气溶胶在大气顶和地表均产生负的辐射强迫,其分布特征与柱含量分布特征基本一致,而且大气顶和地表的辐射强迫都具有明显的季节变化。模拟的大气顶辐射强迫在-0.1～-0.5 W/m2之间,与IPCC估计的有机碳气溶胶的辐射强迫数值-0.41 W/m2相当,说明区域气候模式RegCM3中有关有机碳气溶胶的参数化方案是比较合理的。

英文摘要：

The regional climate model RegCM3 is used to simulate temporal and spatial distribution characteristics and radiative forcing of organic carbon aerosols in China.The preliminary simulation results show that organic carbon aerosols are mostly concentrated in the area south to the Yellow River and east to the Tibetan Plateau.There is a decreasing trend of column burden of organic carbon aerosols from south to north in China.The maximum value of column burden of organic carbon aerosols is above 3 mg/m2,which is located in the southern part of China,that is,Yunnan,Guizhou and Sichuan provinces,mid-and south-China and southeast of Tibetan Plateau.Having seasonal variation characteristics,the simulation shows that the maximum value of column burden of organic carbon aerosols appears in winter,the second largest value in spring and the minimum in summer.The radiative forcing of organic carbon aerosols shows negative both on top of the atmosphere（TOA） and on the ground and varies seasonally.The temporal and spatial characteristics of the radiative forcing of organic carbon aerosols are basically consistent with its column burden.Compared with the value of-0.41W/m2,issued by IPCC（2001） for the radiative forcing of organic carbon,the simulated radiative forcing on TOA of the present study is in the range of-0.1 ~-0.5 W/m2,which is equivalent with IPCC＇s value and implies that the parameterization scheme for organic carbon aerosols in RegCM3 is reasonable.