摘要
摘要:利用SBDART（Santa Barbara DISORT Atmospheric Radiative Transfer）辐射传输模式，结合AERONET（Aerosol Robotic Network）北京站观测的气溶胶光学特性数据，评估北京地区近十年气溶胶以及黑碳气溶胶的辐射强迫，主要研究结果如下：北京近十年气溶胶平均光学厚度（aerosol optical depth, AOD_440nm）为0.61±0.56，?ngstr?m波长指数均值为1.09，单次散射反照率（single scattering albedo, SSA_440nm）的均值为0.888±0.045；AOD呈现下降趋势，SSA呈上升趋势，表明该区域气溶胶污染有所改善。晴空条件下，大气层顶、地面和大气的气溶胶直接辐射强迫多年均值分别为?24.91±19.80 W m^?2、?65.52±43.78 W m^?2、40.61±28.62 W m^?2，即气溶胶对大气层顶和地表为冷却效应，对大气产生加热作用。气溶胶和黑碳气溶胶的直接辐射强迫绝对值的年际变化表现为微弱的下降趋势，季节变化特征为春夏季高，冬季低，这与AOD的变化规律一致。并且黑碳气溶胶的直接辐射强迫下降趋势与SSA的上升趋势呈现较好的反位相关系。
关键词:SBDART模式/
气溶胶/
光学特性/
黑碳/
辐射强迫
Abstract:Combined with the aerosol optical characteristic data observed by Aerosol Robotic Network (AERONET) Beijing station, the Santa Barbara DISORT Atmospheric Radiative Transfer (SBDART) radiation transmission mode was used to evaluate the radiative forcing of aerosols and black carbon (BC) aerosols in Beijing in the recent decade. The main results are as follows: The mean values of aerosol optical depth (AOD) for 440 nm and ?ngstr?m exponent are 0.61±0.56 and 1.09, respectively, while the mean value of single scattering albedo (SSA) for 440 nm is 0.888±0.045. AOD shows a slight decreasing trend in the recent decade, but SSA shows a slight increasing trend, indicating that aerosol pollution in Beijing has improved. Under clear sky conditions, the annual radiative forcing values of the aerosol at the top of the atmosphere, on the ground, and in the atmosphere are ?24.91±19.80 W m^?2, ?65.52±43.78 W m^?2, and 40.61±28.62 W m^?2, respectively. This indicates that the aerosol heats the atmosphere although it has a cooling effect on the top of the atmosphere and on the surface. The inter-annual variation of the absolute value of the direct radiative forcing of aerosols and BC aerosols shows a slight decreasing trend, and the seasonal variation is higher in spring and summer and lower in winter, which is consistent with the changing rule of AOD. The decreasing trend of direct radiative forcing of BC aerosols and the increasing trend of SSA show a good inverse phase relationship.
Key words:SBDART model/
Aerosol/
Optical characteristic/
Black carbon (BC)/
Radiative forcing



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