利用地基遥感观测数据和气溶胶模型,分析了北京地区2013年1月份灰霾期间气溶胶中不同成分的光学特性,并使用大气辐射传输模式估算了气溶胶中不同成分对直接辐射强迫的贡献。结果显示,在严重灰霾时期,大气中的硫酸盐等水溶性气溶胶光学厚度AOD(440 nm)显著增加,对气溶胶光学厚度的贡献达到70%以上,同时黑碳气溶胶对总光学厚度(440 nm)的贡献也呈现增长趋势,是晴朗天气下的8倍以上。严重灰霾(2013-01-28)时气溶胶的直接辐射强迫显著增加,但气溶胶中不同成分对辐射强迫的贡献不同,黑碳成分在气溶胶对大气层的辐射强迫中占主要贡献的57%,而水溶性成分则在气溶胶对地表的辐射强迫中占主要贡献的60%。

We analyzed aerosol optical, physical properties in Beijing city in January of 2013 based on ground-based remote sensing data, and used radiative transfer model to estimate aerosol radiative forcing. The results show that water-soluble Aerosol Optical Depth (AOD) increases rapidly in haze days, and contributes most to the total AOD(>70%), black carbon aerosol AOD increasesalso in haze days, which is about eight times larger than clear days. The direct radiative forcing caused by aerosol is significant, but different aerosol compositions have different effects.Black carbon dominatesforcing in the atmosphere (>57%), while water-soluble dominates in surface forcing(>60%).