本文使用北京地区不同时期(2009年1月和2013年1月)的地基气溶胶观测资料,估算了灰霾天气的人为气溶胶光学厚度,在此基础上结合气溶胶光学参数进行了对比分析。结果表明:(1)2013年1月人为气溶胶光学厚度(440 nm)较2009年1月有所增加,月平均值分别为0.88和0.44;(2)2013年1月灰霾污染中人为气溶胶占主导天数比例是86.7%,高于2009年1月的62.5%;(3)2013年1月人为成分在气溶胶光学厚度(440 nm)中的贡献平均达88%,说明灰霾污染主要是由人为气溶胶造成的;(4)本文所选取的两次灰霾天气,都是由北京本地污染物堆积和南部周边城市污染物外源的输入共同作用造成的。

we estimated anthropogenic contributions to Aerosol Optical Depth (AOD) during days of high haze level using ground-based measurements in Beijing (January 2009 and 2013). We compared the anthropogenic AOD (AOD_an) with optical parameters determined directly from aerosol samples. The results showed: (1) The monthly mean AOD_an (at 440 nm) of January was 0.88 in 2009 and 0.44 in 2013; (2) The proportion of days where contributions from AOD_an dominated in January 2013 was 86.7%, higher than that in January 2009 (62.5%); (3) The ratio of the AOD_an to total AOD (at 440 nm) was about 88% in January 2013, indicating the importance of the anthropogenic aerosol contribution to haze pollution; (4) The two haze events studied featured contributions from accumulation of local pollutants and pollutants transported from surrounding areas of Beijing.