陕西省榆林市秋冬季黑碳观测研究

 利用2011年秋冬季榆林大气成分站黑碳浓度、颗粒物质量浓度、大气能见度、地面气象资料，计算边界层高度、气溶胶吸收系数、大气消光系数，导出单次散射反照率，并对其进行分析讨论。结果表明：（1） 榆林秋冬季平均黑碳浓度为2.6 μg·m^-3。（2）黑碳占颗粒物质量浓度PM_1.0比值为10.6%，黑碳与颗粒物质量浓度PM_1.0、PM_2.5、PM₁₀相关系数分别为0.91、0.91、0.72。（3）黑碳浓度受边界层高度影响，沙漠风场对黑碳的堆积输送起主导作用。（4） 榆林地区气溶胶吸收系数与大气消光系数比值为16.8%。（5）单次散射反照率平均值为0.72。

Concentration Variation and Absorption Characteristics of Black Carbon during Autumn and Winter in Yulin near Mu Us Sandy Land

To understand the impact of black carbon aerosol on local pollution, black carbon aerosol is studied at Yulin. The data of black carbon concentration, particle mass concentration, visibility, and meteorological data measured during autumn and winter of 2011-2012 at Yulin were used to calculate the planetary boundary layer top height, aerosol absorption coefficient, and atmospheric extinction coefficient, then the single scattered albedo was derived from the calculation results. Concentration variation and absorption characteristics of Black Carbon were observed. The results showed that: (1)The mean value of black carbon concentration is 2.6 μg·m^-3 within a range between 0.07 μg·m^-3 and 10.6 μg·m^-3. (2) The percentage of black carbon concentration in PM1.0 is 10.6 %, and the correlation coefficients between black carbon and particle mass concentrations of PM_1.0, PM_2.5, and PM₁₀ are 0.91, 0.91, and 0.72, respectively. (3) Black Carbon concentration is affected by planetary boundary layer top height, and its accumulation and transportation are affected by the desert wind field. (4) The percentage of aerosol absorption coefficient in the atmospheric extinction coefficient is 16.8% within a range between 2.3% and 67.8%. (5)The mean single scattering albedo is 0.72, ranging from 0.51 to 0.86.