摘要：对 2006 年 3 月～2007 年 2 月在西安获得的黑碳气溶胶观测资料 及相关气象资料进行分析。 结果表明， 西安黑碳气溶胶浓度变化幅 度很大，全年黑碳日均浓度变化范围为 1 400~30 000 ng·m-3，平均值为 10 000 ng·m-3。在春、秋、冬 3 季其浓度日变化具有明显的双峰特征。西 安市黑碳浓度秋、冬季节的月份高，春、夏月份低。黑碳季节平均浓度分 别为春季 9 400 ng·m-3，夏季为 7 100 ng·m-3，秋季 12 000 ng·m-3，冬季 11 900 ng·m-3。 黑碳浓度的频次分布表明低浓度值在春季和夏季所占 比例大大高于秋、冬季节。研究发现气象要素（风速和混合层高度）对黑 碳浓度有重要的影响。
关键词：黑碳；气溶胶；影响因素
Abstract：The atmospheric black carbon aerosols were measured continuously at Xi’an，during Mar. 2006~Feb. 2007. The black carbon concentrations at Xi’an varied acutely over a range of 1 400~30 000 ng/m3， with the average value of 10 000 ng/m3 in daily mean concentration． Obvious diurnal variation was observed，with the highest hourly average concentrations in the morning and night during three seasons，the black carbon concentrations showed a clear seasonal pattern with high concentrations in autumn and winter and low values in spring and sum mer. The seasonal black carbon concentrations were 9 400， 7 100， 12 000， 11 900 ng/m3 for spring，summer，autumn and winter, respectively. The frequency distribution of black carbon concentrations showed a seasonal pattern. The influences of wind speed and mixed layer depth were discussed，which showed the black carbon concentrations were strongly affected by the variations of them.
Keywords：black carbon；aerosol；influence factor
