【摘要】 为了了解北京及周边地区黑碳气溶胶的区域分布和时间变化特征,分析2006—2012年北京上甸子、南郊观象台,河北固城3个不同代表性站点的黑碳气溶胶浓度的变化特征。研究表明:北京上甸子、南郊观象台,河北固城3个站点黑碳气溶胶质量浓度的年均值分别为(2.2±2.4)、(6.5±7.3)、(9.6±8.4)μg/m3,呈现由北向南递增的趋势;从年际变化来看,上甸子站黑碳气溶胶浓度略有减小,南郊观象台站的浓度年均值呈现较为明显的减小趋势,固城站的浓度变化不大,数值一直维持在较大的水平;3个站点的黑碳气溶胶浓度均在夏、春季较小而冬、秋季较大,均呈现昼低、夜高的日变化特征。更多还原

【Abstract】 The variation characteristics of black carbon(BC) aerosol concentrations in Beijing and surrounding area were presented based on long-term observation at three sites of Shangdianzi, Guanxiangtai in Beijing City and Gucheng in Hebei Province during 2006—2012. The results show that the BC concentrations appear an increasing trend from north to south, with the mean values of mass concentration of(2.2±2.4),(6.5±7.3)and(9.6±8.4) μg/m3 in Shangdianzi, Guanxiangtai and Gucheng respectively. The annual average concentrations of BC show a slight decrease in Shangdianzi, while decrease obviously in Guanxiangtai. The BC concentrations in Gucheng vary few with years and keep on the high level. The seasonal average concentrations of BC are lower in summer and spring in this region. Higher BC concentrations in winter and autumn are likely attributed to the increasing of coal combusion for heating in winter and biomass burning in autumn as well as the relatively worse diffusion conditions. The daily variations of BC concentrations in the three stations are similar, with higher values at night and low in the afternoon.更多还原