【摘要】 分析了北京市两个采样点十三陵站 (清洁对照点 )和天坛站 (居民生活区 )的 1 1 0个大气颗粒物样品有机碳和元素碳的测定数据 ,结果表明两站点具有明显的季节变化特征。一号站 OC质量浓度年均值为 2 2 .0 μg/ m3,EC为 3 .6μg/m3,五号站 OC质量浓度年均值为 41 .5μg/ m3,EC为 7.8μg/ m3。 OC百分含量秋季高 ,反映出活跃的大气化学反应和严峻的污染形势 ,春季低表现了风沙气候的影响。城区的 EC百分含量冬季增高则是燃煤贡献所致。对 1 998年 1月份和 9、1 0月份的数据进行了实例分析。结果表明稳定的天气条件和北京特殊的地貌容易导致空气污染事件。有机物污染是1 998年北京秋季空气污染的一个特征。更多还原

【Abstract】 The organic carbon (OC) and elemental carbon (EC) have been determined for 110 atmospheric aerosol samples at two monitories sites (the Ming Tomb and Temple Heaven) in Beijing The OC and EC data showed obvious seasonal variations The annual average of OC concentration of the Ming Tomb site was 22 0μg/m 3, and EC was 3 6μg/m 3; while that of the Temple Heaven site was 41 5μg/m 3for OC, and 7 8μg/m 3for EC The percentage content of OC was the highest in autumn, as the consequence of the active atmospheric reactions and severe air pollution The lower percentage value in spring was due to the windy weather The widespread coal burning caused the high EC values in urban Beijing in wintertime The two case studies indicate that air pollution episodes are attributable to the steady meteorological conditions and the specific geographic features of Beijing The air pollution episode in autumn 1998 in Beijing is featured by organic pollution, as indicated by high OC values更多还原