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- W2754638757 abstract "SO2是北京大气中重要的污染气体.为探讨亚太经合组织(APEC)峰会前后北京大气SO2的垂直分布及其对二次硫酸盐(SO42-)生成的影响,我们于2014年10月21日至11月30日在地面和北京325 m气象塔260 m高度处同步开展了气体SO2和亚微米颗粒物中硫酸盐(SO42-)实时连续在线观测.结果显示,采暖前,北京地面SO2浓度较低,但高层由于显著受到区域输送的影响浓度较高,两层污染物变化趋势也存在明显差异.采暖后,即APEC后,受本地供暖排放影响,SO2和SO42-浓度显著增加,两层的总体差异也相应减小,变化趋势也更为一致.湿度对SO2的液相转化起关键作用.我们发现近地面SO2的转化率(SOR)显著高于260 m,这主要与地面较高的湿度相关.事实上,SOR随着湿度增加而迅速增大,进一步凸显了湿度对SO2液相氧化的影响.另外,我们也发现SO2特别是260 m在低湿范围(RH 50%)内则呈下降趋势,说明不同湿度范围内的来源或者生成机制可能有所不同.SO42-和PM2.5浓度均随着湿度的增加而增加,但不同湿度范围,增加速率不同.通过相关性和和后向轨迹分析表明,区域输送(特别是途经北京西部和南部的气团)和本地燃煤排放分别是采暖前后污染物的主要来源." @default.
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- W2754638757 date "2016-06-25" @default.
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- W2754638757 title "APEC前后北京SO 2 垂直分布特征及其对二次硫酸盐生成的影响" @default.
- W2754638757 doi "https://doi.org/10.13671/j.hjkxxb.2015.0626" @default.
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