京津地区大气中非甲烷烃(NMHCs)质量浓度水平和反应活性研究

2006年8月15日—9月15日同时在北京和天津对大气中的非甲烷烃（NMHCs）进行了同步观测，利用最大增量反应活性（MIR）计算了两地NMHCs的臭氧生成潜势以估计其对臭氧生成的影响. 结果表明，北京大气中ρ（NMHCs）平均值比天津高78.0 　μg/m3.用上午的ρ（NMHCs）计算了京津地区臭氧生成潜势，分别为1 470 和814 　μg/m3，其中苯系物对臭氧生成的影响最大，分别占总臭氧生成潜势的75%和73%，其次是烯烃（占13%和11%）和烷烃（占12%和16%）. 比较两地ρ（NMHCs）和NMHCs的反应活性可知，北京地区大气中NMHCs的组成比天津的稳定，且其反应活性强于天津. 结合臭氧浓度发现，北京地区大气的氧化能力比天津强. 

Ambient Mass Concentration and Reactivity of Non-Methane Hydrocarbons (NMHCs) in Beijing and Tianjin Cities

Simultaneous measurements of non-methane hydrocarbons （NMHCs） in the ambient atmosphere in Beijing and Tianjin cities were performed from August 15 toSeptember 15, 2006. The maximum increment reactivity （MIR） was used to evaluate the ozone production potential of NMHCs. The average ρ（NMHCs） in Beijing City was78.0 　μg/m3higher than that in Tianjin City. The ozone production potential of NMHCs was calculated by ρ（NMHCs） in the morning, at 1 470 　μg/m3 O₃ in Beijing City and 814 　μg/m3 O₃in Tianjin City, respectively. Aromatics have most contributions to the ozone production, accounting for 75% and 73% respectively in Beijing and Tianjin cities, followed by alkenes （13% and 11%） and alkanes （12% and 16%）. Comparing the mass concentration and reactivity of NMHCs in the two cities, it was indicated that the composition of NMHCs in Beijing City was more stable than in Tianjin City. Combined with the ozone concentration, it was found that the atmosphere oxidation ability was stronger in Beijing City than in Tianjin City.