摘要
以2005年北京大气中臭氧(O3)、氮氧化物(NOx)、一氧化碳(CO)和NMHCs观测资料为基础,分析了夏季O3及其前体物的变化特征以及O3产生的影响因素。结果表明,北京夏季大气中O3体积分数较高,最高φ(O3)为199.79×10-9。按丙烯等量体积分数计算,大气中NMHCs体积分数以苯乙烯体积分数最高。AHC占总NMHCs的大部分,而AHC中以R-AROM最高。大气氧化剂OX产生率随着NOx的增加而递增,平均产生率为12.5×10-9h-1,而O3产生效率平均为4.0。O3净产生率在正午12:00最大,O3产生的过程中以过氧氢自由基的光化学生成反应为主。敏感性试验发现,大气中O3体积分数主要受NMHCs体积分数的控制,其中以R-AROM和R-OLE对大气中O3产生的贡献最大。
Data obtained in Beijing during strengthened period study in summer 2005 are analyzed to unravel the relationship between ground-level ozone （03） and pollution precursors （NOx, CO, NMHCs） and estimate their effects on photochemical ozone. The highest concentrations of ozone appear in summer. Eth-benzene is the largest part of NMHCs by propylene-equivalent concentrations. The reactivity of NMHCs is dominated by anthropogenic NMHCs and of the anthropogenic NMHCs, reactive aromatics dominate in which eth-benzene is the most important. Oxidant production rate increases with increasing NOx, with the average of （12.5±8.3）×10^9·h^-1. Ozone production efficiency is 4.0. The highest net ozone production rate appears in the noontime. Photochemical formation of HO2＋NO and XO2＋NO are the largest part of ozone production. The sensitive experiments by a photochemical box model indicate that the formation of ozone of Beijing area is limited by NMHCs, in particular reactive aromatics and alkene.
出处
《生态环境学报》
CSCD
北大核心
2009年第4期1318-1324,共7页
Ecology and Environmental Sciences
基金
国家重点基础研究发展规划(973)项目(2007CB407303)
中国科学院大气物理所LAPC开放课题(LAPC-KF-2008-08)
