摘要
利用LLA - C 光化学反应机制, 在 NOx 体积分数 φ变化范围很广(1 .75 ~350 .0 ,单位为10 - 9 ,以下同) 的条件下,选择18 种NMHC 与NOx 的体积分数比(2 .0 ~200 .0) 模拟分析在什么条件下NMHC 的改变对臭氧生成量不大敏感而主要依赖于NOx 的大小,同时给出相应条件下OH 模拟值的变化。结果表明,OH 峰值均出现在φ(NMHC/NOx) ≈8 .0 。所找条件是φ( NOx) ≤50 .0 时要求φ( NMHC/NOx) ≥60 .0 ; φ(NOx) > 50 .0 时需要8 .0 ≤φ(NMHC/NOx) ≤28 .0 。相应O3 生成量的最大误差小于20 % 。该条件正适合我国典型污染城市当前φ(NOx) 水平和φ( NMHC/ NOx) 范围,可用于我国区域尺度空气质量模拟。与实测资料的对比还有待进一步开展。
Using the LLA-C mechanism, a box model, we have simulated changes in the concentration of O 3 and OH under a broad variety of eighteen initial reactant conditions of [NMHC]/NO x ratios (2.0 to 200.0) and NO x levels (1.75 to 350.0, the unit in the paper is volume ratio 10 -9 unless specified) to find a suitable condition under which the amount of ozone formed is not sensitive to changes in the amount of NMHC but strongly dependent on the concentration of NO x . Simulations indicate that the maximum OH concentration always occurs at φ(NMHC/NO x )≈8.0 under all NO x levels and that the demanded condition is φ(NMHC/NO x )≥60.0 while φ(NO x )≤50.0 and 8.0≤φ(NMHC/NO x )≤28.0 while φ(NO x )>50.0. The current NO x levels and NMHC/NO x ratios in the air over typical urban polluted areas in China happen to lie within this range. This implies that the condition may be suitable for regional air quality simulation in China. Further comparison with field measurements is still needed.
出处
《大气科学》
CSCD
北大核心
1999年第6期753-761,共9页
Chinese Journal of Atmospheric Sciences
基金
中国科学院重大项目
关键词
光化学反应机制
非甲烷烃
氮氧化物
臭氧
生成量
photochemical reaction mechanism nonmethane hydrocarbon (NMHC) nitrogen oxides (NOx) ozone