北京大气中NO、NO和O浓度变化的相关性分析

被引:170
作者
安俊琳 [1 ]
王跃思 [2 ]
李昕 [2 ]
孙扬 [2 ]
申双和 [1 ]
石立庆 [2 ]
机构
[1] 南京信息工程大学应用气象学系
[2] 不详
关键词
城市大气污染; 光化学氧化剂; 臭氧; 区域贡献; 局地贡献;
D O I
10.13227/j.hjkx.2007.04.004
中图分类号
X51 [大气污染及其防治];
学科分类号
0706 ; 070602 ;
摘要
臭氧(O3)是城市污染大气中的首要光化学污染物,其变化规律与氮氧化物(NOx=NO+NO2)关系密切.采用49C臭氧分析仪和42CTL氮氧化物分析仪对北京城区O3和NOx浓度进行了连续观测,时间为2004-082005-07.结果显示,O3和OX(O3+NO2)浓度在午后15:00左右出现峰值,NOx呈双峰态日变化,在07:00和23:00左右出现峰值.不同季节污染物的浓度变化存在差异,O3和NOx浓度分别在夏季和冬季达到最大.NOx浓度存在100×10-9(体积分数)的“分界点”,NOx低浓度时以NO2为主,NOx高浓度时NO占大部分.OX区域贡献和局地贡献存在明显的季节变化,前者主要受区域背景O3的影响,在春季最大,后者主要受局地NOx光化学反应的制约,在夏季最强,同时OX组分呈现显著的昼夜差异.
引用
收藏
页码:4706 / 4711
页数:6
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