Observations of ozone vertical profiles and corresponding precursors in the low troposphere in Beijing, China
Observations of ozone vertical profiles and corresponding precursors in the low troposphere in Beijing, China
复制标题
北京对流层低层臭氧垂直剖面及相应前体的观测
DOI：
10.1016/j.atmosres.2018.06.012
复制
发表时间：
2018-11
影响因子：
5.5
通讯作者：
Liu JG
中科院分区：
文献类型：
--
作者：
Chi XY;Liu C;Xie ZQ;Fan GQ;Wang Y;He PZ;Fan SD;Hong QQ;Wang Z;Yu XW;Yue FG;Duan JB;Zhang PF;Liu JG
2014年10月26日至11月6日，在北京中国科学院大学站（简称UCAS站，一个北方郊区站）对对流层低层臭氧及其前体物和气溶胶进行了综合观测，重点比较了污染和清洁条件下的大气气溶胶特征。利用差分吸收激光雷达测量了对流层低层臭氧和气溶胶消光系数的垂直廓线，利用地面多轴差分吸收光谱仪（MAX-DOAS）测量了对流层垂直柱密度（VCD）以及HCHO和NO2的垂直廓线。O3在边界层（0.3-1.0 km）中随高度的变化呈正梯度，在夜间呈现分层结构，而在晴天则呈均匀分布。污染条件的特点是较高水平的大气污染物（O3，气溶胶，HCHO和NO2）和更多的动态变化相对于清洁期。在轻度至中度污染期间，边界层内的O3浓度升高，最高超过60 ppbv。在灰霾天气，来自北京市区和河北南部工业和城市化地区的气团可以带来大量的前体物，增强激光雷达站点上空的O3形成。边界层内O3的光化学生成在灰霾天由VOC限制机制控制，而在晴天则转变为VOC-NOx混合限制机制。敏感性分析表明，当空气质量来自南方污染区时，臭氧产生的敏感性主要受VOCs限制区的影响。北京市区和河北省工业和城市化地区VOC排放的减少将有利于UCAS场地O3污染的缓解。
A comprehensive investigation of ozone, its precursors as well as aerosols in the low troposphere was conducted over the University of Chinese Academy of Sciences site (abbreviated as UCAS site, a northern suburban site) in Beijing during the period of October 26 to November 6, 2014, with a focus on the comparison between polluted and clean conditions. The vertical profiles of ozone and aerosol extinction coefficients in the low troposphere were measured by differential absorption lidar, and the tropospheric vertical column densities (VCDs) as well as vertical profiles of HCHO and NO2were measured by ground-based Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS). O3in the boundary layer (0.3–1.0 km) had a positive gradient with height and presented a stratified structure at night on haze days, in contrast to a uniform distribution during clean episodes. The polluted conditions were characterized by higher levels of atmospheric pollutants (O3, aerosol, HCHO and NO2) and more dynamic variations with respect to clean periods. During lightly to moderately polluted periods, elevated concentrations of O3within the boundary layer were observed with a maximum exceeding 60 ppbv. In haze days, the air masses from urban Beijing and southern Hebei industrial and urbanized areas could bring large amounts of precursors, enhancing O3formation over the lidar site. The photochemical production of O3within the boundary layer was controlled by a VOC-limited regime in haze days and turned into a mixed-VOC-NOx-limited regime on clean days. According to sensitivity analysis, when air masses came from southern polluted regions, the sensitivity of ozone production was dominated by VOC-limited regime. The reduction of VOC emissions from urban Beijing and Hebei industrial and urbanized areas would favor the mitigation of O3pollution at UCAS site.
登录
查看更多内容
影响因子：
6.3
作者：
J. Zhang;Tao Wang;W. Chameides;C. Cardelino;J. Kwok;D. Blake;A. Ding;K. So
通讯作者：
J. Zhang;Tao Wang;W. Chameides;C. Cardelino;J. Kwok;D. Blake;A. Ding;K. So
影响因子：
5.5
作者：
Zhanshan Wang;Yunting Li;Tian Chen;Dawei Zhang;Feng Sun;Q. Wei;Xin Dong;Rui-wen Sun;Huan Nin
通讯作者：
Zhanshan Wang;Yunting Li;Tian Chen;Dawei Zhang;Feng Sun;Q. Wei;Xin Dong;Rui-wen Sun;Huan Nin
影响因子：
5
作者：
Xiao Tang;Zifa Wang;Jiang Zhu;A. Gbaguidi;Qizhong Wu;Jie Li;Tong Zhu
通讯作者：
Xiao Tang;Zifa Wang;Jiang Zhu;A. Gbaguidi;Qizhong Wu;Jie Li;Tong Zhu
影响因子：
5
作者：
H. Güsten;G. Heinrich;D. Sprung
通讯作者：
H. Güsten;G. Heinrich;D. Sprung
影响因子：
--
作者：
G. Tonnesen;R. Dennis
通讯作者：
G. Tonnesen;R. Dennis