期刊
ATMOSPHERIC RESEARCH
卷 240, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.atmosres.2020.104930
关键词
VOCs; Vertical profile; PBL; SOA
资金
- National Key R&D Program of China [2017YFC0210000]
- National Natural Science Foundation of China [41705113, 41877312]
- Young Talent Project of the Center for Excellence in Regional Atmospheric Environment CAS [CERAE201802]
- Beijing Major Science and Technology Project [Z181100005418014]
- National Research Program for Key Issues in Air Pollution Control [DQGG0101]
- State Key Laboratory of Atmospheric Chemistry, Chinese Meteorological Administration (LAC/CMA) [2017A01]
The vertical structure of volatile organic compounds (VOCs) is important to understanding the formation mechanisms of O-3 and secondary organic aerosol (SOA). To explore the vertical evolution characteristics of VOCs, an observational field campaign using a tethered balloon was carried out in Yuanshi County, Shijiazhuang, from January 8 to 16, 2019. Meteorological variables of the planetary boundary layer (PBL) were measured, and 83 VOC samples were collected. The concentrations of 87 compounds and a total of 10 vertical profiles were obtained. The VOC concentration gradually decreased from the surface to 1000 m, decreasing by 34.8% from the surface to 400 m and 11.4% from 400 m to 1000 m. The proportion of alkanes increased from 60.2% to 79.0%; the proportions of alkenes, halohydrocarbons, and acetylene decreased from 11.8%, 12.3%, and 4.2% to 4.5%, 2.8%, and 1.8%, respectively; and the proportion of aromatics changed very little. The vertical evolution of VOCs had responses to different meteorological conditions in the PBL. The concentration decreased slower in a strong convection state than in a stable state. The VOC concentration at night was higher in the stable boundary layer (SBL) (235 +/- 135 ppbv) than in the residual layer (RL) (181 +/- 135 ppbv). The concentration and NO3 loss rate of alkenes decreased in the RL at night, implying that the nighttime SOA formation potential may be weaker in the RL.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据