长沙市夏秋季VOCs特征及在臭氧生成中的作用研究
DOI:
作者:
作者单位:

湖南省生态环境监测中心

作者简介:

通讯作者:

中图分类号:

基金项目:

长株潭区域大气细颗粒物污染成因解析及防治关键技术研究与应用示范


Characteristics and role in ozone formation of ambient VOCs during summer and autumn in Changsha City, Hunan Province
Author:
Affiliation:

Hunan Ecological and Environmental Monitoring Center

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    近年来我国中部地区臭氧(O3)污染问题日益凸显,挥发性有机物(VOCs)是O3生成的重要前体物,对其开展研究对于臭氧污染防控具有重要意义。为了解我国中部地区VOCs污染特征及对臭氧生成的影响,本研究于2021年5~10月在湖南省长沙市主城区开展了VOCs在线监测,共计监测117种组分。测量结果显示,观测期间总VOCs平均体积分数为(23.09±9.97)×10-9,VOCs月均浓度呈“U”型变化,7月份最低,10月份最高;而VOCs日变化呈典型双峰型,受人为源活动影响显著。长沙市VOCs化学组成以含氧挥发性有机物(OVOCs)为主,其次是烷烃和卤代烃,然而对臭氧生成潜势有较大贡献的主要是OVOCs和芳香烃,二者合计占比达到68.3%,其中丙醛、乙醛、间/对-二甲苯、乙烯和甲苯是关键活性物种。OBM模拟结果显示:长沙市5月、8月和9月臭氧生成属于协同控制区,6-7月属于VOCs控制区,而10月处于NOx控制区。人为源VOCs中削减高碳醛类、烯烃类、烷烃类对臭氧防控最为有效。

    Abstract:

    The ground-level ozone (O3) concentration is continuously increasing in middle areas of China during recent years. Volatile organic compounds (VOCs) are important precursors in photochemical production of ozone, which is of great significance to carrying out research for controlling O3 prevention and control. In order to understand characteristics and role in ozone formation of ambient VOCs in middle areas, we conducted online VOCs observation in Changsha City from May to October in 2021, monitoring 117 species in total. The mean value of mixing ratios for measured VOCs was (23.09±9.97)×10-9. Monthly average concentration of VOCs in Changsha showed a “U” shape, with the lowest in July and the highest in October, while the diurnal variation of VOCs concentration showed a bimodal pattern, indicating the influence of human activities. OVOCs was the most abundant component of VOCs, followed by alkane and halo carbon. However, OVOCs and aromatics were the two largest contributors to ozone formation potential (OFP), with a cumulative contribution of 68.3%. Propionaldehyde, acetaldehyde, m/p-xylene, ethylene and toluene were the most important VOCs species to OFP. The observation-based model(OBM) showed that O3 formation in Changsha was in a transition regime in May, August, September and in a VOCs-limited regime from June to July, while in a NOx-limited regime in October. For the anthropogenic VOCs, ALDP, OLEP and PARP should be given priority in emission control measures.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2022-05-09
  • 最后修改日期:2022-09-30
  • 录用日期:2022-10-04
  • 在线发布日期:
  • 出版日期:

地址:江苏南京,宁六路219号,南京信息工程大学    邮编:210044

联系电话:025-58731025    E-mail:nxdxb@nuist.edu.cn

南京信息工程大学学报 ® 2022 版权所有  技术支持:北京勤云科技发展有限公司