威海市夏季臭氧及大气氧化性特征分析  

The characteristics of ozone and atmospheric oxidation capacity analysis in summer in Weihai

作　　者：张峰 李侃 许昭昭 张玲丽 成春雷 李建军[4] ZHANG Feng;LI Kan;XU Zhaozhao;ZHANG Lingli;CHENG Chunlei;LI Jianjun(Weihai Ecological Environment Monitoring Center,Weihai 264200,China;Weihai Ecological Environment Affairs Service Center,Weihai 264200,China;Institute of Mass Spectrometry and Atmospheric Environment,Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution,Jinan University,Guangzhou 510632,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China)

机构地区：[1]威海市生态环境监控中心,威海264200 [2]威海市生态环境事务服务中心,威海264200 [3]暨南大学质谱仪器与大气环境研究所,广东省大气污染在线源解析系统工程技术研究中心,广州510632 [4]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710061

出　　处：《地球环境学报》2024年第3期447-458,486,共13页Journal of Earth Environment

基　　金：黄土与第四纪地质国家重点实验室开放基金(SKLLQG2218)。

摘　　要：威海市属于我国北方典型沿海城市,近年来的持续观测发现夏季易出现臭氧(O_(3))污染。以2023年夏季观测数据为约束,利用零维盒子模式分析威海市夏季O_(3)及大气氧化性特征,给出O_(3)污染防治的建议。2023年5月30日—6月30日,威海市污染天的首要污染物是O_(3),烷烃是挥发性有机物(VOCs)中浓度占比最高的组分,烯烃则是活性占比最高的组分。从清洁日到污染日烯烃活性增强最显著,O_(3)的化学生成和大气氧化性在污染日均有增加,促进了二次污染过程的发生。威海夏季大气氧化性水平较强,O_(3)对前体物的敏感区处于氮氧化物(NOx)和VOCs的过渡区,O_(3)污染防控需结合NOx和VOCs进行协同防控。O_(3)对前体物烯烃减排的变化最敏感,因此其污染防控过程需结合VOCs反应活性开展。基于威海市夏季观测数据分析O_(3)及大气氧化性特征,从O_(3)敏感性区域变化及VOCs反应活性角度为O_(3)污染防治策略提供了思路。Background,aim,and scope Ozone(O_(3))pollution has emerged as a significant concern for air quality in China,particularly as atmospheric fine particulate matter concentrations have declined in recent years.The complex formation of O_(3) is influenced by nitrogen oxides(NOx)and volatile organic compounds(VOCs),as well as by meteorological conditions and regional transport.While numerous urban studies have probed O_(3) formation mechanisms,coastal cities like Weihai,which are inf luenced by both anthropogenic emissions and the marine environment,may exhibit distinct O_(3) formation pathways compared to inland urban areas.This study aims to identify the primary controlling factors and key precursors for O_(3) formation in such coastal city.Materials and methods The observational data were integrated with a chemistry box model to analyze O_(3) characteristics and atmospheric oxidation capacity(AOC)in Weihai.This study also evaluated the production and loss rates of O_(3),the relative increment reactivity(RIR)of major VOCs in O_(3) production,and explored O_(3) mitigation strategies through simulations of NOx and VOCs reduction.Results During the summer pollution episodes,O_(3) emerged as the predominant pollutant.The concentration of alkanes increased from 6.1 nmol∙mol-1 to 9.1 nmol∙mol-1,accounting for the majority of the∙OH reactivity,with a substantial contribution exceeding 60%.In contrast,aromatics and alkenes contributed 18.2%and 17.3%,respectively.The overall reactivity of VOCs with the∙OH rose from 3.9 s-1 during clean days to 4.6 s-1 on polluted days.Concurrently,the net production rate of O_(3) increased from 6.0 nmol·mol-1·h-1 in clean days to 7.4 nmol∙mol-1∙h-1 under polluted days.The AOC during the daytime O_(3) pollution period reached 6.0×10-17 mol∙cm^(-3)∙s-1,surpassing the levels observed during clean days,which were 4.5×10-17 mol∙cm^(-3)∙s-1.The investigation of relative increase reactivity(RIR)analysis showed that NOx was negative between 06:00 and 10:00,while the RIR of NOx

关 键 词：威海 臭氧 大气氧化性 挥发性有机物(VOCs) VOCs反应活性 

分 类 号：X51[环境科学与工程—环境工程]