摘要
为进一步梳理近年来我国城市区域大气PM2.5污染防治方面的研究成果,基于我国31个城市PM2.5污染现状,以城市群为视角,总结了京津冀城市群、长三角城市群与川渝城市群PM2.5组成与污染特征,分析了PM2.5及其含碳气溶胶、水溶性无机离子、地壳元素等的整体特征,并在城市群间进行对比分析.结果表明:①3个城市群的ρ(PM2.5)高低顺序依次为京津冀城市群>川渝城市群>长三角城市群,长距离传输使PM2.5污染成为京津冀城市群、长三角城市群与川渝城市群面临的共同问题.②3个城市群的PM2.5中均以SNA和OC为主,尽管ρ(PM2.5)水平有下降趋势,但个别污染物(如SNA)略呈上升趋势.③京津冀城市群与川渝城市群的ρ(OC)接近,并且均高于长三角城市群的80%,较高的ρ(OC)/ρ(EC)反映我国城市群普遍存在SOC污染.④各城市群PM2.5监测网(如监测时间和采样方法)发展水平迥异,城市群之间的相互影响和传输机制尚不清楚.建议今后的研究向以下几个方面扩展:①对城郊乡村等大气背景点,以及水库、湖泊等地化循环的重要源汇区域开展研究.②针对同一区域开展采样时段更长且研究方法和分析手段上保持一致的研究.③借用国外经验公式时需考虑我国国情,对基础研究方法开展一系列优化,建立符合我国国情的标准化研究方法.
In order to further summarize the research achievements in the prevention and control of PM 2.5 pollution in China′s urban areas in the past decade,we discuss the concentrations,sources and pollution characteristics of PM 2.5 in 31 cities in Beijing-Tianjin-Hebei Region,Yangtze River Delta and Sichuan-Chongqing Region.In particular,we compare mass concentrations and the PM 2.5 compositions of organic aerosols,water-soluble ions and crustal materials.The results show that:(1)The concentration of PM 2.5 followed the order of the Beijing-Tianjin-Hebei Region>Sichuan-Chongqing Region>Yangtze River Delta.Long-range transport made PM 2.5 pollution a common issue in the three regions;(2)The PM 2.5 was dominated by OC and SNA in the three megacity regions.Although the concentration of PM 2.5 had a decreasing trend year by year,the concentrations of some components,such as water-soluble ions,increased slightly;(3)The concentrations of OC in the Beijing-Tianjin-Hebei Region and Sichuan-Chongqing Region were comparable but were 80%higher than those of the Yangtze River Delta.High OC EC indicated the prevalence of SOC in the three megacity regions;(4)PM 2.5 monitoring networks,including monitoring period and sampling methods,varied between the three regions,making interact-influence and transport mechanisms difficult to determine.Recommendations for future research include:(1)The need for further study in suburbs,rural and background sites.(2)The need for long-term studies in current urban monitoring locations and maintaining the consistency of research methods.(3)The need for standardizing research methods that are suitable for the current status of the atmospheric environment in China.
作者
刘晟东
史君楠
程勇
卢培利
冯婷
王锋文
张培玉
LIU Shengdong;SHI Junnan;CHENG Yong;LU Peili;FENG Ting;WANG Fengwen;ZHANG Peiyu(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;Department of Environment and Resources,Chongqing University,Chongqing 400044,China;Key Laboratory of Pollution Processes and Environmental Criteria,Ministry of Education,Nankai University,Tianjin 300350,China;Jiyuan Agricultural Product Quality Testing Center,Jiyuan 454650,China)
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2020年第2期243-251,共9页
Research of Environmental Sciences
基金
国家重点研发计划重点专项(No.2018YFC0214005)
国家自然科学基金项目(No.41603102)
南开大学环境污染过程与基准教育部重点实验室开放基金(No.201803)Supported by National Key Research and Development Program of China(No.2018YFC0214005)
National Natural Science Foundation of China(No.41603012)
Opening Project of Key Laboratory of Pollution Processes and Environmental Criteria,Ministry of Education,China(No.201803)
关键词
PM2.5
污染特征
城市群
PM 2.5
pollution characteristics
megacities
