摘要
文章研究基于PM_(2.5)样品采集和水溶性离子测定,运用潜在源贡献分析法和WRF-CAMx模式识别分析了北京市和唐山市2017年1月PM_(2.5)的潜在源区和工业源传输矩阵,通过计算单位排放贡献,分析了京津冀典型工业源PM_(2.5)中一次颗粒物、硫酸盐和硝酸盐的区域贡献和分源贡献规律。结果表明,2017年1月北京和唐山PM_(2.5)浓度均高于国家二级标准,SNA占PM_(2.5)的32.85%~53.68%,且在污染时段,SNA及其前体物浓度均有明显提升;两地冬季潜在源主要受来自西北部内蒙古方向的远距离传输以及东南部渤海湾方向的中短距离传输这两部分污染源区的潜在影响,唐山受本地污染影响更大;从传输矩阵来看,北京和唐山的PM_(2.5)工业源外来贡献分别占总浓度的63.87%和8.66%,其中对北京PM_(2.5)浓度贡献较高的区域为唐山和京津冀中部地区,分别贡献了24.78%和21.18%,在污染日时段,受唐山和南部地区的PM_(2.5)传输贡献分别提升了5.27%和3.46%,受西北地区的影响减少了4.34%。对唐山贡献较高的区域为中部地区和东北部地区,为5.07%和2.10%,在污染日时段,外来传输贡献并没有显著波动(低于1%)。二次组分中,硝酸根的传输性最为显著;两地工业外来源单位排放贡献除却其各自周边地区较大以外,其西北传输通道沿线城市(张家口→北京→唐山)的单位排放贡献亦十分显著,且在这一通道上的外来输送,其第2层(非地面排放源)的单位排放贡献明显大于其他地区;从具体工业源来看,对北京市单位排放贡献最大的行业为其他工业源,对唐山则是冶金源。
This study based on PM_(2.5)sample collection and water-soluble ion determined,Potential Source Contribution Factor Analysis(PSCF)and WRF-CAMx modeling system to recognize the potential source areas and industrial source transmission matrix of PM_(2.5)in Beijing and Tangshan in January 2017.Analyzed the regional transmission contribution and sub source contribution laws of primary particulate matter,sulfate and nitrate of industrial source in Beijing-Tianjin-Hebei region by calculating the contribution per unit of emissions.The results showed that in January 2017,the PM_(2.5)concentration in Beijing and Tangshan were both higher than the Ambient air quality secondary standard,SNA accounted for 32.85%~53.68%of all components of PM_(2.5).The concentrations of SNA and its precursors increased significantly during the pollution period.The potential sources of winter in the two places were mainly affected by the long-distance transmission from Inner Mongolia in the northwest and the medium-distance transmission from the Bohai Bay in the southeast,while Tangshan was leading affected by local emission.The transmission matrix showed that regional transport contributed 63.87%and 8.66%to industrial PM_(2.5)in Beijing and Tangshan.Among them,the regions that contributed higher to Beijing’s PM_(2.5)concentration were Tangshan and the central part of Beijing-Tianjin-Hebei,contributing 24.78%and 21.18%respectively.The contribution of PM_(2.5)transmission from Tangshan and southern regions increased by 5.27%and 3.46%,and the impact from the northwest region decreased by 4.34%during the pollution days.As the regions with higher contribution to Tangshan were the central and northeastern areas,which contributed 5.07%and 2.10%.The contribution of external transmission did not fluctuate significantly during the pollution periods(less than 1%).As for the secondary components,the transport of nitrate was the most significant one.The contribution of industrial source unit emissions in the two cities was in the order of primary particulate matter>sulfate>nitrate.In addition to their respective surrounding areas,cities along the Northwest Transmission Channel(Zhangjiakou→Beijing→Tangshan)was also a significant contributor of industrial transmission sources unit of emissions.Moreover,the contribution of unit emission of the second layer(high-level emission sources)in these areas were significantly greater than that in other regions.In terms of specific industrial sources,other industrial sources contributed the most to Beijing’s unit emission,while Tangshan was the source of metallurgy sources.
作者
邵玄逸
王晓琦
钟嶷盛
王传达
SHAO Xuanyi;WANG Xiaoqi;ZHONG Yisheng;WANG Chuanda(Key Laboratory of Beijing on Regional Air Pollution Control,College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2021年第S01期141-149,共9页
Environmental Science & Technology
基金
国家自然科学基金重点项目(51638001)
国家重点研发计划项目(2018YFC0213203)
关键词
PM_(2.5)
潜在源贡献
工业源
单位排放贡献
PM_(2.5)
potential source contribution
industrial source
contribution per unit of emissions
作者简介
邵玄逸(1996-),男,硕士研究生,研究方向为区域大气复合污染防治,(电子信箱)shaoxuanyi@emails.bjut.edu.cn;通讯作者:王晓琦,男,助理研究员,博士,研究方向为大气复合污染防治,(电子信箱)wangxq@bjut.edu.cn。
