摘要
对2006年北京气象塔每周大气中非甲烷烃(NMHC)数据进行了分析和研究,烷烃和芳香烃是大气中最丰富的组分,总NMHC浓度夏秋两季最高,春季最低。正矩阵因数分解(PMF)模型解析出5个非甲烷烃可能来源,分别是汽车尾气、汽油挥发、工业排放、燃烧源和植物排放。PMF解析的NMHC浓度与实测值有很好的一致性。和交通源相关的汽车尾气和汽油挥发是主要的排放源,贡献率分别为36.0%、26.3%,其他排放源为工业排放(23.1%)、燃烧源(10.1%)、植物排放(4.6%)。由于源、汇以及气象条件的影响,PMF解析出的各排放源贡献也表现出明显的季节变化。
Weekly concentrations of ambient non-methane hydrocarbon compounds （NMHC） were analyzed in 2006 at Beijing Meteorological Tower. Paraffin and aromatic compounds were the most abundant group, the maximum concentration of NMHC was occurred in summer and fall season, and the concentration of NMHC reaches their lowest level during the spring season. Five factors were identified with good comparison between predicted and measured concentration using positive matrix factorization（PMF）. Mobile source were the most significant contributor to NMHC （motor vehicle exhaust contribute to 36.0% and evaporative emission was 26.3%）, with other sources such as industry emission （23.1%）, combustion emission （10.1%） and biogenic emission （4.6%）. Like the NMHC, the source contribution shows the obviously seasonal variation, mainly because of the variations of sources, sink and metrology factor.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2009年第5期35-39,共5页
Environmental Science & Technology
基金
国家高技术研究发展计划“863”项目(2006AA06A301)
国家自然科学基金项目资助(40525016)
国家重点基础研究发展计划“973”项目(2007CB407303)
