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| 1 | 北京及周边地区夏季PM_(2.5)中含碳组分污染特征与来源解析显示文摘为研究《打赢蓝天保卫战三年行动计划》等政策实施后北京及其周边区域夏季环境PM_(2.5)含碳组分特征及来源,2019年7月分别在北京城区与河北郊区的2个站点同步连续采集大气PM_(2.5)样品,利用热光碳分析仪分别测定了有机碳(OC)和元素碳(EC)及其组分的质量浓度;通过最小OC/EC比值法、最小相关系数法估算了二次有机碳(SOC)浓度;利用主成分分析、后向轨迹分析等方法探究了含碳气溶胶的来源。结果表明:夏季北京城区PM_(2.5)中ρ(OC)和ρ(EC)平均分别为(6.34±0.64),(1.96±0.29)μg/m^(3),分别占ρ(PM_(2.5))的18.65%和5.78%;河北郊区PM_(2.5)中ρ(OC)与ρ(EC)平均分别为(6.29±0.79),(3.54±0.63)μg/m^(3),分别占ρ(PM_(2.5))的17.69%和9.53%。2种方法估算出北京城区的ρ(SOC)分别为(3.35±0.59),3.98μg/m^(3),分别占ρ(OC)的(51.77±6.97)%和68.48%;河北郊区的ρ(SOC)分别为(3.28±0.69),4.17μg/m^(3),分别占ρ(OC)的(62.42±9.62)%和68.32%。此外,夏季北京城区与河北郊区均存在较为严重的二次污染;北京城区含碳组分主要污染源是混合机动车排放、道路扬尘及燃烧源;而工业燃煤排放、机动车尾气及扬尘是河北郊区含碳组分的主要污染源。后向轨迹分析发现,夏季气团轨迹主要来自东南、西南及偏南方向,且对北京城区与河北郊区2个区域PM_(2.5)中碳组分的影响较大。 | 沈嵩 刘蕾 温维 邢奕 苏伟 孙嘉祺 | 2022 | 环境工程2022，40，2： | 5 |
| 2 | 2016~2020年上海市PM_(2.5)化学组成特征和来源解析显示文摘2016~2020年在上海市区和郊区的6个点位开展了颗粒物系统性观测研究,分析了PM_(2.5)的质量浓度以及水溶性离子、有机碳/元素碳、无机元素等化学组分,并利用正矩阵因子分解模型对PM_(2.5)的来源进行了解析.结果表明,上海PM_(2.5)浓度水平呈现下降趋势,年均质量浓度依次为46,43,37,40,39μg/m3,表现为冬高夏低,西高东低的时空分布特征.有机物在PM_(2.5)中占比最高(30%~32%),不同年份和季节间的差异较小.二次无机离子(硫酸盐、硝酸盐和铵盐)的区域性特征明显,其中硝酸盐的占比在5a间升高最多,且在冬季污染过程中起到了关键作用.解析得到PM_(2.5)的来源有9类,分别为二次硝酸盐(30.6%)、二次硫酸盐(20.7%)、机动车(12.6%)、工业(8.0%)、生物质燃烧(7.7%)、扬尘(6.5%)、燃煤(5.8%)、海盐(4.8%)和船舶(3.2%).机动车和船舶等移动源、秸秆焚烧和烟花爆竹燃放等生物质燃烧源的贡献浓度在研究期间呈现下降趋势,体现了相关治理措施的管控效果. | 赵倩彪 胡鸣 伏晴艳 | 2022 | 中国环境科学2022，42，11： | 4 |
| 3 | Yangtze River Delta Aerosol liquid water in PM_(2.5)and its roles in secondary aerosol formation at a regional site of Yangtze River Delta显示文摘Aerosol liquid water content(ALWC)plays an important role in secondary aerosol formation.In this study,a whole year field campaign was conducted at Shanxi in north Zhejiang Province during 2021.ALWC estimated by ISORROPIA-Ⅱ was then investigated to explore its characteristics and relationship with secondary aerosols.ALWC exhibited a highest value in spring(66.38μg/m^(3)),followed by winter(45.08μg/m^(3)),summer(41.64μg/m^(3)),and autumn(35.01μg/m^(3)),respectively.It was supposed that the secondary inorganic aerosols(SIA)were facilitated under higher ALWC conditions(RH>80%),while the secondary organic species tended to form under lower ALWC levels.Higher RH(>80%)promoted the NO_(3)^(-)formation via gas-particle partitioning,while SO_(4)^(2-)was generated at a relative lower RH(>50%).The ALWC was more sensitive to NO_(3)^(-)(R=0.94)than SO_(4)^(2-)(R=0.90).Thus,the self-amplifying processes between the ALWC and SIA enhanced the particle mass growth.The sensitivity of ALWC and OX(NO_(2)+O_(3))to secondary organic carbon(SOC)varied in different seasons at Shanxi,more sensitive to aqueous-phase reactions(daytime R=0.84;nighttime R=0.54)than photochemical oxidation(daytime R=0.23;nighttime R=0.41)in wintertime with a high level of OX(daytime:130-140μg/m^(3);nighttime:100-140μg/m^(3)).The self-amplifying process of ALWC and SIA and the aqueous-phase formation of SOC will enhance aerosol formation,contributing to air pollution and reduction of visibility. | Ruifang Shi Fei Zhang Yemin Shen Jiasi Shen Bingye Xu Binyu Kuang Zhengning Xu Lingling Jin Qian Tang Xudong Tian Zhibin Wang | 2024 | Journal of Environmental Sciences2024，，4： | 1 |
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