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| 1 | Characteristics of PM_(2.5) pollution in Beijing after the improvement of air quality显示文摘Following the implementation of the strictest clean air policies to date in Beijing,the physicochemical characteristics and sources of PM_(2.5) have changed over the past few years.To improve pollution reduction policies and subsequent air quality further,it is necessary to explore the changes in PM_(2.5) over time.In this study,over one year(2017-2018)field study based on filter sampling(TH-150C;Wuhan Tianhong,China)was conducted in Fengtai District,Beijing,revealed that the annual average PM_(2.5) concentration(64.8±43.1μg/m^3)was significantly lower than in previous years and the highest PM_(2.5) concentration occurred in spring(84.4±59.9μg/m^3).Secondary nitrate was the largest source and accounted for 25.7%of the measured PM_(2.5).Vehicular emission,the second largest source(17.6%),deserves more attention when considering the increase in the number of motor vehicles and its contribution to gaseous pollutants.In addition,the contribution from coal combustion to PM_(2.5) decreased significantly.During weekends,the contribution from EC and NO3−increased whereas the contributions from SO4^2−,OM,and trace elements decreased,compared with weekdays.During the period of residential heating,PM_(2.5) mass decreased by 23.1%,compared with non-heating period,while the contributions from coal combustion and vehicular emission,and related species increased.With the aggravation of pollution,the contribution of vehicular emission and secondary sulfate increased and then decreased,while the contribution of NO3−and secondary nitrate continued to increase,and accounted for 34.0%and 57.5%of the PM_(2.5) during the heavily polluted days,respectively. | Xiaojuan Huang Guiqian Tang Junke Zhang Baoxian Liu Chao Liu Jin Zhang Leilei Cong Mengtian Cheng Guangxuan Yan Wenkang Gao Yinghong Wang Yuesi Wang | 2021 | Journal of Environmental Sciences2021，33，2： | 14 |
| 2 | 春季南海东沙岛硝酸盐干沉降通量、形成机制及其来源显示文摘硝酸盐是大气中主要的酸性离子,也是大气活性氮沉降主要的组成部分。中国目前对大气硝酸盐形成机制及其来源的研究主要集中在陆地区域,对海洋气溶胶的硝酸盐的形成机制及其来源的研究较少。本研究于2013年春季(3—5月),在中国南海东沙岛共计采集了86个总悬浮颗粒(TSP)气溶胶样本,分析了TSP样品中NO_(3)^(-)浓度、δ^(15)N-NO_(3)^(-)和δ^(18)O-NO_(3)^(-)值。结果表明:东沙岛春季TSP中NO_(3)^(-)浓度呈现逐月下降的趋势。基于NO_(3)^(-)浓度估算东沙岛春季NO_(3)^(-)-N干沉降通量范围为(1.0±0.5)—(3.4±1.7)mg·d^(-1)·m^(-2)(以N计,余同)。δ^(18)O-NO_(3)^(-)值在3月和4月(76.1‰±3.8‰和79.1‰±5.6‰)明显高于5月(67.0‰±7.5‰),表明东沙岛3月和4月硝酸盐的形成路径不同于5月。贝叶斯同位素混合模型计算结果显示:N_(2)O_(5)参与的路径(N_(2)O_(5)+H_(2)O/Cl-和NO_(3)^(+)VOCs)在3月和4月生成了37.2%和43.3%的硝酸盐,5月NO_(2)+·OH路径是硝酸盐的主要形成路径,形成了80.2%的硝酸盐。δ^(15)N-NO_(3)^(-)值和气团后向轨迹表明,东沙岛春季不同月份TSP中NO_(3)^(-)的来源不同,3月和4月以陆地源为主,5月主要受海洋源影响。 | 杨舒迪 罗笠 李宇笑 王晨 卢玢宇 许世杰 高树基 | 2023 | 地球环境学报2023，14，2： | 0 |
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