Changes of Emission Sources to Nitrate Aerosols in Beijing After the Clean Air Actions: Evidence From Dual Isotope Compositions,Journal of Geophysical Research: Atmospheres

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Changes of Emission Sources to Nitrate Aerosols in Beijing After the Clean Air Actions: Evidence From Dual Isotope Compositions
Journal of Geophysical Research: Atmospheres ( IF 3.8 ) Pub Date : 2020-05-20 , DOI: 10.1029/2019jd031998
Mei‐Yi Fan _{1,

2,

3} , Yan‐Lin Zhang _{1,

2,

3} , Yu‐Chi Lin _{1,

2,

3} , Fang Cao _{1,

2,

3} , Zhu‐Yu Zhao _{1,

2,

3} , Yele Sun _{4,

5,

6} , Yanmei Qiu _{4,

5} , Pingqing Fu ₇ , Yuxuan Wang _{8,

9}

Affiliation

Yale‐NUIST Center on Atmospheric Environment, International Joint Laboratory on Climate and Environment ChangeNanjing University of Information Science and Technology Nanjing China
Key Laboratory Meteorological Disaster, Ministry of Education and Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisasterNanjing University of Information Science and Technology Nanjing China
Jiangsu Provincial Key Laboratory of Agricultural Meteorology, College of Applied MeteorologyNanjing University of Information Science and Technology Nanjing China
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric PhysicsChinese Academy of Sciences Beijing China
College of Earth and Planetary SciencesUniversity of Chinese Academy of Sciences Beijing China
Center for Excellence in Regional Atmospheric Environment, Institute of Urban EnvironmentChinese Academy of Sciences Xiamen China
Institute of Surface‐Earth System ScienceTianjin University Tianjin China
Department of Earth and Atmospheric SciencesUniversity of Houston Houston TX USA
Institute for Climate and Atmospheric ScienceUniversity of Houston Houston TX USA

Nitrate (NO₃⁻) is a major contributing species to haze formation in Northern China. So far, formation processes and source apportionments of nitrate aerosols during haze pollution have not yet been well understood. In this study, the PM_2.5 samples were collected in Beijing from 13 November to 24 December 2018. In addition to water‐soluble ions, oxygen (δ¹⁸O‐NO₃⁻) and nitrogen (δ¹⁵N‐NO₃⁻) isotopes in particulate NO₃⁻ were also determined, in order to investigate the formation pathways and potential sources of NO₃⁻ aerosols. The results showed that NO₃⁻ was a dominant species (43%) of secondary inorganic aerosols during the sampling period. The δ¹⁸O‐NO₃⁻ and δ¹⁵N‐NO₃⁻ values averaged at 83.8 ± 13.4 and 11.5 ± 5.0‰, respectively. Combining isotope compositions and Bayesian isotope mixing model, we found that heterogeneous reaction and gas phase oxidation contributed equally to nitrate formation during the sampling period. However, the contribution of heterogeneous processes to nitrate increased from 39% during the clean period to 64% during the haze period. On average, coal combustion, biomass burning, vehicle emissions, and soil emission contributed 50%, 26%, 20%, and 4%, respectively, to nitrate aerosols during the sampling period. Compared to the result in 2013, the significant decrease (~21%) of relative contribution of coal combustion to nitrate was due to strict reduction of coal consumption in Beijing. Finally, the relative contribution of traffic emissions to nitrate increased from 18% during the clean period to 30% during the haze period, suggesting that control of traffic emissions would be an important way to decrease nitrate concentrations and improve the air quality in Beijing.

更新日期：2020-05-20

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