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Summertime fine particulate nitrate pollution in the North China Plain: increasing trends, formation mechanisms and implications for control policy

Atmospheric chemistry and physics, 2018-08, Vol.18 (15), p.11261-11275 [Peer Reviewed Journal]

COPYRIGHT 2018 Copernicus GmbH ;2018. This work is published under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 1680-7324 ;ISSN: 1680-7316 ;EISSN: 1680-7324 ;DOI: 10.5194/acp-18-11261-2018

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  • Title:
    Summertime fine particulate nitrate pollution in the North China Plain: increasing trends, formation mechanisms and implications for control policy
  • Author: Wen, Liang ; Xue, Likun ; Wang, Xinfeng ; Xu, Caihong ; Chen, Tianshu ; Yang, Lingxiao ; Wang, Tao ; Zhang, Qingzhu ; Wang, Wenxing
  • Subjects: Aerosols ; Air pollution ; Air pollution control ; Air quality ; Air quality management ; Airborne particulates ; Ammonia ; Central business districts ; Chemical pollution ; Control ; Environmental aspects ; Forecasts and trends ; Haze ; Methods ; Nitrates ; Nitrogen compounds ; Nitrogen dioxide ; Organic chemistry ; Oxides ; Particles ; Particulate matter ; Policies ; Pollution ; Ratios ; Spatial variations ; Sulfates ; Summer
  • Is Part Of: Atmospheric chemistry and physics, 2018-08, Vol.18 (15), p.11261-11275
  • Description: Nitrate aerosol makes up a significant fraction of fine particles and plays a key role in regional air quality and climate. The North China Plain (NCP) is one of the most industrialized and polluted regions in China. To obtain a holistic understanding of the nitrate pollution and its formation mechanisms over the NCP region, intensive field observations were conducted at three sites during summertime in 2014–2015. The measurement sites include an urban site in downtown Jinan – the capital city of Shandong Province –, a rural site downwind of Jinan city, and a remote mountain site at Mt. Tai (1534 m a.s.l.). Elevated nitrate concentrations were observed at all three sites despite distinct temporal and spatial variations. Using historical observations, the nitrate ∕ PM2.5 and nitrate ∕ sulfate ratios have statistically significantly increased in Jinan (2005–2015) and at Mt. Tai (from 2007 to 2014), indicating the worsening situation of regional nitrate pollution. A multiphase chemical box model (RACM–CAPRAM) was deployed and constrained by observations to elucidate the nitrate formation mechanisms. The principal formation route is the partitioning of gaseous HNO3 to the aerosol phase during the day, whilst the nocturnal nitrate formation is dominated by the heterogeneous hydrolysis of N2O5. The daytime nitrate production in the NCP region is mainly limited by the availability of NO2 and to a lesser extent by O3 and NH3. In comparison, the nighttime formation is controlled by both NO2 and O3. The presence of NH3 contributes to the formation of nitrate aerosol during the day, while there is slightly decreasing nitrate formation at night. Our analyses suggest that controlling NOx and O3 is an efficient way, at the moment, to mitigate nitrate pollution in the NCP region, where NH3 is usually in excess in summer. This study provides observational evidence of a rising trend of nitrate aerosol as well as scientific support for formulating effective control strategies for regional haze in China.
  • Publisher: Katlenburg-Lindau: Copernicus GmbH
  • Language: English
  • Identifier: ISSN: 1680-7324
    ISSN: 1680-7316
    EISSN: 1680-7324
    DOI: 10.5194/acp-18-11261-2018
  • Source: Geneva Foundation Free Medical Journals at publisher websites
    Alma/SFX Local Collection
    ProQuest Central
    DOAJ Directory of Open Access Journals
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