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@ARTICLE{Tan:862046,
      author       = {Tan, Zhaofeng and Lu, Keding and Jiang, Meiqing and Su,
                      Rong and Wang, Hongli and Lou, Shengrong and Fu, Qingyan and
                      Zhai, Chongzhi and Tan, Qinwen and Yue, Dingli and Chen,
                      Duohong and Wang, Zhanshan and Xie, Shaodong and Zeng, Limin
                      and Zhang, Yuanhang},
      title        = {{D}aytime atmospheric oxidation capacity in four {C}hinese
                      megacities during the photochemically polluted season: a
                      case study based on box model simulation},
      journal      = {Atmospheric chemistry and physics},
      volume       = {19},
      number       = {6},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2019-02412},
      pages        = {3493 - 3513},
      year         = {2019},
      abstract     = {Atmospheric oxidation capacity is the basis for converting
                      freshly emitted substances into secondary products and is
                      dominated by reactions involving hydroxyl radicals (OH)
                      during daytime. In this study, we present in situ
                      measurements of ROx radical (hydroxy OH, hydroperoxy HO2,
                      and organic peroxy RO2) precursors and products; the
                      measurements are carried out in four Chinese megacities
                      (Beijing, Shanghai, Guangzhou, and Chongqing) during
                      photochemically polluted seasons. The atmospheric oxidation
                      capacity is evaluated using an observation-based model and
                      radical chemistry precursor measurements as input. The
                      radical budget analysis illustrates the importance of HONO
                      and HCHO photolysis, which account for $∼50 \%$ of the
                      total primary radical sources. The radical propagation is
                      efficient due to abundant NO in urban environments. Hence,
                      the production rate of secondary pollutants, that is, ozone
                      (and fine-particle precursors (H2SO4, HNO3, and extremely
                      low volatility organic compounds, ELVOCs) is rapid,
                      resulting in secondary air pollution. The ozone budget
                      demonstrates its high production in urban areas; also, its
                      rapid transport to downwind areas results in rapid increase
                      in local ozone concentrations. The O3–NOx–VOC (volatile
                      organic compound) sensitivity tests show that ozone
                      production is VOC-limited and that alkenes and aromatics
                      should be mitigated first for ozone pollution control in the
                      four studied megacities. In contrast, NOx emission control
                      (that is, a decrease in NOx) leads to more severe ozone
                      pollution. With respect to fine-particle pollution, the role
                      of the HNO3–NO3 partitioning system is investigated using
                      a thermal dynamic model (ISORROPIA 2). Under high relative
                      humidity (RH) and ammonia-rich conditions, nitric acid
                      converts into nitrates. This study highlights the efficient
                      radical chemistry that maintains the atmospheric oxidation
                      capacity in Chinese megacities and results in secondary
                      pollution characterized by ozone and fine particles.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000461782400002},
      doi          = {10.5194/acp-19-3493-2019},
      url          = {https://juser.fz-juelich.de/record/862046},
}