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@ARTICLE{Tan:826194,
      author       = {Tan, Zhaofeng and Fuchs, Hendrik and Lu, Keding and
                      Hofzumahaus, Andreas and Bohn, Birger and Broch, Sebastian
                      and Dong, Huabin and Gomm, Sebastian and Häseler, Rolf and
                      He, Lingyan and Holland, Frank and Li, Xin and Liu, Ying and
                      Lu, Sihua and Rohrer, Franz and Shao, Min and Wang, Baolin
                      and Wang, Ming and Wu, Yusheng and Zeng, Limin and Zhang,
                      Yinsong and Wahner, Andreas and Zhang, Yuanhang},
      title        = {{R}adical chemistry at a rural site ({W}angdu) in the
                      {N}orth {C}hina {P}lain: observation and model calculations
                      of {OH}, {HO}2 and {RO}2 radicals},
      journal      = {Atmospheric chemistry and physics},
      volume       = {17},
      number       = {1},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2017-00440},
      pages        = {663 - 690},
      year         = {2017},
      abstract     = {comprehensive field campaign was carried out in summer 2014
                      in Wangdu, located in the North China Plain. A month of
                      continuous OH, HO2 and RO2 measurements was achieved.
                      Observations of radicals by the laser-induced fluorescence
                      (LIF) technique revealed daily maximum concentrations
                      between (5–15)  × 106 cm−3,
                      (3–14)  × 108 cm−3 and
                      (3–15)  × 108 cm−3 for OH, HO2 and RO2,
                      respectively. Measured OH reactivities (inverse OH lifetime)
                      were 10 to 20 s−1 during daytime. The chemical box model
                      RACM 2, including the Leuven isoprene mechanism (LIM), was
                      used to interpret the observed radical concentrations. As in
                      previous field campaigns in China, modeled and measured OH
                      concentrations agree for NO mixing ratios higher than
                      1 ppbv, but systematic discrepancies are observed in the
                      afternoon for NO mixing ratios of less than 300 pptv (the
                      model–measurement ratio is between 1.4 and 2 in this
                      case). If additional OH recycling equivalent to 100 pptv
                      NO is assumed, the model is capable of reproducing the
                      observed OH, HO2 and RO2 concentrations for conditions of
                      high volatile organic compound (VOC) and low NOx
                      concentrations. For HO2, good agreement is found between
                      modeled and observed concentrations during day and night. In
                      the case of RO2, the agreement between model calculations
                      and measurements is good in the late afternoon when NO
                      concentrations are below 0.3 ppbv. A significant model
                      underprediction of RO2 by a factor of 3 to 5 is found in the
                      morning at NO concentrations higher than 1 ppbv, which can
                      be explained by a missing RO2 source of 2 ppbv h−1. As
                      a consequence, the model underpredicts the photochemical net
                      ozone production by 20 ppbv per day, which is a
                      significant portion of the daily integrated ozone production
                      (110 ppbv) derived from the measured HO2 and RO2. The
                      additional RO2 production from the photolysis of ClNO2 and
                      missing reactivity can explain about $10 \%$ and $20 \%$
                      of the discrepancy, respectively. The underprediction of the
                      photochemical ozone production at high NOx found in this
                      study is consistent with the results from other field
                      campaigns in urban environments, which underlines the need
                      for better understanding of the peroxy radical chemistry for
                      high NOx conditions.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243)},
      pid          = {G:(DE-HGF)POF3-243},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000393892700003},
      doi          = {10.5194/acp-17-663-2017},
      url          = {https://juser.fz-juelich.de/record/826194},
}