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@ARTICLE{Lou:12502,
      author       = {Lou, S. and Holland, F. and Rohrer, F. and Lu, K. and Bohn,
                      B. and Brauers, T. and Chang, C.C. and Fuchs, H. and
                      Häseler, R. and Kita, K. and Kondo, Y. and Li, X. and Shao,
                      M. and Zeng, L. and Wahner, A. and Zhang, Y. and Wang, W.
                      and Hofzumahaus, A.},
      title        = {{A}tmospheric {OH} reactivities in the {P}earl {R}iver
                      {D}elta - {C}hina in summer 2006: measurement and model
                      results},
      journal      = {Atmospheric chemistry and physics},
      volume       = {10},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-12502},
      pages        = {11243 - 11260},
      year         = {2010},
      note         = {We thank the PRiDe PRD2006 campaign team (2002CB410801),
                      especially M. Hu, N. Takegawa, and A. Oebel for help and
                      support at the field site. We thank Pinhua Xie, Anhui
                      Institute of Optics and Fine Mechanics in Hefei, China, for
                      providing the methane data. C. C. thanks Academic Sinica,
                      Taiwan, for financial support of this work.},
      abstract     = {Total atmospheric OH reactivities (k(OH)) have been
                      measured as reciprocal OH lifetimes by a newly developed
                      instrument at a rural site in the densely populated Pearl
                      River Delta (PRD) in Southern China in summer 2006. The
                      deployed technique, LP-LIF, uses laser flash photolysis (LP)
                      for artificial OH generation and laser-induced fluorescence
                      (LIF) to measure the time-dependent OH decay in samples of
                      ambient air. The reactivities observed at PRD covered a
                      range from 10 s(-1) to 120 s(-1), indicating a large load of
                      chemical reactants. On average, k(OH) exhibited a pronounced
                      diurnal profile with a mean maximum value of 50 s(-1) at
                      daybreak and a mean minimum value of 20 s(-1) at noon. The
                      comparison of reactivities calculated from measured trace
                      gases with measured k(OH) reveals a missing reactivity of
                      about a factor of 2 at day and night. The reactivity
                      explained by measured trace gases was dominated by
                      anthropogenic pollutants (e. g., CO, NOx, light alkenes and
                      aromatic hydrocarbons) at night, while it was strongly
                      influenced by local, biogenic emissions of isoprene during
                      the day. Box model calculations initialized by measured
                      parameters reproduce the observed OH reactivity well and
                      suggest that the missing reactivity is contributed by
                      unmeasured, secondary chemistry products (mainly aldehydes
                      and ketones) that were photochemically formed by hydrocarbon
                      oxidation. Overall, k(OH) was dominated by organic
                      compounds, which had a maximum contribution of $85\%$ in the
                      afternoon. The paper demonstrates the usefulness of direct
                      reactivity measurements, emphasizes the need for direct
                      measurements of oxygenated organic compounds in atmospheric
                      chemistry studies, and discusses uncertainties of the
                      modelling of OVOC reactivities.},
      keywords     = {J (WoSType)},
      cin          = {IEK-8 / JARA-HPC},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013 / $I:(DE-82)080012_20140620$},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000284759500029},
      doi          = {10.5194/acp-10-11243-2010},
      url          = {https://juser.fz-juelich.de/record/12502},
}