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@ARTICLE{Hua:62343,
      author       = {Hua, W. and Chen, Z.M. and Jie, C.Y. and Kondo, Y. and
                      Hofzumahaus, A. and Takegawa, N. and Lu, K. and Miyazaki, Y.
                      and Kita, K. and Wang, H.L. and Zhang, Y. and Hu, M.},
      title        = {{A}tmospheric hydrogen peroxide and organic hydroperoxides
                      during {PRIDE}-{PRD}'06, {C}hina: their concentration,
                      formation mechanism and contribution to secondary aerosols},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {8},
      issn         = {1680-7367},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-62343},
      pages        = {10481 - 10530},
      year         = {2008},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Atmospheric hydrogen peroxide (H2O2) and organic
                      hydroperoxides were measured from 18 to 30 July in 2006
                      during the PRIDE-PRD'06 campaign at Backgarden, a rural site
                      located 48 km north of Guangzhou, a mega-city in southern
                      China. A ground-based instrument was used as a scrubbing
                      coil collector to sample ambient air, followed by on-site
                      analysis by high-performance liquid chromatography (HPLC)
                      coupled with post-column derivatization and fluorescence
                      detection. The H2O2 mixing ratio over the 13 days ranged
                      from below the detection limit to a maximum of 4.6 ppbv,
                      with a mean (and standard deviation) of (1.26 +/- 1.24) ppbv
                      during the daytime (08:00-20:00 LT). Methyl hydroperoxide
                      (MHP), with a maximum of 0.8 ppbv and a mean (and standard
                      deviation) of (0.28 +/- 0.10) ppbv during the daytime, was
                      the dominant organic hydroperoxide. Other organic peroxides,
                      including bis-hydroxymethyl hydroperoxide (BHMP),
                      peroxyacetic acid (PAA), hydroxymethyl hydroperoxide (HMHP),
                      1-hydroxy-ethyl hydroperoxide (1-HEHP) and ethyl
                      hydroperoxide (EHP), were detected occasionally. The
                      concentration of H2O2 exhibited a pronounced diurnal
                      variation on sunny days, with a peak mixing ratio in the
                      afternoon (12:00-18:00 LT), but lacked an explicit diurnal
                      cycle on cloudy days. Sometimes a second peak mixing ratio
                      of H2O2 was observed during the evening, suggesting that
                      H2O2 was produced by the ozonolysis of alkenes. The diurnal
                      variation profile of MHP was, in general, consistent with
                      that of H2O2. The estimation indicated that in the morning
                      the H2O2 detected was formed mostly through local
                      photochemical activity, with the rest probably attributable
                      to vertical transport. It is notable that relatively high
                      levels of H2O2 and MHP were found in polluted air. The
                      unexpectedly high level of HO2 radicals detected in this
                      region can account for the production of hydroperoxides,
                      while the moderate level of NOx suppressed the formation of
                      hydroperoxides. High concentrations of hydroperoxides were
                      detected in samples of rainwater collected in a heavy shower
                      on 25 July when a typhoon passed through, indicating that a
                      considerable mixing ratio of hydroperoxides, particularly
                      MHP, resided above the boundary layer, which might be
                      transported on a regional scale and further influence the
                      redistribution of HOx and ROx radicals. It was found that
                      hydroperoxides, in particular H2O2, play an important role
                      in the formation of secondary sulfate in the aerosol phase,
                      where the heterogeneous reaction might contribute
                      substantially. A negative correlation between hydroperoxides
                      and water-soluble organic compounds (WSOC), a considerable
                      fraction of the secondary organic aerosol (SOA), was
                      observed, possibly providing field evidence for the
                      importance of hydroperoxides in the formation of SOA found
                      in previous laboratory studies. We suggest that
                      hydroperoxides act as an important link between sulfate and
                      organic aerosols, which needs further study and should be
                      considered in current atmospheric models.},
      keywords     = {J (WoSType)},
      cin          = {ICG-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB791},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK406},
      typ          = {PUB:(DE-HGF)16},
      url          = {https://juser.fz-juelich.de/record/62343},
}