% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Fuchs:151451,
      author       = {Fuchs, H. and Acir, I.-H. and Bohn, B. and Brauers, T. and
                      Dorn, H.-P. and Häseler, R. and Hofzumahaus, A. and
                      Holland, F. and Kaminski, M. and Li, Xin and Lu, K. and
                      Lutz, A. and Nehr, Sascha and Rohrer, F. and Tillmann, R.
                      and Wegener, R. and Wahner, A.},
      title        = {{OH} regeneration from methacrolein oxidation investigated
                      in the atmosphere simulation chamber {SAPHIR}},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {14},
      number       = {4},
      issn         = {1680-7375},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2014-01397},
      pages        = {5197 - 5231},
      year         = {2014},
      abstract     = {Hydroxyl radicals (OH) are the most important reagent for
                      the oxidation of trace gases in the atmosphere. OH
                      concentrations measured during recent field campaigns in
                      isoprene rich environments were unexpectedly large. A number
                      of studies showed that unimolecular reactions of organic
                      peroxy radicals (RO2) formed in the initial reaction step of
                      isoprene with OH play an important role for the OH budget in
                      the atmosphere at low mixing ratios of nitrogen monoxide
                      (NO) of less than 100 pptv. It has also been suggested that
                      similar reactions potentially play an important role for RO2
                      from other compounds. Here, we investigate the oxidation of
                      methacrolein (MACR), one major oxidation product of
                      isoprene, by OH in experiments in the simulation chamber
                      SAPHIR under controlled atmospheric conditions. The
                      experiments show that measured OH concentrations are
                      approximately $50\%$ larger than calculated by current
                      chemical models for conditions of the experiments (NO mixing
                      ratio of 90 pptv). The analysis of the OH budget reveals a
                      so far unaccounted OH source, which is correlated with the
                      production rate of RO2 radicals from MACR. In order to
                      balance the measured OH destruction rate, (0.77±0.3) OH
                      radicals need to be additionally reformed from each OH that
                      has reacted with MACR. The strong correlation of the missing
                      OH source with the production of RO2 radicals is consistent
                      with the concept of OH formation from unimolecular
                      isomerization and decomposition reactions of RO2. The
                      comparison of observations with model calculations gives a
                      lower limit of 0.03 s−1 for the reaction rate constant, if
                      the OH source is attributed to an isomerization reaction of
                      one RO2 species formed in the MACR+OH reaction as suggested
                      in literature. This fast isomerization reaction would be
                      competitive to the reaction of this RO2 species with minimum
                      150 pptv NO},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {233 - Trace gas and aerosol processes in the troposphere
                      (POF2-233) / 243 - Tropospheric trace substances and their
                      transformation processes (POF3-243) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF2-233 / G:(DE-HGF)POF3-243 /
                      G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acpd-14-5197-2014},
      url          = {https://juser.fz-juelich.de/record/151451},
}