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@ARTICLE{Rohrer:52283,
      author       = {Rohrer, F. and Berresheim, H.},
      title        = {{S}trong correlation between levels of tropospheric
                      hydroxyl radicals and solar ultraviolet radiation},
      journal      = {Nature},
      volume       = {442},
      issn         = {0028-0836},
      address      = {London [u.a.]},
      publisher    = {Nature Publising Group},
      reportid     = {PreJuSER-52283},
      pages        = {184 - 187},
      year         = {2006},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The most important chemical cleaning agent of the
                      atmosphere is the hydroxyl radical, OH. It determines the
                      oxidizing power of the atmosphere, and thereby controls the
                      removal of nearly all gaseous atmospheric pollutants. The
                      atmospheric supply of OH is limited, however, and could be
                      overcome by consumption due to increasing pollution and
                      climate change, with detrimental feedback effects. To date,
                      the high variability of OH concentrations has prevented the
                      use of local observations to monitor possible trends in the
                      concentration of this species. Here we present and analyse
                      long-term measurements of atmospheric OH concentrations,
                      which were taken between 1999 and 2003 at the Meteorological
                      Observatory Hohenpeissenberg in southern Germany. We find
                      that the concentration of OH can be described by a
                      surprisingly linear dependence on solar ultraviolet
                      radiation throughout the measurement period, despite the
                      fact that OH concentrations are influenced by thousands of
                      reactants. A detailed numerical model of atmospheric
                      reactions and measured trace gas concentrations indicates
                      that the observed correlation results from compensations
                      between individual processes affecting OH, but that a full
                      understanding of these interactions may not be possible on
                      the basis of our current knowledge of atmospheric chemistry.
                      As a consequence of the stable relationship between OH
                      concentrations and ultraviolet radiation that we observe, we
                      infer that there is no long-term trend in the level of OH in
                      the Hohenpeissenberg data set.},
      keywords     = {J (WoSType)},
      cin          = {ICG-II},
      ddc          = {070},
      cid          = {I:(DE-Juel1)VDB48},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK406},
      shelfmark    = {Multidisciplinary Sciences},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:16838018},
      UT           = {WOS:000238979700043},
      doi          = {10.1038/nature04924},
      url          = {https://juser.fz-juelich.de/record/52283},
}