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@ARTICLE{Oswald:186715,
      author       = {Oswald, R. and Ermel, M. and Hens, K. and Novelli, A. and
                      Ouwersloot, H. G. and Paasonen, P. and Petäjä, T. and
                      Sipilä, M. and Keronen, P. and Bäck, J. and Königstedt,
                      R. and Hosaynali Beygi, Z. and Fischer, H. and Bohn, B. and
                      Kubistin, D. and Harder, H. and Martinez, M. and Williams,
                      J. and Hoffmann, T. and Trebs, I. and Sörgel, M.},
      title        = {{A} comparison of {HONO} budgets for two measurement
                      heights at a field station within the boreal forest in
                      {F}inland},
      journal      = {Atmospheric chemistry and physics},
      volume       = {15},
      number       = {2},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2015-00787},
      pages        = {799 - 813},
      year         = {2015},
      abstract     = {Atmospheric concentrations of nitrous acid (HONO), one of
                      the major precursors of the hydroxyl radical (OH) in the
                      troposphere, significantly exceed the values predicted by
                      the assumption of a photostationary state (PSS) during
                      daytime. Therefore, additional sources of HONO were
                      intensively investigated in the last decades. This study
                      presents budget calculations of HONO based on simultaneous
                      measurements of all relevant species, including HONO and OH
                      at two different measurement heights, i.e. 1 m above the
                      ground and about 2 to 3 m above the canopy (24 m above the
                      ground), conducted in a boreal forest environment. We
                      observed mean HONO concentrations of about 6.5 × 108
                      molecules cm−3 (26 ppt) during daytime, more than 20 times
                      higher than expected from the PSS of 0.2 × 108 molecules
                      cm−3 (1 ppt). To close the budgets at both heights, a
                      strong additional source term during daytime is required.
                      This unidentified source is at its maximum at noon (up to
                      1.1 × 106 molecules cm−3 s−1, 160 ppt h−1) and in
                      general up to 2.3 times stronger above the canopy than close
                      to the ground. The insignificance of known gas phase
                      reactions and other processes like dry deposition or
                      advection compared to the photolytic decomposition of HONO
                      at this measurement site was an ideal prerequisite to study
                      possible correlations of this unknown term to proposed HONO
                      sources. But neither the proposed emissions from soils nor
                      the proposed photolysis of adsorbed HNO3 contributed
                      substantially to the unknown source. However, the unknown
                      source was found to be perfectly correlated to the
                      unbalanced photolytic loss of HONO.},
      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:000351170000005},
      doi          = {10.5194/acp-15-799-2015},
      url          = {https://juser.fz-juelich.de/record/186715},
}