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@ARTICLE{Elshorbany:20058,
      author       = {Elshorbany, Y.F. and Kleffmann, J. and Hofzumahaus, A. and
                      Kurtenbach, R. and Wiesen, P. and Brauers, T. and Bohn, B.
                      and Dorn, H.-P. and Fuchs, H. and Holland, F. and Rohrer, F.
                      and Tillmann, R. and Wegener, R. and Wahner, A. and Kanaya,
                      Y. and Yoshino, A. and Hishida, S. and Kajii, Y. and
                      Martinez, M. and Kubistin, D. and Harder, H. and Lelieveld,
                      J. and Elste, T. and Plass-Dülmer, C. and Stange, G. and
                      Berresheim, H. and Schurath, U.},
      title        = {{HO}x budgets during {HO}x{C}omp: {A} case study of {HO}x
                      chemistry under {NO}x-limited conditions},
      journal      = {Journal of geophysical research / Atmospheres},
      volume       = {117},
      issn         = {0022-1406},
      address      = {Washington, DC},
      publisher    = {Union},
      reportid     = {PreJuSER-20058},
      pages        = {1 - 16},
      year         = {2012},
      note         = {This work was supported by the EU FP-6 program EUROCHAMP
                      (Integration of European Simulation Chambers for
                      Investigating Atmospheric Processes, grant
                      RII3-CT-2004-505968) and ACCENT (Priority 1.1.6.3. Global
                      Change and Ecosystems, grant GOCECT-2004-505337). We thank
                      F. J. Johnen for assistance with the experiments.},
      abstract     = {Recent studies have shown that measured OH under
                      NOx-limited, high-isoprene conditions are many times higher
                      than modeled OH. In this study, a detailed analysis of the
                      HOx radical budgets under low-NOx, rural conditions was
                      performed employing a box model based on the Master Chemical
                      Mechanism (MCMv3.2). The model results were compared with
                      HOx radical measurements performed during the international
                      HOxComp campaign carried out in Julich, Germany, during
                      summer 2005. Two different air masses influenced the
                      measurement site denoted as high-NOx (NO, 1-3 ppbv) and
                      low-NOx (NO, < 1 ppbv) periods. Both modeled OH and HO2
                      diurnal profiles lay within the measurement range of all HOx
                      measurement techniques, with correlation slopes between
                      measured and modeled OH and HO2 around unity. Recently
                      discovered interference in HO2 measurements caused by RO2
                      cross sensitivity was found to cause a $30\%$ increase in
                      measured HO2 during daytime on average. After correction of
                      the measured HO2 data, the model HO2 is still in good
                      agreement with the observations at high NOx but overpredicts
                      HO2 by a factor of 1.3 to 1.8 at low NOx. In addition, for
                      two different set of measurements, a missing OH source of
                      3.6 +/- 1.6 and 4.9 +/- 2.2 ppb h(-1) was estimated from the
                      experimental OH budget during the low-NOx period using the
                      corrected HO2 data. The measured diurnal profile of the
                      HO2/OH ratio, calculated using the corrected HO2, is well
                      reproduced by the MCM at high NOx but is significantly
                      overestimated at low NOx. Thus, the cycling between OH and
                      HO2 is better described by the model at high NOx than at low
                      NOx. Therefore, similar comprehensive field measurements
                      accompanied by model studies are urgently needed to
                      investigate HOx recycling under low-NOx conditions.},
      keywords     = {J (WoSType)},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000300231600001},
      doi          = {10.1029/2011JD017008},
      url          = {https://juser.fz-juelich.de/record/20058},
}