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@ARTICLE{Mallik:857542,
      author       = {Mallik, Chinmay and Tomsche, Laura and Bourtsoukidis,
                      Efstratios and Crowley, John N. and Derstroff, Bettina and
                      Fischer, Horst and Hafermann, Sascha and Hüser, Imke and
                      Javed, Umar and Keßel, Stephan and Lelieveld, Jos and
                      Martinez, Monica and Meusel, Hannah and Novelli, Anna and
                      Phillips, Gavin J. and Pozzer, Andrea and Reiffs, Andreas
                      and Sander, Rolf and Taraborrelli, Domenico and Sauvage,
                      Carina and Schuladen, Jan and Su, Hang and Williams,
                      Jonathan and Harder, Hartwig},
      title        = {{O}xidation processes in the eastern {M}editerranean
                      atmosphere: evidence from the modelling of
                      ${HO}\<sub\>\<i\>x\</i\>\</sub\>$ measurements over
                      {C}yprus},
      journal      = {Atmospheric chemistry and physics},
      volume       = {18},
      number       = {14},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2018-06533},
      pages        = {10825 - 10847},
      year         = {2018},
      abstract     = {The Mediterranean is a climatically sensitive region
                      located at the crossroads of air masses from three
                      continents: Europe, Africa, and Asia. The chemical
                      processing of air masses over this region has implications
                      not only for the air quality but also for the long-range
                      transport of air pollution. To obtain a comprehensive
                      understanding of oxidation processes over the Mediterranean,
                      atmospheric concentrations of the hydroxyl radical (OH) and
                      the hydroperoxyl radical (HO2) were measured during an
                      intensive field campaign (CYprus PHotochemistry EXperiment,
                      CYPHEX-2014) in the northwest of Cyprus in the summer of
                      2014. Very low local anthropogenic and biogenic emissions
                      around the measurement location provided a vantage point to
                      study the contrasts in atmospheric oxidation pathways under
                      highly processed marine air masses and those influenced by
                      relatively fresh emissions from mainland Europe.The CYPHEX
                      measurements were used to evaluate OH and HO2 simulations
                      using a photochemical box model (CAABA/MECCA) constrained
                      with CYPHEX observations of O3, CO, NOx, hydrocarbons,
                      peroxides, and other major HOx (OH+HO2) sources and sinks in
                      a low-NOx environment (<100pptv of NO). The model
                      simulations for OH agreed to within $10\%$ with in situ OH
                      observations. Model simulations for HO2 agreed to within
                      $17\%$ of the in situ observations. However, the model
                      strongly under-predicted HO2 at high terpene concentrations,
                      this under-prediction reaching up to $38\%$ at the highest
                      terpene levels. Different schemes to improve the agreement
                      between observed and modelled HO2, including changing the
                      rate coefficients for the reactions of terpene-generated
                      peroxy radicals (RO2) with NO and HO2 as well as the
                      autoxidation of terpene-generated RO2 species, are explored
                      in this work. The main source of OH in Cyprus was its
                      primary production from O3 photolysis during the day and
                      HONO photolysis during early morning. Recycling contributed
                      about one-third of the total OH production, and the maximum
                      recycling efficiency was about 0.7. CO, which was the
                      largest OH sink, was also the largest HO2 source. The lowest
                      HOx production and losses occurred when the air masses had
                      higher residence time over the oceans.},
      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:000440515900001},
      doi          = {10.5194/acp-18-10825-2018},
      url          = {https://juser.fz-juelich.de/record/857542},
}