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@ARTICLE{Woiwode:156072,
      author       = {Woiwode, W. and Grooss, Jens-Uwe and Oelhaf, H. and
                      Molleker, S. and Borrmann, S. and Ebersoldt, A. and Frey, W.
                      and Gulde, T. and Khaykin, S. and Maucher, G. and Piesch, C.
                      and Orphal, J.},
      title        = {{D}enitrification by large {NAT} particles: the impact of
                      reduced settling velocities and hints on particle
                      characteristic},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {14},
      issn         = {1680-7367},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2014-04955},
      pages        = {5893-5927},
      year         = {2014},
      abstract     = {Vertical redistribution of HNO3 through condensation,
                      sedimentation and evaporation of large HNO3-containing
                      particles inside polar stratospheric clouds (PSCs) plays an
                      important role in the chemistry of the Arctic winter
                      stratosphere. In situ observations by the particle probe
                      FSSP-100 during the RECONCILE campaign indicate unexpected
                      large potential NAT (nitric acid trihydrate) particles
                      inside PSCs. The observations can hardly be explained
                      assuming particles with compact morphology and spherical
                      shape due to limited growing time at temperatures below the
                      existence temperature of NAT (TNAT). Utilizing simulations
                      by the CLaMS and measurements by the airborne Fourier
                      transform infrared spectrometer MIPAS-STR we study the
                      impact of reduced settling velocities of NAT particles on
                      vertical HNO3 redistribution. Reduced settling velocities
                      are expected for spherical NAT particles with low mass
                      density or aspheric NAT particles that might explain the
                      maximum sizes of the particles observed in situ. The results
                      of our study support the hypothesis that denitrification is
                      produced by significantly aspheric (i.e. columnar) compact
                      NAT particles which are characterised by reduced settling
                      velocities.},
      cin          = {IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013},
      pnm          = {234 - Composition and Dynamics of the Upper Troposphere and
                      Stratosphere (POF2-234)},
      pid          = {G:(DE-HGF)POF2-234},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acpd-14-5893-2014},
      url          = {https://juser.fz-juelich.de/record/156072},
}