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@INPROCEEDINGS{Petzold:890275,
      author       = {Petzold, Andreas and Rohs, Susanne and Rütimann, Mihal and
                      Neis, Patrick and Florian, Berkes and Herman, Smit and
                      Martina, Krämer and Nicole, Spelten and Peter, Spichtinger
                      and Philippe, Nedelec and Andreas, Wahner},
      title        = {{V}ertical distribution, seasonality and troposphericity of
                      icesupersaturated air masses in the northern mid-latitudes
                      from regular in-situ observations by passenger aircraft},
      reportid     = {FZJ-2021-00856},
      year         = {2020},
      abstract     = {<p>The vertical distribution and seasonal variation of
                      water vapour volume mixing ratio (H<sub>2</sub>O VMR),
                      relative humidity with respect to ice (RH<sub>ice</sub>) and
                      particularly of regions with ice-supersaturated air masses
                      (ISSR) in the extratropical upper troposphere and lowermost
                      stratosphere are investigated at northern mid-latitudes over
                      the regions Eastern North America, the North Atlantic and
                      Europe for the period 1995 to 2010.</p><p>Observation data
                      originate from regular and continuous long-term measurements
                      of H<sub>2</sub>O VMR, temperature and RH<sub>ice</sub> by
                      instrumented passenger aircraft in the framework of the
                      European research program MOZAIC which is continued as
                      European research infrastructure IAGOS (from 2011; see
                      www.iagos.org). The observation data are analysed with
                      respect to the thermal and dynamical tropopauses, as
                      provided by ERA-Interim. Additionally, collocated
                      O<sub>3</sub> observations from MOZAIC are used as tracer
                      for stratospheric air masses.</p><p>Our key results provide
                      in-depth insight into seasonal and regional variability and
                      tropospheric nature of ice-supersaturated air masses at
                      various distances from the tropopause layer. For the
                      vertical distribution and seasonal variation of ISSR
                      occurrence we show a comparison of our results to radio
                      soundings and to satellite observations of cirrus cloud
                      occurrence from AIRS and TOVs Path B instruments. Finally,
                      for all three regions, we investigate the trends and the
                      dependencies of ISSR occurrence on the North Atlantic
                      Oscillation (NAO) index.</p>},
      month         = {May},
      date          = {2020-05-04},
      organization  = {EGU 2020, Online (online), 4 May 2020
                       - 8 May 2020},
      subtyp        = {Other},
      cin          = {IEK-8},
      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)6},
      doi          = {10.5194/egusphere-egu2020-8992},
      url          = {https://juser.fz-juelich.de/record/890275},
}