% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Krasauskas:893938,
      author       = {Krasauskas, Lukas and Ungermann, Jörn and Preusse, Peter
                      and Friedl-Vallon, Felix and Zahn, Andreas and Ziereis,
                      Helmut and Rolf, Christian and Ploeger, Felix and Konopka,
                      Paul and Vogel, Bärbel and Riese, Martin},
      title        = {3-{D} tomographic observations of {R}ossby wave breaking
                      over the {N}orth {A}tlantic during the {WISE} aircraft
                      campaign in 2017},
      journal      = {Atmospheric chemistry and physics},
      volume       = {21},
      number       = {13},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2021-02944},
      pages        = {10249 - 10272},
      year         = {2021},
      abstract     = {This paper presents measurements of ozone, water vapour and
                      nitric acid (HNO3) in the upper troposphere/lower
                      stratosphere (UTLS) over North Atlantic and Europe. The
                      measurements were acquired with the Gimballed Limb Observer
                      for Radiance Imaging of the Atmosphere (GLORIA) during the
                      Wave Driven Isentropic Exchange (WISE) campaign in October
                      2017. GLORIA is an airborne limb imager capable of acquiring
                      both 2-D data sets (curtains along the flight path) and,
                      when the carrier aircraft is flying around the observed air
                      mass, spatially highly resolved 3-D tomographic data. Here,
                      we present a case study of a Rossby wave (RW) breaking event
                      observed during two subsequent flights 2 d apart. RW
                      breaking is known to steepen tracer gradients and facilitate
                      stratosphere–troposphere exchange (STE). Our measurements
                      reveal complex spatial structures in stratospheric tracers
                      (ozone and nitric acid) with multiple vertically stacked
                      filaments. Backward-trajectory analysis is used to
                      demonstrate that these features are related to several
                      previous Rossby wave breaking events and that the
                      small-scale structure of the UTLS in the Rossby wave
                      breaking region, which is otherwise very hard to observe,
                      can be understood as stirring and mixing of air masses of
                      tropospheric and stratospheric origin. It is also shown that
                      a strong nitric acid enhancement observed just above the
                      tropopause is likely a result of NOx production by lightning
                      activity. The measurements showed signatures of enhanced
                      mixing between stratospheric and tropospheric air near the
                      polar jet with some transport of water vapour into the
                      stratosphere. Some of the air masses seen in 3-D data were
                      encountered again 2 d later, stretched to very thin
                      filament (horizontal thickness down to 30 km at some
                      altitudes) rich in stratospheric tracers. This repeated
                      measurement allowed us to directly observe and analyse the
                      progress of mixing processes in a thin filament over 2 d.
                      Our results provide direct insight into small-scale dynamics
                      of the UTLS in the Rossby wave breaking region, which is of
                      great importance to understanding STE and poleward transport
                      in the UTLS.},
      cin          = {IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013},
      pnm          = {2112 - Climate Feedbacks (POF4-211) / 2A3 - Remote Sensing
                      (CARF - CCA) (POF4-2A3)},
      pid          = {G:(DE-HGF)POF4-2112 / G:(DE-HGF)POF4-2A3},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000671766300007},
      doi          = {10.5194/acp-21-10249-2021},
      url          = {https://juser.fz-juelich.de/record/893938},
}