% 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{Hegglin:52916,
      author       = {Hegglin, M. I. and Brunner, D. and Peter, Th. and Hoor, P.
                      and Fischer, H. and Staehelin, J. and Krebsbach, M. and
                      Schiller, C. and Parchatka, U. and Weers, U.},
      title        = {{M}easurements of {NO}, {NO}y, {N}2{O}, and {O}3 during
                      {SPURT}: implications for transport and chemistry in the
                      lowermost stratosphere},
      journal      = {Atmospheric chemistry and physics},
      volume       = {6},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-52916},
      pages        = {1331 - 1350},
      year         = {2006},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {We present measurements of NO, NOy, O-3, and N2O within the
                      lowermost stratosphere ( LMS) over Europe obtained during
                      the SPURT project. The measurements cover all seasons
                      between November 2001 and July 2003. They span a broad band
                      of latitudes from 30 degrees N to 75 degrees N and a
                      potential temperature range from 290 to 380 K. The
                      measurements represent a comprehensive data set of these
                      tracers and reveal atmospheric transport processes that
                      influence tracer distributions in the LMS. Median mixing
                      ratios of stratospheric tracers in equivalent
                      latitude-potential temperature coordinates show a clear
                      seasonal cycle related to the Brewer-Dobson circulation,
                      with highest values in spring and lowest values in autumn.
                      Vertical tracer profiles show strong gradients at the
                      extratropical tropopause, suggesting that vertical
                      (cross-isentropic) mixing is reduced above the tropopause.
                      Pronounced meridional gradients in the tracer mixing ratios
                      are found on potential temperature surfaces in the LMS. This
                      suggests strongly reduced mixing along isentropes.
                      Concurrent large gradients in static stability in the
                      vertical direction, and of PV in the meridional direction,
                      suggest the presence of a mixing barrier. Seasonal cycles
                      were found in the correlation slopes Delta O-3/Delta N2O and
                      Delta NOy/Delta N2O well above the tropopause. Absolute
                      slope values are smallest in spring indicating chemically
                      aged stratospheric air originating from high altitudes and
                      latitudes. Larger values were measured in summer and autumn
                      suggesting that a substantial fraction of air takes a
                      "short-cut" from the tropical tropopause region into the
                      extratropical LMS. The seasonal change in the composition of
                      the LMS has direct implications for the ozone chemistry in
                      this region. Comparisons of measured NO with the critical NO
                      value at which net ozone production changes from negative to
                      positive, imply ozone production up to 20 K above the local
                      tropopause in spring, up to 30 K in summer, and up to 40 K
                      in autumn. Above these heights, and in winter, net ozone
                      production is negative.},
      keywords     = {J (WoSType)},
      cin          = {ICG-I},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB47},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK406},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000237060400002},
      url          = {https://juser.fz-juelich.de/record/52916},
}