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@ARTICLE{Krebsbach:50134,
      author       = {Krebsbach, M. and Schiller, C. and Brunner, D. and
                      Günther, G. and Hegglin, M. I. and Mottaghy, D. and Riese,
                      M. and Spelten, N. and Wernli, H.},
      title        = {{S}easonal cycles and variability of {O}3 and {H}2{O} in
                      the {UT}/{LMS} during {SPURT}},
      journal      = {Atmospheric chemistry and physics},
      volume       = {6},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-50134},
      pages        = {109 - 125},
      year         = {2006},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Airborne high resolution in situ measurements of a large
                      set of trace gases including ozone (O-3) and total water
                      (H2O) in the upper troposphere and the lowermost
                      stratosphere (UT/LMS) have been performed above Europe
                      within the SPURT project. SPURT provides an extensive data
                      coverage of the UT/LMS in each season within the time period
                      between November 2001 and July 2003.In the LMS a distinct
                      spring maximum and autumn minimum is observed in O-3,
                      whereas its annual cycle in the UT is shifted by 2-3 months
                      later towards the end of the year. The more variable H2O
                      measurements reveal a maximum during summer and a minimum
                      during autumn/winter with no phase shift between the two
                      atmospheric compartments.For a comprehensive insight into
                      trace gas composition and variability in the UT/LMS several
                      statistical methods are applied using chemical, thermal and
                      dynamical vertical coordinates. In particular, 2-dimensional
                      probability distribution functions serve as a tool to
                      transform localised aircraft data to a more comprehensive
                      view of the probed atmospheric region. It appears that both
                      trace gases, O-3 and H2O, reveal the most compact
                      arrangement and are best correlated in the view of potential
                      vorticity (PV) and distance to the local tropopause,
                      indicating an advanced mixing state on these surfaces. Thus,
                      strong gradients of PV seem to act as a transport barrier
                      both in the vertical and the horizontal direction. The
                      alignment of trace gas isopleths reflects the existence of a
                      year-round extra-tropical tropopause transition layer. The
                      SPURT measurements reveal that this layer is mainly affected
                      by stratospheric air during winter/spring and by
                      tropospheric air during autumn/summer.Normalised mixing
                      entropy values for O-3 and H2O in the LMS appear to be
                      maximal during spring and summer, respectively, indicating
                      highest variability of these trace gases during the
                      respective seasons.},
      keywords     = {J (WoSType)},
      cin          = {ICG-I / JARA-SIM},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB47 / I:(DE-Juel1)VDB1045},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK406},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000234892500001},
      url          = {https://juser.fz-juelich.de/record/50134},
}