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@ARTICLE{Gouget:44697,
      author       = {Gouget, H. and Vaughan, G. and Marenco, A. and Smit, H. G.
                      J.},
      title        = {{D}ecay of a cut-off low and contribution to
                      stratosphere-troposphere exchange},
      journal      = {Quarterly journal of the Royal Meteorological Society},
      volume       = {126},
      issn         = {0035-9009},
      address      = {Weinheim [u.a.]},
      publisher    = {Wiley},
      reportid     = {PreJuSER-44697},
      pages        = {S},
      year         = {2000},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {We present a case study of the decay of a cut-off low over
                      north-west Europe in June 1996, to establish how the
                      stratospheric air initially contained within it was
                      transferred to the troposphere. Two mechanisms for
                      stratosphere-troposphere exchange are examined: direct
                      convective erosion of the base of the low, and filamentation
                      of the outer layers of the low along the flank of the polar
                      jet stream. The approach taken relies on a combination of
                      in-situ ozone and humidity measurements by MOZAIC
                      (Measurement of Ozone and water Vapour by Airbus In-service
                      airCraft) aircraft and ozonesondes, and the European Centre
                      for Medium-Range Weather Forecasts analyses. MOZAIC ozone is
                      used to choose two analyses eight days apart at the genesis
                      (14 June 1996) and decay (22 June 1996) of the low which
                      have a consistent ozone/potential-vorticity relationship.
                      Trajectories (both isentropic and three dimensional (3D))
                      between these two analyses reveal a consistent pattern; at
                      the base of the low (310 K, 450 mb) all the trajectories
                      attain tropospheric PV values whereas, at 320 K, those
                      trajectories that leave the low experience a decrease in PV
                      and those that do not leave the low retain their initial PV.
                      We propose that air parcels leaving the low were stretched
                      into thin filaments along the flank of the jet stream, which
                      made them vulnerable to 3D mixing. A MOZAIC flight on 21
                      June 1996 provides direct evidence for this process.Up to 22
                      June 1996 (by which time the low had lost its closed
                      circulation) the satellite images showed very little
                      convection beneath the corresponding PV anomaly. Mixing was
                      only effective at the very base of the stratospheric air at
                      310 K. On 22 June the remaining remnant of high PV was
                      advected into a region of deep convection over central and
                      eastern Europe, mixing the remaining stratospheric air into
                      the troposphere. Of the initial mass of 10(15) kg of
                      stratospheric air contained in the low, 6 x 10(14) kg was
                      stripped into filaments along the jet and 4 x 10(14) kg,
                      remained to be mixed by convection during the period 22-23
                      June 1996.},
      keywords     = {J (WoSType)},
      cin          = {ICG-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB52},
      pnm          = {Chemie der Belasteten Atmosphäre},
      pid          = {G:(DE-Juel1)FUEK72},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000087057900013},
      url          = {https://juser.fz-juelich.de/record/44697},
}