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@ARTICLE{Berkes:837037,
      author       = {Berkes, Florian and Neis, Patrick and Schultz, Martin and
                      Bundke, Ulrich and Rohs, Susanne and Smit, Herman G.J. and
                      Wahner, Andreas and Konopka, Paul and Boulanger, Damien and
                      Nédélec, Philippe and Thouret, Valerie and Petzold,
                      Andreas},
      title        = {{T}wo decades of in-situ temperature measurements in the
                      upper troposphere and lowermost stratosphere from {IAGOS}
                      long-term routine observation},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {494},
      number       = {},
      issn         = {1680-7375},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2017-06050},
      pages        = {},
      year         = {2017},
      abstract     = {Despite several studies on temperature trends in the
                      tropopause region, a comprehensive understanding of the
                      evolution of temperatures in this climate-sensitive region
                      of the atmosphere remains elusive. Here we present a unique
                      global-scale, long-term data set of high-resolution in-situ
                      temperature data measured aboard passenger aircraft within
                      the European Research Infrastructure IAGOS (In-service
                      Aircraft for a Global Observing System, www.iagos.org). This
                      data set is used to investigate temperature trends within
                      the global upper troposphere and lowermost stratosphere
                      (UTLS) for the period 1995 to 2012 in different geographical
                      regions and vertical layers of the UTLS. The largest amount
                      of observations is available over the North Atlantic. Here,
                      a neutral temperature trend is found within the lowermost
                      stratosphere. This contradicts the temperature trend in the
                      European Centre for Medium Range Weather Forecast (ECMWF)
                      ERA-Interim reanalysis, where a significant $(95 \%$
                      confidence) temperature increase of +0.56 K/decade is
                      obtained. Differences between trends derived from
                      observations and reanalysis data can be traced back to
                      changes in the temperature bias between observation and
                      model data over the studied period. This study demonstrates
                      the value of the IAGOS temperature observations as anchor
                      point for the evaluation of reanalyses and its suitability
                      for independent trend analyses.},
      cin          = {IEK-8 / IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013 / I:(DE-Juel1)IEK-7-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-243 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acp-2017-494},
      url          = {https://juser.fz-juelich.de/record/837037},
}