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@ARTICLE{Reutter:866945,
      author       = {Reutter, P. and Neis, Patrick and Rohs, Susanne and
                      Sauvage, B.},
      title        = {{C}omparison of {IAGOS} in-situ water vapour measurements
                      and {ECMWF} {ERA}-{I}nterim {R}eanalysis data},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {573},
      issn         = {1680-7367},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2019-05992},
      pages        = {},
      year         = {2019},
      abstract     = {Abstract. Cirrus clouds and their potential formation
                      regions, so-called ice-supersaturated regions (ISSRs) occur
                      frequently in the tropopause region. It is assumed that
                      ISSRs and cirrus clouds can change the tropopause structure
                      by diabatic processes, driven by latent heating due to phase
                      transition and interaction with radiation. For many research
                      questions a three-dimensional picture including a sufficient
                      temporal resolution of the water vapour fields in the
                      tropopause region is required. This requirement is fulfilled
                      nowadays by reanalysis products such as the European Centre
                      for Medium-Range Weather Forecasts (ECMWF) ERA-Interim
                      reanalysis. However, for a meaningful investigation of water
                      vapour in the tropopause region a comparison of the
                      reanalysis data with measurement is advisable, since it is
                      difficult to measure water vapour and to assimilate
                      meaningful measurements into reanalysis products. Here, we
                      present an intercomparison of high-resolution in-situ
                      measurements aboard passenger aircraft within the European
                      Research Infrastructure IAGOS (In-service Aircraft for a
                      Global Observing System; http://www.iagos.org) with
                      ERA-Interim. Temperature and humidity data over the North
                      Atlantic from 2000 to 2010 are compared relative to the
                      dynamical tropopause. The comparison of the temperature
                      shows a good agreement between measurement and ERA-Interim.
                      While ERA-Interim can reproduce the main features of the
                      water vapour measurements of IAGOS, the variability of the
                      data is underestimated by the reanalysis data. The
                      combination of temperature and water vapour leads to the
                      relative humidity with respect to ice (RHi). Here
                      ERA-Interim deviates from the measurements concerning values
                      of larger than RHi=100 $\%,$ both in number and strength of
                      supersaturation. The comparison of ISSR pathlengths shows
                      distinct differences, which can be traced back to the
                      spatial resolution of both data sets. IAGOS shows
                      significantly more smaller ISSRs compared to ERA-Interim. A
                      good agreement begins only at pathlengths in the order of
                      the ERA-Interim spatial resolution and larger.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243)},
      pid          = {G:(DE-HGF)POF3-243},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acp-2019-573},
      url          = {https://juser.fz-juelich.de/record/866945},
}