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@ARTICLE{Hegglin:62633,
      author       = {Hegglin, M. I. and Boone, C.D. and Manney, G. L. and
                      Shepherd, T. G. and Walker, K. A. and Bernath, P. F. and
                      Daffer, W. H. and Hoor, P. and Schiller, C.},
      title        = {{V}alidation of {ACE}-{FTS} satellite data in the upper
                      troposphere/lower stratosphere ({UTLS}) using non-coincident
                      measurements},
      journal      = {Atmospheric chemistry and physics},
      volume       = {8},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-62633},
      pages        = {1483 - 1499},
      year         = {2008},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {CO, O-3, and H2O data in the upper troposphere/lower
                      stratosphere (UTLS) measured by the Atmospheric Chemistry
                      Experiment Fourier Transform Spectrometer (ACE-FTS) on
                      Canada's SCISAT-1 satellite are validated using aircraft and
                      ozonesonde measurements. In the UTLS, validation of chemical
                      trace gas measurements is a challenging task due to
                      small-scale variability in the tracer fields, strong
                      gradients of the tracers across the tropopause, and scarcity
                      of measurements suitable for validation purposes. Validation
                      based on coincidences therefore suffers from geophysical
                      noise. Two alternative methods for the validation of
                      satellite data are introduced, which avoid the usual need
                      for coincident measurements: tracer-tracer correlations, and
                      vertical tracer profiles relative to tropopause height. Both
                      are increasingly being used for model validation as they
                      strongly suppress geophysical variability and thereby
                      provide an 'instantaneous climatology'. This allows
                      comparison of measurements between non-coincident data sets
                      which yields information about the precision and a
                      statistically meaningful error-assessment of the ACE-FTS
                      satellite data in the UTLS. By defining a trade-off factor,
                      we show that the measurement errors can be reduced by
                      including more measurements obtained over a wider longitude
                      range into the comparison, despite the increased geophysical
                      variability. Applying the methods then yields the following
                      upper bounds to the relative differences in the mean found
                      between the ACE-FTS and SPURT aircraft measurements in the
                      upper troposphere (UT) and lower stratosphere (LS),
                      respectively: for CO +/- $9\%$ and +/- $12\%,$ for H2O +/-
                      $30\%$ and +/- $18\%,$ and for O-3 +/- $25\%$ and +/-
                      $19\%.$ The relative differences for O-3 can be narrowed
                      down by using a larger dataset obtained from ozonesondes,
                      yielding a high bias in the ACE-FTS measurements of $18\%$
                      in the UT and relative differences of +/- $8\%$ for
                      measurements in the LS. When taking into account the
                      smearing effect of the vertically limited spacing between
                      measurements of the ACE-FTS instrument, the relative
                      differences decrease by $5-15\%$ around the tropopause,
                      suggesting a vertical resolution of the ACE-FTS in the UTLS
                      of around 1 km. The ACE-FTS hence offers unprecedented
                      precision and vertical resolution for a satellite
                      instrument, which will allow a new global perspective on
                      UTLS tracer distributions.},
      keywords     = {J (WoSType)},
      cin          = {ICG-1},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB790},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK406},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000254416700002},
      doi          = {10.5194/acp-8-1483-2008},
      url          = {https://juser.fz-juelich.de/record/62633},
}