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@ARTICLE{Tarasick:281735,
      author       = {Tarasick, D. W. and Davies, J. and Smit, Herman G.J. and
                      Oltmans, S. J.},
      title        = {{A} re-evaluated {C}anadian ozonesonde record: measurements
                      of the vertical distribution of ozone over {C}anada from
                      1966 to 2013},
      journal      = {Atmospheric measurement techniques},
      volume       = {9},
      number       = {1},
      issn         = {1867-8548},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {FZJ-2016-01423},
      pages        = {195 - 214},
      year         = {2016},
      abstract     = {In Canada routine ozone soundings have been carried at
                      Resolute Bay since 1966, making this record the longest in
                      the world. Similar measurements started in the 1970s at
                      three other sites, and the network was expanded in stages to
                      10 sites by 2003. This important record for understanding
                      long-term changes in tropospheric and stratospheric ozone
                      has been re-evaluated as part of the
                      SPARC/IO3C/IGACO-O3/NDACC (SI2N) initiative. The
                      Brewer–Mast sonde, used in the Canadian network until
                      1980, is different in construction from the electrochemical
                      concentration cell (ECC) sonde, and the ECC sonde itself has
                      also undergone a variety of minor design changes over the
                      period 1980–2013. Corrections have been made for the
                      estimated effects of these changes to produce a more
                      homogeneous data set.The effect of the corrections is
                      generally modest. However, the overall result is entirely
                      positive: the comparison with co-located total ozone
                      spectrometers is improved, in terms of both bias and
                      standard deviation, and trends in the bias have been reduced
                      or eliminated. An uncertainty analysis (including the
                      additional uncertainty from the corrections, where
                      appropriate) has also been conducted, and the
                      altitude-dependent estimated uncertainty is included with
                      each revised profile.The resulting time series show negative
                      trends in the lower stratosphere of up to
                      $5 \% decade−1$ for the period 1966–2013. Most of
                      this decline occurred before 1997, and linear trends for the
                      more recent period are generally not significant. The time
                      series also show large variations from year to year. Some of
                      these anomalies can be related to cold winters (in the
                      Arctic stratosphere) or changes in the Brewer–Dobson
                      circulation, which may thereby be influencing trends.In the
                      troposphere, trends for the 48-year period are small and for
                      the most part not significant. This suggests that ozone
                      levels in the free troposphere over Canada have not changed
                      significantly in nearly 50 years.},
      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},
      UT           = {WOS:000375610500014},
      doi          = {10.5194/amt-9-195-2016},
      url          = {https://juser.fz-juelich.de/record/281735},
}