A re-evaluated Canadian ozonesonde record: measurements of the vertical  distribution of ozone over Canada from 1966 to 2013

Tarasick, D. W.; Davies, J.; Smit, H. G. J.; Oltmans, S. J.

doi:https://doi.org/10.5194/amt-9-195-2016

Articles | Volume 9, issue 1

https://doi.org/10.5194/amt-9-195-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue:

Changes in the vertical distribution of ozone – the SI2N report...

https://doi.org/10.5194/amt-9-195-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 9, issue 1

Research article

|

25 Jan 2016

Research article |

| 25 Jan 2016

A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013

D. W. Tarasick, J. Davies, H. G. J. Smit, and S. J. Oltmans

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Final revised paper (published on 25 Jan 2016)
Preprint (discussion started on 21 May 2015)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

RC C1576: 'ozonesonde data homogenization long term trends', Anonymous Referee #2, 17 Jun 2015
- AC C2963: 'Reply to Referee #2', David Tarasick, 14 Sep 2015
RC C2024: 'anonymous review', Anonymous Referee #1, 16 Jul 2015
- AC C2964: 'Reply to Referee #1', David Tarasick, 14 Sep 2015
AC C2962: 'Revised manuscript', David Tarasick, 14 Sep 2015

Short summary

Changes to measurement methods over Canada's 48-year ozonesonde record have been characterized and corrections applied. An estimate of the altitude-dependent uncertainty is added to each profile. The re-evaluated time series show negative trends in the lower stratosphere of up to 5 % per decade for the period 1966–2013. In the troposphere trends for the 48-year period are generally not significant. This suggests that free tropospheric ozone levels over Canada have not changed in nearly 50 years.