Articles | Volume 9, issue 1
https://doi.org/10.5194/amt-9-195-2016
https://doi.org/10.5194/amt-9-195-2016
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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Cited articles

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Beekmann, M., Ancellet, G., Mégie, G., Smit, H. G. J., and Kley, D.: Intercomparison campaign of vertical ozone profiles including electrochemical sondes of ECC and Brewer–Mast type and a ground-based UV-differential absorption lidar,  J. Atmos. Chem., 19, 259–288, 1994.
Beekmann, M., Ancellet, G., Martin, D., Abonnel, C., Duverneuil, G., Eideliman, F., Bessemoulin, P., Fritz, N., and Girard, E.: Intercomparison of tropospheric ozone profiles obtained by electrochemical sondes, a ground-based lidar and an airborne UV-photometer, Atmos. Environ., 29, 1027–1042, 1995.
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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.