Articles | Volume 9, issue 1
Atmos. Meas. Tech., 9, 195–214, 2016
https://doi.org/10.5194/amt-9-195-2016

Special issue: Changes in the vertical distribution of ozone – the SI2N report...

Atmos. Meas. Tech., 9, 195–214, 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 et al.

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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.