Articles | Volume 18, issue 8
Atmos. Chem. Phys., 18, 5415–5453, 2018
https://doi.org/10.5194/acp-18-5415-2018

Special issue: Quadrennial Ozone Symposium 2016 – Status and trends...

Atmos. Chem. Phys., 18, 5415–5453, 2018
https://doi.org/10.5194/acp-18-5415-2018

Research article 20 Apr 2018

Research article | 20 Apr 2018

Climatology and long-term evolution of ozone and carbon monoxide in the upper troposphere–lower stratosphere (UTLS) at northern midlatitudes, as seen by IAGOS from 1995 to 2013

Yann Cohen et al.

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Latest update: 15 Jun 2021
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Short summary
Measurements of ozone and carbon monoxide were performed during 1994–2013 around the tropopause on board commercial aircraft. Seasonal cycles and trends were calculated above eight well-sampled regions in Northern Hemisphere midlatitudes. CO shows decreasing concentrations over the last 10 years, thus reflecting the impact of the legislation on anthropogenic emissions. Ozone amounts increased over the 20 years in the upper troposphere during different seasons, depending on the longitudes.
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