Articles | Volume 15, issue 8
Atmos. Chem. Phys., 15, 4215–4224, 2015
https://doi.org/10.5194/acp-15-4215-2015

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

Atmos. Chem. Phys., 15, 4215–4224, 2015
https://doi.org/10.5194/acp-15-4215-2015

Research article 23 Apr 2015

Research article | 23 Apr 2015

The decrease in mid-stratospheric tropical ozone since 1991

G. E. Nedoluha et al.

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Short summary
While global stratospheric O3 has begun to recover, there are localized regions where O3 has decreased since 1991. O3 in the mid-stratosphere is very sensitive to nitrogen chemistry, with increased NOy resulting in decreased O3. We show how the observed O3 changes in the tropical mid-stratosphere can be caused by long-term variations in dynamics. These variations result in a decrease in N2O, an increase in NOy, and a resulting decrease in O3.
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