Stratospheric ozone in the post-CFC era
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Author/Creator ORCID
Date
2009-03-24
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Citation of Original Publication
Li, F., Stolarski, R. S., and Newman, P. A.: Stratospheric ozone in the post-CFC era, Atmos. Chem. Phys., 9, 2207–2213, https://doi.org/10.5194/acp-9-2207-2009, 2009.
Rights
This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
Public Domain Mark 1.0
Public Domain Mark 1.0
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Abstract
Vertical and latitudinal changes in the stratospheric ozone in the post-chlorofluorocarbon (CFC) era are
investigated using simulations of the recent past and the 21st
century with a coupled chemistry-climate model. Model results reveal that, in the 2060s when the stratospheric halogen loading is projected to return to its 1980 values, the extratropical column ozone is significantly higher than that in
1975–1984, but the tropical column ozone does not recover
to 1980 values. Upper and lower stratospheric ozone changes
in the post-CFC era have very different patterns. Above
15 hPa ozone increases almost latitudinally uniformly by 6
Dobson Unit (DU), whereas below 15 hPa ozone decreases
in the tropics by 8 DU and increases in the extratropics by up
to 16 DU. The upper stratospheric ozone increase is a photochemical response to greenhouse gas induced strong cooling, and the lower stratospheric ozone changes are consistent
with enhanced mean advective transport due to a stronger
Brewer-Dobson circulation. The model results suggest that
the strengthening of the Brewer-Dobson circulation plays a
crucial role in ozone recovery and ozone distributions in the
post-CFC era.