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| Titel |
Effects of stratospheric ozone recovery on photochemistry and ozone air quality in the troposphere |
| VerfasserIn |
H. Zhang, S. Wu, Y. Huang, Y. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 8 ; Nr. 14, no. 8 (2014-04-23), S.4079-4086 |
| Datensatznummer |
250118635
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| Publikation (Nr.) |
 copernicus.org/acp-14-4079-2014.pdf |
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| Zusammenfassung |
| There has been significant stratospheric ozone depletion since the late
1970s due to ozone-depleting substances (ODSs). With the implementation of
the Montreal Protocol and its amendments and adjustments, stratospheric
ozone is expected to recover towards its pre-1980 level in the coming
decades. In this study, we examine the implications of stratospheric ozone
recovery for the tropospheric chemistry and ozone air quality with a global
chemical transport model (GEOS-Chem). With a full recovery of the
stratospheric ozone, the projected increases in ozone column range from
1% over the low latitudes to more than 10% over the polar regions. The
sensitivity factor of troposphere ozone photolysis rate, defined as the
percentage changes in surface ozone photolysis rate for 1% increase in
stratospheric ozone column, shows significant seasonal variation but is
always negative with absolute value larger than one. The expected
stratospheric ozone recovery is found to affect the tropospheric ozone
destruction rates much more than the ozone production rates. Significant
decreases in surface ozone photolysis rates due to stratospheric ozone
recovery are simulated. The global average tropospheric OH decreases by
1.7%, and the global average lifetime of tropospheric ozone increases by
1.5%. The perturbations to tropospheric ozone and surface ozone show
large seasonal and spatial variations. General increases in surface ozone
are calculated for each season, with increases by up to 0.8 ppbv in the
remote areas. Increases in ozone lifetime by up to 13% are found in the
troposphere. The increased lifetimes of tropospheric ozone in response to
stratospheric ozone recovery enhance the intercontinental transport of ozone
and global pollution, in particular for the summertime. The global
background ozone attributable to Asian emissions is calculated to increase
by up to 15% or 0.3 ppbv in the Northern Hemisphere in response to the
projected stratospheric ozone recovery. |
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