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| Titel |
Stratospheric ozone depletion from future nitrous oxide increases |
| VerfasserIn |
W. Wang, W. Tian, S. Dhomse, F. Xie, J. Shu, J. Austin |
| 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. 23 ; Nr. 14, no. 23 (2014-12-08), S.12967-12982 |
| Datensatznummer |
250119220
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| Publikation (Nr.) |
 copernicus.org/acp-14-12967-2014.pdf |
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| Zusammenfassung |
| We have investigated the impact of the assumed nitrous oxide
(N2O) increases on stratospheric chemistry and dynamics using
a series of idealized simulations with a coupled chemistry-climate model (CCM).
In a future cooler stratosphere
the net yield of NOy from N2O is shown to
decrease in a reference run following the IPCC A1B scenario, but NOy
can still be significantly increased by extra
increases of N2O over 2001–2050. Over the last decade of simulations,
50% increases in N2O result in a maximal 6% reduction in ozone mixing ratios
in the middle stratosphere at around 10 hPa and an average 2%
decrease in the total ozone column (TCO) compared with the control run.
This enhanced destruction could cause an ozone
decline in the first half of this century in the middle
stratosphere around 10 hPa, while global TCO still shows an increase at the same time.
The results from a multiple linear regression analysis and sensitivity simulations with different forcings show that
the chemical
effect of N2O increases dominates the N2O-induced ozone depletion in the
stratosphere, while the dynamical and radiative effects of
N2O increases are overall insignificant.
The analysis of the results reveals that the ozone depleting potential of N2O
varies with the time period and is influenced by the environmental conditions. For example, carbon dioxide (CO2) increases can strongly offset
the ozone depletion effect of N2O. |
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