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| Titel |
Sensitivity of stratospheric inorganic chlorine to differences in transport |
| VerfasserIn |
D. W. Waugh, S. E. Strahan, P. A. Newman |
| 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 ; 7, no. 18 ; Nr. 7, no. 18 (2007-09-26), S.4935-4941 |
| Datensatznummer |
250005203
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| Publikation (Nr.) |
 copernicus.org/acp-7-4935-2007.pdf |
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| Zusammenfassung |
| Correctly modeling stratospheric inorganic chlorine (Cly) is
crucial for modeling the past and future evolution of stratospheric
ozone. However, comparisons of the chemistry climate models used in
the latest international assessment of stratospheric ozone depletion
have shown large differences in the modeled Cly, with these
differences explaining many of the differences in the simulated evolution of
ozone over the next century. Here in, we examine the role of
transport in determining the simulated Cly using three simulations
from the same off-line chemical transport model that have the same
lower tropospheric boundary conditions and the same chemical solver,
but differing resolution and/or meteorological fields. These
simulations show that transport plays a key role in determining the
Cly distribution, and that Cly depends on both the time scales
and pathways of transport. The time air spends in the stratosphere
(e.g., the mean age) is an important transport factor determining
stratospheric Cly, but the relationship between mean age and Cly
is not simple. Lower stratospheric Cly depends on the fraction of
air that has been in the upper stratosphere, and transport
differences between models having the same mean age can result in
differences in the fraction of organic chlorine converted into
Cly. Differences in transport pathways result in differences in
vertical profiles of CFCs, and comparisons of observed and modeled
CFC profiles provide a stringent test of transport pathways in
models. |
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