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| Titel |
Estimating the climate significance of halogen-driven ozone loss in the tropical marine troposphere |
| VerfasserIn |
A. Saiz-Lopez, J.-F. Lamarque, D. E. Kinnison, S. Tilmes, C. Ordóñez, J. J. Orlando, A. J. Conley, J. M. C. Plane, A. S. Mahajan, G. Sousa Santos, E. L. Atlas, D. R. Blake, S. P. Sander, S. Schauffler, A. M. Thompson, G. Brasseur |
| 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 ; 12, no. 9 ; Nr. 12, no. 9 (2012-05-04), S.3939-3949 |
| Datensatznummer |
250011112
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| Publikation (Nr.) |
 copernicus.org/acp-12-3939-2012.pdf |
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| Zusammenfassung |
| We have integrated observations of tropospheric ozone, very short-lived
(VSL) halocarbons and reactive iodine and bromine species from a wide
variety of tropical data sources with the global CAM-Chem chemistry-climate
model and offline radiative transfer calculations to compute the
contribution of halogen chemistry to ozone loss and associated radiative
impact in the tropical marine troposphere. The inclusion of
tropospheric halogen chemistry in CAM-Chem leads to an annually averaged
depletion of around 10% (~2.5 Dobson units) of the tropical
tropospheric ozone column, with largest effects in the middle to upper
troposphere. This depletion contributes approximately −0.10 W m−2
to the radiative flux at the tropical tropopause.
This negative flux is of similar magnitude to the ~0.33 W m−2
contribution of tropospheric ozone to present-day radiative
balance as recently estimated from satellite observations. We
find that the implementation of oceanic halogen sources and chemistry in
climate models is an important component of the natural background ozone
budget and we suggest that it needs to be considered when estimating both
preindustrial ozone baseline levels and long term changes in
tropospheric ozone. |
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