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| Titel |
Steady-state aerosol distributions in the extra-tropical, lower stratosphere and the processes that maintain them |
| VerfasserIn |
J. C. Wilson, S.-H. Lee, J. M. Reeves, C. A. Brock, H. H. Jonsson, B. G. Lafleur, M. Loewenstein, J. Podolske, E. Atlas, K. Boering, G. Toon, D. Fahey, T. P. Bui, G. Diskin, F. Moore |
| 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 ; 8, no. 22 ; Nr. 8, no. 22 (2008-11-17), S.6617-6626 |
| Datensatznummer |
250006453
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| Publikation (Nr.) |
 copernicus.org/acp-8-6617-2008.pdf |
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| Zusammenfassung |
| Measurements of aerosol, N2O and OCS made in the Northern Hemisphere
below 21 km altitude following the eruption of Pinatubo are presented and
analyzed. After September 1999, the oxidation of OCS and sedimentation of
particles in the extra-tropical overworld north of 45 N are found to
maintain the aerosol in a steady state. This analysis empirically links
precursor gas to aerosol abundance throughout this region. These processes
are tracked with age-of-air which offers advantages over tracking as a
function of latitude and altitude. In the extra-tropical, lowermost
stratosphere, normalized volume distributions appear constant in time after
the fall of 1999. Exchange with the troposphere is important in
understanding aerosol evolution there. Size distributions of volcanically
perturbed aerosol are included to distinguish between volcanic and
non-volcanic conditions. This analysis suggests that model failures to
correctly predict OCS and aerosol properties below 20 km in the Northern Hemisphere extra tropics result from inadequate descriptions of atmospheric
circulation. |
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