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| Titel |
A model study of ozone in the eastern Mediterranean free troposphere during MINOS (August 2001) |
| VerfasserIn |
G. J. Roelofs, H. A. Scheeren, J. Heland, H. Ziereis, J. Lelieveld  |
| 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 ; 3, no. 4 ; Nr. 3, no. 4 (2003-08-14), S.1199-1210 |
| Datensatznummer |
250001149
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| Publikation (Nr.) |
 copernicus.org/acp-3-1199-2003.pdf |
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| Zusammenfassung |
| A coupled tropospheric chemistry-climate model is used to analyze tropospheric
ozone distributions observed during the MINOS campaign in the eastern Mediterranean region (August, 2001). Modeled ozone profiles are generally in good
agreement with the observations. Our analysis shows that the atmospheric dynamics
in the region are strongly influenced by the occurrence of an upper tropospheric anti-cyclone, associated with the Asian summer monsoon and centered over the Tibetan
Plateau. The anti-cyclone affects the chemical composition of the upper troposphere,
where ozone concentrations of about 50 ppbv were measured, through advection of
boundary layer air from South-East Asia. A layer between 4-6 km thickness was
present beneath, containing up to 120 ppbv of ozone with substantial contributions by
transport from the stratosphere and through lightning NOx. Additionally, pollutant
ozone from North America was mixed in. Ozone in the lower troposphere originated
mainly from the European continent. The stratospheric influence may be overestimated due to too strong vertical diffusion associated with the relatively coarse
vertical resolution. The estimated tropospheric ozone column over the eastern
Mediterranean is ~50 DU in summer, to which ozone from recent stratospheric origin
contributes about 30%, ozone from lightning 13%, and from South-East Asia, North
America and Europe about 7%, 8% and 14%, respectively, adding to a long-term
hemispheric background of 25% of the column. |
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