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| Titel |
Dust–air pollution dynamics over the eastern Mediterranean |
| VerfasserIn |
M. Abdelkader, S. Metzger, R. E. Mamouri, M. Astitha, L. Barrie, Z. Levin, 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 ; 15, no. 16 ; Nr. 15, no. 16 (2015-08-19), S.9173-9189 |
| Datensatznummer |
250119974
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| Publikation (Nr.) |
 copernicus.org/acp-15-9173-2015.pdf |
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| Zusammenfassung |
| Interactions of desert dust and air pollution over the eastern Mediterranean
(EM) have been studied, focusing on two distinct dust transport events on 22
and 28 September 2011. The atmospheric chemistry–climate model EMAC has been
used at about 50 km grid spacing, applying an online dust emission scheme
and calcium as a proxy for dust reactivity. EMAC includes a detailed
tropospheric chemistry mechanism, aerosol microphysics and thermodynamics
schemes to describe dust "aging". The model is evaluated using ground-based
observations for aerosol concentrations and aerosol optical depth (AOD) as well as
satellite observations. Simulation results and back trajectory analysis show
that the development of synoptic disturbances over the EM can enhance dust
transport from the Sahara and Arabian deserts in frontal systems that also
carry air pollution to the EM. The frontal systems are associated with
precipitation that controls the dust removal. Our results show the importance
of chemical aging of dust, which increases particle size, dust deposition
and scavenging efficiency during transport, overall reducing the lifetime
relative to non-aged dust particles. The relatively long travel periods of
Saharan dust result in more sustained aging compared to Arabian dust.
Sensitivity simulations indicate 3 times more dust deposition of aged
relative to pristine dust, which significantly decreases the dust lifetime
and loading. |
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