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| Titel |
Implementing marine organic aerosols into the GEOS-Chem model |
| VerfasserIn |
B. Gantt, M. S. Johnson, M. Crippa, A. S. H. Prévôt, N. Meskhidze |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 8, no. 3 ; Nr. 8, no. 3 (2015-03-17), S.619-629 |
| Datensatznummer |
250116180
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| Publikation (Nr.) |
 copernicus.org/gmd-8-619-2015.pdf |
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| Zusammenfassung |
| Marine-sourced organic aerosols (MOAs) have been shown to play an important
role in tropospheric chemistry by impacting surface mass, cloud condensation
nuclei, and ice nuclei concentrations over remote marine and coastal
regions. In this work, an online marine primary organic aerosol emission
parameterization, designed to be used for both global and regional models,
was implemented into the GEOS-Chem (Global Earth Observing System
Chemistry) model. The implemented emission scheme
improved the large underprediction of organic aerosol concentrations in
clean marine regions (normalized mean bias decreases from −79% when using
the default settings to −12% when marine organic aerosols are added).
Model predictions were also in good agreement (correlation coefficient of
0.62 and normalized mean bias of −36%) with hourly surface concentrations
of MOAs observed during the summertime at an inland site near Paris, France.
Our study shows that MOAs have weaker coastal-to-inland concentration
gradients than sea-salt aerosols, leading to several inland European cities
having >10% of their surface submicron organic aerosol mass
concentration with a marine source. The addition of MOA tracers to GEOS-Chem
enabled us to identify the regions with large contributions of
freshly emitted or aged aerosol having distinct physicochemical properties,
potentially indicating optimal locations for future field studies. |
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