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| Titel |
Modelling the chemically aged and mixed aerosols over the eastern central Atlantic Ocean – potential impacts |
| VerfasserIn |
M. Astitha, G. Kallos, C. Spyrou, W. O'Hirok, J. Lelieveld  , H. A. C. Denier van der Gon |
| 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 ; 10, no. 13 ; Nr. 10, no. 13 (2010-07-01), S.5797-5822 |
| Datensatznummer |
250008584
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| Publikation (Nr.) |
 copernicus.org/acp-10-5797-2010.pdf |
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| Zusammenfassung |
| Detailed information on the chemical and physical properties of aerosols is
important for assessing their role in air quality and climate. This work
explores the origin and fate of continental aerosols transported over the
Central Atlantic Ocean, in terms of chemical composition, number and size
distribution, using chemistry-transport models, satellite data and in situ
measurements. We focus on August 2005, a period with intense hurricane and
tropical storm activity over the Atlantic Ocean. A mixture of anthropogenic
(sulphates, nitrates), natural (desert dust, sea salt) and chemically aged
(sulphate and nitrate on dust) aerosols is found entering the hurricane
genesis region, most likely interacting with clouds in the area. Results
from our modelling study suggest rather small amounts of accumulation mode
desert dust, sea salt and chemically aged dust aerosols in this Atlantic
Ocean region. Aerosols of smaller size (Aitken mode) are more abundant in
the area and in some occasions sulphates of anthropogenic origin and desert
dust are of the same magnitude in terms of number concentrations. Typical
aerosol number concentrations are derived for the vertical layers near
shallow cloud formation regimes, indicating that the aerosol number
concentration can reach several thousand particles per cubic centimetre. The
vertical distribution of the aerosols shows that the desert dust particles
are often transported near the top of the marine cloud layer as they enter
into the region where deep convection is initiated. The anthropogenic
sulphate aerosol can be transported within a thick layer and enter the cloud
deck through multiple ways (from the top, the base of the cloud, and by
entrainment). The sodium (sea salt related) aerosol is mostly found below
the cloud base. The results of this work may provide insights relevant for
studies that consider aerosol influences on cloud processes and storm
development in the Central Atlantic region. |
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