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| Titel |
Aerosol particles in the Mexican East Pacific Part I: processing and vertical redistribution by clouds |
| VerfasserIn |
D. Baumgardner, G. B. Raga, J. C. Jimenez, K. Bower |
| 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 ; 5, no. 11 ; Nr. 5, no. 11 (2005-11-16), S.3081-3091 |
| Datensatznummer |
250003151
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| Publikation (Nr.) |
 copernicus.org/acp-5-3081-2005.pdf |
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| Zusammenfassung |
| Airborne measurements of aerosol particle size distributions were made in
the Mexican Intertropical Convergence Zone. The volume concentrations of submicron
and super micron particles at cloud base were compared with those in near-cloud regions over a range of altitudes. Of
78 near-cloud regions analyzed, 68% and 45% had enhanced volumes of
submicron particles and supermicron particles, respectively. In addition,
35% of these regions had supermicron particles removed, presumably by
precipitation. In 61% of the cases the enhancement in volume occurred
over the size range from 0.1 to 50 μm whereas only submicron volumes
were enhanced in 35% of the cases. In regions near clouds that were
formed in air of maritime origin the frequency of volume enhancement
decreased with increasing altitude and was twice as frequent on the dissipating
side of clouds compared to the growing side. No such differences were found in the
regions near clouds formed in air originating from the land. The frequency
and average magnitude of volume enhancement are in qualitative and
quantitative agreement with previous observational and theoretical studies
that relate enhancements in particle mass to the uptake by cloud droplets of
SO2 accompanied by additional growth by droplet coalescence. |
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