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| Titel |
GCCN and IN activity of primary biological particles collected during wet season in the Amazonian tropical rain forest (Manaus, Brazil) - a single particle SEM study |
| VerfasserIn |
A. Snee-Pollmann, B. W. Sinha, J. Huth, P. Hoppe, W. Elbert, A. G. Wollny, R. M. Garland, A. J. Prenni, S. M. King, E. Mikhailov |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250023358
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| Zusammenfassung |
| Single particle analysis of primary biological particles was performed on samples collected in
the tropical rain forest (Manaus, Brazil) during the AMAZE campaign in February and
March 2008. During wet season, Amazonia is one of the few places on Earth where natural
continental aerosol unperturbed by anthropogenic influences can be investigated. Under
conditions when influence from outside the Amazon basin is minor, coarse mode aerosol is
dominated by primary biological particles. We observe a significant fraction of primary
biogenic particles show organic coatings, or mixed coatings with water soluble
organics and inorganic salt and/or mineral dust, indicating they underwent wet
processing. The abundance of such coatings varies strongly for morphologically
distinct types of primary biogenic particles, from less than 10% for some primary
biogenic particles to more than 95% for other particle types. While primary biogenic
particles with a high frequency of coatings are likely to act as large or giant cloud
condensation nuclei (GCCN), primary biogenic particles that do not display such
coatings can act as ice nuclei (IN). For the first time we present field evidence for
the efficiency of different primary biological particles to act as GCCN and IN by
identifying primary biological particles based on the SEM micrographs and observing
the frequency of coatings acquired through wet processing for different particle
types. |
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