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| Titel |
Contrasting organic aerosol particles from boreal and tropical forests during HUMPPA-COPEC-2010 and AMAZE-08 using coherent vibrational spectroscopy |
| VerfasserIn |
C. J. Ebben, I. S. Martinez, M. Shrestha, A. M. Buchbinder, A. L. Corrigan, A. Guenther, T. Karl, T. Petäjä, W. W. Song, S. R. Zorn, P. Artaxo, M. Kulmala  , S. T. Martin, L. M. Russell, J. Williams, F. M. Geiger |
| 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 ; 11, no. 20 ; Nr. 11, no. 20 (2011-10-17), S.10317-10329 |
| Datensatznummer |
250010129
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| Publikation (Nr.) |
 copernicus.org/acp-11-10317-2011.pdf |
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| Zusammenfassung |
| We present the vibrational sum frequency generation spectra of organic
particles collected in a boreal forest in Finland and a tropical forest in
Brazil. These spectra are compared to those of secondary organic material
produced in the Harvard Environmental Chamber. By comparing coherent
vibrational spectra of a variety of terpene and olefin reference compounds,
along with the secondary organic material synthesized in the environmental
chamber, we show that submicron aerosol particles sampled in Southern Finland
during HUMPPA-COPEC-2010 are composed to a large degree of material
similar in chemical composition to synthetic α-pinene-derived
material. For material collected in Brazil as part of AMAZE-08, the organic
component is found to be chemically complex in the coarse mode but highly
uniform in the fine mode. When combined with histogram analyses of the
isoprene and monoterpene abundance recorded during the HUMPPA-COPEC-2010 and
AMAZE-08 campaigns, the findings presented here indicate that if air is rich
in monoterpenes, submicron-sized secondary aerosol particles that form under
normal OH and O3 concentration levels can be described in terms of their
hydrocarbon content as being similar to α-pinene-derived model
secondary organic aerosol particles. If the isoprene concentration dominates
the chemical composition of organic compounds in forest air, then the
hydrocarbon component of secondary organic material in the submicron size
range is not simply well-represented by that of isoprene-derived model
secondary organic aerosol particles but is more complex. Throughout
the climate-relevant size range of the fine mode, however, we find that the
chemical composition of the secondary organic particle material from such air
is invariant with size, suggesting that the particle growth does not change
the chemical composition of the hydrocarbon component of the particles in a
significant way. |
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