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| Titel |
Chemical, physical, and optical evolution of biomass burning aerosols: a case study |
| VerfasserIn |
G. Adler, J. M. Flores, A. Abo Riziq, S. Borrmann, Y. Rudich |
| 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. 4 ; Nr. 11, no. 4 (2011-02-16), S.1491-1503 |
| Datensatznummer |
250009360
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| Publikation (Nr.) |
 copernicus.org/acp-11-1491-2011.pdf |
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| Zusammenfassung |
| In-situ chemical composition measurements of ambient aerosols have been used for
characterizing the evolution of submicron aerosols from a large
anthropogenic biomass burning (BB) event in Israel. A high resolution Time
of Flight Aerosol Mass Spectrometer (HR-RES-TOF-AMS) was used to follow the
chemical evolution of BB aerosols during a night-long, extensive nationwide
wood burning event and during the following day. While these types of
extensive BB events are not common in this region, burning of agricultural
waste is a common practice. The aging process of the BB aerosols was
followed through their chemical, physical and optical properties. Mass
spectrometric analysis of the aerosol organic component showed that aerosol
aging is characterized by shifting from less oxidized fresh BB aerosols to
more oxidized aerosols. Evidence for aerosol aging during the day following
the BB event was indicated by an increase in the organic mass, its oxidation
state, the total aerosol concentration, and a shift in the modal particle
diameter. The effective broadband refractive index (EBRI) was derived using
a white light optical particle counter (WELAS). The average EBRI for a mixed
population of aerosols dominated by open fires was m = 1.53(±0.03) + 0.07i(±0.03), during the smoldering phase of the fires we found
the EBRI to be m = 1.54(±0.01) + 0.04i(±0.01) compared to m = 1.49(±0.01) + 0.02i(±0.01) of the aged aerosols during the following day. This
change indicates a decrease in the overall aerosol absorption and
scattering. Elevated levels of particulate Polycyclic Aromatic Hydrocarbons
(PAHs) were detected during the entire event, which suggest possible
implications for human health during such extensive event. |
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