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| Titel |
Atmospheric tar balls: aged primary droplets from biomass burning? |
| VerfasserIn |
Á. Tóth, A. Hoffer, I. Nyirő-Kósa, M. Pósfai, A. Gelencsér |
| 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 ; 14, no. 13 ; Nr. 14, no. 13 (2014-07-02), S.6669-6675 |
| Datensatznummer |
250118855
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| Publikation (Nr.) |
 copernicus.org/acp-14-6669-2014.pdf |
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| Zusammenfassung |
| Atmospheric tar balls are particles of special morphology and composition
that are fairly abundant in the plumes of biomass smoke. These particles
form a specific subset of brown carbon (BrC) which has been shown to play a
significant role in atmospheric shortwave absorption and, by extension, climate
forcing. Here we suggest that tar balls are produced by the direct emission
of liquid tar droplets followed by heat transformation upon biomass burning.
For the first time in atmospheric chemistry we generated tar-ball particles
from liquid tar obtained previously by dry distillation of wood in an
all-glass apparatus in the laboratory with the total exclusion of flame
processes. The particles were perfectly spherical with a mean optical
diameter of 300 nm, refractory, externally mixed, and homogeneous in the
contrast of the transmission electron microscopy (TEM) images.
They lacked any graphene-like microstructure and
exhibited a mean carbon-to-oxygen ratio of 10. All of the observed
characteristics of laboratory-generated particles were very similar to those
reported for atmospheric tar-ball particles in the literature, strongly
supporting our hypothesis regarding the formation mechanism of atmospheric
tar-ball particles. |
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