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| Titel |
Anthropogenic and forest fire pollution aerosol transported to the Arctic: observations from the POLARCAT-France spring campaign |
| VerfasserIn |
B. Quennehen, A. Schwarzenboeck, A. Matsuki, J. F. Burkhart, A. Stohl, G. Ancellet, K. S. Law |
| 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 ; 12, no. 14 ; Nr. 12, no. 14 (2012-07-24), S.6437-6454 |
| Datensatznummer |
250011336
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| Publikation (Nr.) |
 copernicus.org/acp-12-6437-2012.pdf |
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| Zusammenfassung |
During the POLARCAT-France airborne measurement campaign in spring 2008,
several pollution plumes transported from mid-latitude regions were
encountered. The study presented here focuses on air masses from two
different geographic origins (Europe and Asia) and from 2 different source
types (anthropogenic pollution and forest fires). A first case study is
dedicated to a European air mass, which was repeatedly sampled and analysed
during three consecutive days. Thereby, the evolution of the aerosol
properties (size distributions, CO mixing ratio) is characterised and related
processes are discussed. In particular, the role of coagulation,
condensation and cloud processing in the evolution of the Aitken and the
accumulation mode particles are contrasted.
A second case study focuses on European air masses impacted solely by biomass
burning emissions and Asian air masses with contributions from both biomass
burning and anthropogenic emissions. The analysis of aerosol modes highlight
a similar behaviour for particle originating from biomass burning (from Europe
as well as Asia). In comparison to the predominating aged accumulation mode
in biomass burning particles, a still larger aerosol accumulation mode
related to Asian anthropogenic emissions can be isolated. These findings
corroborate the external mixing of such kind of aerosol size distributions.
An electron microscopy study (coupled to X-ray elemental analysis) of
particles illustrated soot-like inclusions in several samples. Within samples
attributed to forest fire sources, the chemical signature is highly
associated with the presence of potassium, which is a characteristic tracer
element for biomass burning plumes. The single particle images suggest an
internal mixing of sampled individual aerosol particles. Thus, particles are
found externally mixed as demonstrated from particle size distributions while
they appear internally mixed at the particle scale. |
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