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| Titel |
Black carbon concentrations and sources in the marine boundary layer of the tropical Atlantic Ocean using four methodologies |
| VerfasserIn |
K. Pohl, M. Cantwell, P. Herckes, R. Lohmann |
| 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. 14 ; Nr. 14, no. 14 (2014-07-18), S.7431-7443 |
| Datensatznummer |
250118899
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| Publikation (Nr.) |
 copernicus.org/acp-14-7431-2014.pdf |
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| Zusammenfassung |
| Combustion-derived aerosols in the marine boundary layer have been poorly
studied, especially in remote environments such as the open Atlantic Ocean.
The tropical Atlantic has the potential to contain a high concentration of
aerosols, such as black carbon, due to the African emission plume of biomass
and agricultural burning products. Atmospheric particulate matter samples
across the tropical Atlantic boundary layer were collected in the summer of
2010 during the southern hemispheric dry season when open fire events were
frequent in Africa and South America. The highest black carbon
concentrations were detected in the Caribbean Sea and within the African
plume, with a regional average of 0.6 μg m−3 for both. The lowest
average concentrations were measured off the coast of South America at 0.2
to 0.3 μg m−3. Samples were quantified for black carbon using
multiple methods to provide insights into the form and stability of the
carbonaceous aerosols (i.e., thermally unstable organic carbon, soot like,
and charcoal like). Soot-like aerosols composed up to 45% of the
carbonaceous aerosols in the Caribbean Sea to as little as 4% within the
African plume. Charcoal-like aerosols composed up to 29% of the
carbonaceous aerosols over the oligotrophic Sargasso Sea, suggesting that
non-soot-like particles could be present in significant concentrations in
remote environments. To better apportion concentrations and forms of black
carbon, multiple detection methods should be used, particularly in regions
impacted by biomass burning emissions. |
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