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| Titel |
Decreases in elemental carbon and fine particle mass in the United States |
| VerfasserIn |
D. M. Murphy, J. C. Chow, E. M. Leibensperger, W. C. Malm, M. Pitchford, B. A. Schichtel, J. G. Watson, W. H. White |
| 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. 10 ; Nr. 11, no. 10 (2011-05-19), S.4679-4686 |
| Datensatznummer |
250009747
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| Publikation (Nr.) |
 copernicus.org/acp-11-4679-2011.pdf |
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| Zusammenfassung |
| Observations at national parks and other remote sites show that average
elemental carbon and fine particle mass concentrations in the United States
both decreased by over 25 % between 1990 and 2004. Percentage decreases in
elemental carbon were much larger in winter than in summer. These data
suggest that emissions controls have been effective in reducing particulate
concentrations not only in polluted areas but also across the United States.
Despite the reduction in elemental carbon, the simultaneous decrease in
non-absorbing particles implies that the overall radiative forcing from
these changes was toward warming. The use of a 2005 instead of 1990 as a
baseline for climate-relevant emissions from the United States would imply a
significantly lower baseline for aerosol emissions. The use of older data
will overestimate the possibility for future reductions in warming due to
black carbon controls. |
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