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Decreases in Elemental Carbon and Fine Particle Mass in the United States : Volume 11, Issue 1 (20/01/2011)

By Murphy, D. M.

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Book Id: WPLBN0003991016
Format Type: PDF Article :
File Size: Pages 20
Reproduction Date: 2015

Title: Decreases in Elemental Carbon and Fine Particle Mass in the United States : Volume 11, Issue 1 (20/01/2011)  
Author: Murphy, D. M.
Volume: Vol. 11, Issue 1
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Malm, W. C., Chow, J. C., Schichtel, B. A., Leibensperger, E. M., Watson, J. G., Pitchford, M.,...White, W. H. (2011). Decreases in Elemental Carbon and Fine Particle Mass in the United States : Volume 11, Issue 1 (20/01/2011). Retrieved from http://www.ebooklibrary.org/


Description
Description: Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305, USA. 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.

Summary
Decreases in elemental carbon and fine particle mass in the United States

Excerpt
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