Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 5.509 IF 5.509
  • IF 5-year value: 5.689 IF 5-year
    5.689
  • CiteScore value: 5.44 CiteScore
    5.44
  • SNIP value: 1.519 SNIP 1.519
  • SJR value: 3.032 SJR 3.032
  • IPP value: 5.37 IPP 5.37
  • h5-index value: 86 h5-index 86
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 161 Scimago H
    index 161
Volume 11, issue 10
Atmos. Chem. Phys., 11, 4679-4686, 2011
https://doi.org/10.5194/acp-11-4679-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 11, 4679-4686, 2011
https://doi.org/10.5194/acp-11-4679-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 19 May 2011

Research article | 19 May 2011

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

D. M. Murphy1, J. C. Chow2, E. M. Leibensperger3, W. C. Malm4, M. Pitchford5, B. A. Schichtel6, J. G. Watson2, and W. H. White7 D. M. Murphy et al.
  • 1Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305, USA
  • 2Division of Atmospheric Sciences, Desert Research Institute, Reno Nevada, 89512, USA
  • 3School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
  • 4Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO 80523, USA
  • 5Air Resources Laboratory, National Oceanic and Atmospheric Administration, Las Vegas, NV 89119, USA
  • 6National Park Service, Colorado State University, Foothills Campus, Fort Collins, Colorado 80523, USA
  • 7Crocker Nuclear Laboratory, University of California Davis, Davis, CA 95616, USA

Abstract. 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.

Publications Copernicus
Download
Citation
Share