Affiliation:
1. Center for International Climate and Environmental Research–Oslo (CICERO), Post Office Box 1129 Blindern, N-0318 Oslo, Norway.
Abstract
Cooling Down
Some aerosols, such as sulfates, reflect solar radiation and have a cooling effect on climate, while others, such as black carbon, have a warming effect because they absorb solar radiation. The preponderance of reflective aerosols causes the net effect to be one of cooling, but the amount of cooling is uncertain, owing to a large difference in estimates of the effect of aerosols in global aerosol models compared with estimates based on observations.
Myhre
(p.
187
, published online 18 June; see the Perspective by
Quaas
) uses a combination of observational data and modeling to reconcile the two approaches, drawing particular attention to relative increases in the aerosol fraction of black carbon. Taken together, the results suggest a best estimate of the cooling effect of aerosols that is 60% of previous reports.
Publisher
American Association for the Advancement of Science (AAAS)
Reference24 articles.
1. P. Forster et al . in Climate Change 2007: The Physical Science Basis—Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change S. Solomon et al. Eds. (Cambridge Univ. Press New York 2007) pp. 129–134.
2. A satellite view of aerosols in the climate system
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5. On avoiding dangerous anthropogenic interference with the climate system: Formidable challenges ahead
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