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Published May 2010 | Published
Journal Article Open

Will black carbon mitigation dampen aerosol indirect forcing?


[1] If mitigation of black carbon (BC) particulate matter is accompanied by a decrease in particle number emissions, and thereby by a decrease in global cloud condensation nuclei (CCN) concentrations, a decrease in global cloud radiative forcing (a reverse "cloud albedo effect") results. We consider two present-day mitigation scenarios: 50% reduction of primary black carbon/organic carbon (BC/OC) mass and number emissions from fossil fuel combustion (termed HF), and 50% reduction of primary BC/OC mass and number emissions from all primary carbonaceous sources (fossil fuel, domestic biofuel, and biomass burning) (termed HC). Radiative forcing effects of these scenarios are assessed through present-day equilibrium climate simulations. Global average top-of-the-atmosphere changes in radiative forcing for the two scenarios, relative to present day conditions, are +0.13 ± 0.33 W m^(−2) (HF) and + 0.31 ± 0.33 W m^(−2) (HC).

Additional Information

© 2010 by the American Geophysical Union. Received 16 February 2010; accepted 29 March 2010; published 1 May 2010. This work was supported by the U.S. Environmental Protection Agency under Science To Achieve Results (STAR) grant RD83337001 and NASA grant NNX08AL85G.

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