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Global cloud condensation nuclei influenced by carbonaceous combustion aerosol

Spracklen, D, Carslaw, K, Pöschl, U, Rap, A and Forster, PM (2011) Global cloud condensation nuclei influenced by carbonaceous combustion aerosol. Atmospheric Chemistry and Physics, 11 (17). 9067 - 9087 . ISSN 1680-7324

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Abstract

Black carbon in carbonaceous combustion aerosol warms the climate by absorbing solar radiation, meaning reductions in black carbon emissions are often perceived as an attractive global warming mitigation option. However, carbonaceous combustion aerosol can also act as cloud condensation nuclei (particles upon which cloud drops form) so they also cool the climate by increasing cloud albedo. The net radiative effect of carbonaceous combustion aerosol is uncertain because their contribution to cloud drops has not been evaluated on the global scale. By combining extensive observations of cloud condensation nuclei concentrations and a global aerosol model, we show that carbonaceous combustion aerosol accounts for more than half of global cloud condensation nuclei. The evaluated model predicts that wildfire and pollution (fossil fuel and biofuel) carbonaceous combustion aerosol causes a global mean aerosol indirect effect of −0.34 W m−2 due to changes in cloud albedo, with pollution sources alone causing a global mean aerosol indirect effect of −0.23 W m−2. The small size of carbonaceous combustion particles from pollution sources means that whilst they account for only one-third of the emitted mass from these sources they cause two-thirds of the cloud albedo indirect effect that is due to carbonaceous combustion aerosol. This cooling effect must be accounted for to ensure that black carbon emissions controls that reduce the high number concentrations of small pollution particles have the desired net effect on climate.

Item Type: Article
Copyright, Publisher and Additional Information: © Author(s) 2011. This work is distributed under the Creative Commons Attribution 3.0 License.
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds)
Depositing User: Symplectic Publications
Date Deposited: 07 Sep 2011 10:23
Last Modified: 09 Jun 2014 07:10
Published Version: http://dx.doi.org/10.5194/acp-11-9067-2011
Status: Published
Publisher: European Geosciences Union
Identification Number: 10.5194/acp-11-9067-2011
URI: http://eprints.whiterose.ac.uk/id/eprint/43229

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