Atmos. Chem. Phys. Discuss., 12, 19987-20006, 2012
www.atmos-chem-phys-discuss.net/12/19987/2012/
doi:10.5194/acpd-12-19987-2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
The effects of hygroscopicity of fossil fuel combustion aerosols on mixed-phase clouds
Y. Yun1, J. E. Penner1, and O. Popovicheva2
1Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI 48105, USA
2D. V. Skobeltsyn Institute of Nuclear Physics, M.~V.~Lomonosov Moscow State University, Moscow, 119234, Russia

Abstract. Fossil fuel black carbon and organic matter (ffBC/OM) are often emitted together with sulfate, which coats the surface of these particles and changes their hygroscopicity. Observational studies show that the hygroscopicity of soot particles can modulate their ice nucleation ability. To address this, we implemented a scheme that uses 3 levels of soot hygroscopicity (hydrophobic, hydrophilic and hygroscopic) and used laboratory data to specify their ice nuclei abilities. The new scheme results in significant changes to anthropogenic forcing in mixed-phase clouds. The net forcing in off-line studies varies from 0.111 to 1.059 W m−2 depending on the ice nucleation capability of hygroscopic soot particles. The total anthropogenic cloud forcing and whole-sky forcing with the new scheme is 0.06 W m−2 and −2.45 W m−2, respectively, but could be more positive if hygroscopic soot particles are allowed to nucleate ice particles. The change in liquid water path dominates the anthropogenic forcing in mixed-phase clouds.

Citation: Yun, Y., Penner, J. E., and Popovicheva, O.: The effects of hygroscopicity of fossil fuel combustion aerosols on mixed-phase clouds, Atmos. Chem. Phys. Discuss., 12, 19987-20006, doi:10.5194/acpd-12-19987-2012, 2012.
 
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