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ACP | Articles | Volume 19, issue 11
Atmos. Chem. Phys., 19, 7507–7518, 2019
https://doi.org/10.5194/acp-19-7507-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Atmos. Chem. Phys., 19, 7507–7518, 2019
https://doi.org/10.5194/acp-19-7507-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 05 Jun 2019

Research article | 05 Jun 2019

Optically effective complex refractive index of coated black carbon aerosols: from numerical aspects

Xiaolin Zhang et al.

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Revised manuscript accepted for ACP
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Abo Riziq, A., Erlick, C., Dinar, E., and Rudich, Y.: Optical properties of absorbing and non-absorbing aerosols retrieved by cavity ring down (CRD) spectroscopy, Atmos. Chem. Phys., 7, 1523–1536, https://doi.org/10.5194/acp-7-1523-2007, 2007. 
Adachi, K. and Buseck, P. R.: Internally mixed soot, sulfates, and organic matter in aerosol particles from Mexico City, Atmos. Chem. Phys., 8, 6469–6481, https://doi.org/10.5194/acp-8-6469-2008, 2008. 
Alexander, D. T. L., Crozier, P. A., and Anderson, J. R.: Brown Carbon Spheres in East Asian Outflow and their Optical Properties, Science, 321, 833–836, 2008. 
Aouizerats, B., Thouron, O., Tulet, P., Mallet, M., Gomes, L., and Henzing, J. S.: Development of an online radiative module for the computation of aerosol optical properties in 3-D atmospheric models: validation during the EUCAARI campaign, Geosci. Model Dev., 3, 553–564, https://doi.org/10.5194/gmd-3-553-2010, 2010. 
Bond, T. C. and Bergstrom, R. W.: Light absorption by carbonaceous particles: an investigative review, Aerosol Sci. Technol., 40, 27–67, 2006. 
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The understanding of the exactly retrieved optically effective aerosol complex refractive index (ACRI) of aged BC affected by their microphysics is numerically evaluated. A simple new ACRI parameterization for heavily coated BC in coarse mode is then proposed. We suggest that, to produce reliable estimates of BC radiative forcing in aerosol–climate models, the optically effective ACRI, rather than the ACRI given by the VWA, appears to be essential, especially for coarse coated BC particles.
The understanding of the exactly retrieved optically effective aerosol complex refractive index...
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