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Optics Letters

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  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 9 — May. 1, 2014
  • pp: 2607–2610

Optics of water cloud droplets mixed with black-carbon aerosols

Michael I. Mishchenko, Li Liu, Brian Cairns, and Daniel W. Mackowski  »View Author Affiliations


Optics Letters, Vol. 39, Issue 9, pp. 2607-2610 (2014)
http://dx.doi.org/10.1364/OL.39.002607


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Abstract

We use the recently extended superposition T-matrix method to calculate scattering and absorption properties of micrometer-sized water droplets contaminated by black carbon. Our numerically exact results reveal that, depending on the mode of soot–water mixing, the soot specific absorption can vary by a factor exceeding 6.5. The specific absorption is maximized when the soot material is quasi-uniformly distributed throughout the droplet interior in the form of numerous small monomers. The range of mixing scenarios captured by our computations implies a wide range of remote sensing and radiation budget implications of the presence of black carbon in liquid-water clouds. We show that the popular Maxwell-Garnett effective-medium approximation can be used to calculate the optical cross sections, single-scattering albedo, and asymmetry parameter for the quasi-uniform mixing scenario, but is likely to fail in application to other mixing scenarios and in computations of the elements of the scattering matrix.

© 2014 Optical Society of America

OCIS Codes
(290.0290) Scattering : Scattering
(290.4020) Scattering : Mie theory
(290.4210) Scattering : Multiple scattering
(290.5850) Scattering : Scattering, particles

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: March 6, 2014
Revised Manuscript: March 20, 2014
Manuscript Accepted: March 25, 2014
Published: April 21, 2014

Citation
Michael I. Mishchenko, Li Liu, Brian Cairns, and Daniel W. Mackowski, "Optics of water cloud droplets mixed with black-carbon aerosols," Opt. Lett. 39, 2607-2610 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-9-2607


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References

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