The EFFECT of INDUSTRIAL EMISSIONS

on Our ENVIRONMENT and CLIMATE CHANGE

工业排放与气候变化

Roger J. CHENG, ASRC UALBANY SUNY

Effect of Graphitic Carbon on the Albedo of Clouds

Petr Ch�lek and V. Ramaswamy
• National Center for Atmospheric Research,
• Boulder, CO 80307
• Roger J. CHENG
• Atmospheric Sciences Research Center,
• State University of New York, Albany, NY 12222

(Manuscript received October 17, 1983, in final form August 22, 1984) �

ABSTRACT

We examine the radioactive properties of clouds containing submicron soot Particles as impurities. The soot particles are assumed to be distributed Randomly inside water drops. The refractive index of this inhomogeneous mixture is evaluated using the mixing rule for a composite medium. Single and multiple scattering properties are obtained using, respectively the Mie theory and the delta-Eddington approximation.

The presence of soot enhances the visible light absorption in clouds. A soot volume fraction of 7 � 10"6 in a model stratus cloud increases the value of the single scattering co-albedo from 10"7 (the value corresponding to that of pure water) to 10"3.

• Journal of the Atmospheric Sciences
• Volume 41, Issue 21 (November 1984)

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