The Cloud albedo reference article from the English Wikipedia on 24-Apr-2004
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Cloud albedo

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Cloud albedo is a measure of the reflectivity of a cloud - higher values mean that the cloud can reflect more solar radiation.

Cloud albedo varies from less than 10% to more than 90% and depends on drop sizes, liquid water or ice content, thickness of the cloud, and the sun's zenith angle. The smaller the drops and the greater the liquid water content, the greater the cloud albedo, if all other factors are the same.