Volume extinction coefficient

From Glossary of Meteorology
Revision as of 19:19, 26 January 2012 by imported>Perlwikibot (Created page with " {{TermHeader}} {{TermSearch}} <div class="termentry"> <div class="term"> == volume extinction coefficient == </div> <div class="definition"><div class="short_definitio...")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

volume extinction coefficient

A measure of the depletion of monochromatic radiance passing through some medium in a constant direction.

The volume extinction coefficient equals the fractional depletion due to absorption and scattering when monochromatic radiance passes unit distance through a medium in a constant direction. Units are inverse length or km−1. Values depend critically on the medium being traversed, as well as the wavelength. For example, in a Rayleigh atmosphere the volume extinction coefficient at a wavelength of 0.5 μm is less than 0.02 km−1, whereas in a wet cloud it may exceed 100 km−1 at the same wavelength.