Difference between revisions of "Volume extinction coefficient"

From Glossary of Meteorology
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<div class="definition"><div class="short_definition">A measure of the depletion of [[monochromatic]] radiance passing  through some medium in a constant direction.</div><br/> <div class="paragraph">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<sup>&minus;1</sup>. 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 &#x003bc;m is less than 0.02 km<sup>&minus;1</sup>, whereas in a wet [[cloud]] it may exceed 100 km<sup>&minus;1</sup>  at the same wavelength.</div><br/> </div>
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<div class="definition"><div class="short_definition">A measure of the depletion of [[monochromatic]] radiance passing  through some medium in a constant direction.</div><br/> <div class="paragraph">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<sup>-1</sup>. 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 &#x003bc;m is less than 0.02 km<sup>-1</sup>, whereas in a wet [[cloud]] it may exceed 100 km<sup>-1</sup>  at the same wavelength.</div><br/> </div>
 
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Latest revision as of 16:26, 20 February 2012



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.