Umkehr effect: Difference between revisions
From Glossary of Meteorology
imported>Perlwikibot (Created page with " {{TermHeader}} {{TermSearch}} <div class="termentry"> <div class="term"> == Umkehr effect == </div> <div class="definition"><div class="short_definition">An [[anomaly]...") |
imported>Perlwikibot No edit summary |
||
| Line 9: | Line 9: | ||
</div> | </div> | ||
<div class="definition"><div class="short_definition">An [[anomaly]] of the relative [[zenith]] radiances of [[scattered]] sunlight at certain wavelengths in the [[ultraviolet]] as the sun approaches the [[horizon]], due to the presence of the [[ozone layer]].</div><br/> <div class="paragraph">The ratio of radiances measured in the zenith direction at two [[wavelengths]], one strongly absorbed by [[ozone]], the other not so strongly absorbed, shows a steady decrease with [[solar zenith angle]] until a zenith angle of about 86& | <div class="definition"><div class="short_definition">An [[anomaly]] of the relative [[zenith]] radiances of [[scattered]] sunlight at certain wavelengths in the [[ultraviolet]] as the sun approaches the [[horizon]], due to the presence of the [[ozone layer]].</div><br/> <div class="paragraph">The ratio of radiances measured in the zenith direction at two [[wavelengths]], one strongly absorbed by [[ozone]], the other not so strongly absorbed, shows a steady decrease with [[solar zenith angle]] until a zenith angle of about 86°, whereupon the ratio increases. The details of this reversal can be used to determine the vertical distribution of ozone concentration.</div><br/> </div> | ||
</div> | </div> | ||
Revision as of 15:22, 20 February 2012
Umkehr effect
An anomaly of the relative zenith radiances of scattered sunlight at certain wavelengths in the ultraviolet as the sun approaches the horizon, due to the presence of the ozone layer.
The ratio of radiances measured in the zenith direction at two wavelengths, one strongly absorbed by ozone, the other not so strongly absorbed, shows a steady decrease with solar zenith angle until a zenith angle of about 86°, whereupon the ratio increases. The details of this reversal can be used to determine the vertical distribution of ozone concentration.
