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|Title:||Oxygen, Ozone, Aerosols & Ultraviolet Extinction in Geological Times|
Saha, A K
|Abstract:||An attempt is made at some quantitative estimation of solar ultraviolet extinction during geological times as combined absorbing (and scattering) effect of ozone and aerosols. Based on some atmospheric oxygen growth models, ozone levels are estimated, whereas aerosol levels are inferred from volcanic ash deposit records. It would appear that ultraviolet dosages at ground level should have generally remained below harmful limits throughout the geological period of the last 600 million years. Influence of biology and ecosystems may, however, have been possible with sudden decrease of ozone, caused by events like a suprenova explosion, not too far away from the sun.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.16(5) [October 1987]|
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