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UV radiation from the young sun and oxygen and ozone levels in the prebiological palaeoatmosphereUV measurements of young T-Tauri stars, resembling the sun at an age of a few million years, have recently been made with the International Ultraviolet Explorer. They indicate that young stars emit up to 10,000 times more UV than the present sun. The implications for the origin and evolution of O2 and O3 in the prebiological palaeoatmosphere are presented here. The results of photochemical calculations indicate that the O2 surface mixing ratio was a factor 10,000-1,000,000 times greater than the standard value of 10 to the -15. This new value reconciles the simultaneous existence of oxidized iron and reduced uranium.
Document ID
19820048672
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Canuto, V. M.
(NASA Goddard Institute for Space Studies New York, NY, United States)
Levine, J. S.
(NASA Goddard Inst. for Space Studies New York, NY, United States)
Augustsson, T. R.
(NASA Langley Research Center Hampton, VA, United States)
Imhoff, C. L.
(Computer Sciences Corp. Greenbelt, MD, United States)
Date Acquired
August 10, 2013
Publication Date
April 29, 1982
Publication Information
Publication: Nature
Volume: 296
Subject Category
Geophysics
Accession Number
82A32207
Distribution Limits
Public
Copyright
Other

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