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Nature 454, 41-42 (3 July 2008) | doi:10.1038/454041a; Published online 2 July 2008
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College Masters, Department of Medical Education
- Texas Tech University
- El Paso, Texas
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- KAUST
- Jeddah Saudi Arabia
Atmospheric chemistry: Her dark materials
Kevin Zahnle1
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Abstract
A glitch in the history of sulphur isotopes could imply that methane emitted by the ancient biosphere created a high-altitude photochemical smog, which governed the climate in a distinctly Gaian way.
Free oxygen became abundant in Earth's atmosphere around 2.3 billion years ago, a change that was preceded or accompanied by at least three major ice ages.
- Kevin Zahnle is at the NASA Ames Research Center, Moffett Field, California 94035, USA.
Email: kevin.j.zahnle@nasa.gov
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Isotopic evidence for Mesoarchaean anoxia and changing atmospheric sulphur chemistryNature Letters to Editor (11 Oct 2007)