Catalytic Processes in the Atmospheres of Earth and Venus

Creators: DeMore, W. B.; Yung, Yuk L.

Abstract

Photochemical processes in planetary atmospheres are strongly influenced by catalytic effects of minor constituents. Catalytic cycles in the atmospheres of Earth and Venus are closely related. For example, chlorine oxides (CIO_x) act as catalysts in the two atmospheres. On Earth, they serve to convert odd oxygen (atomic oxygen and ozone) to molecular oxygen. On Venus they have a similar effect, but in addition they accelerate the reactions of atomic and molecular oxygen with carbon monoxide. The latter process occurs by a unique combination of CIO_x catalysis and sulfur dioxide photosensitization. The mechanism provides an explanation for the very low extent of carbon dioxide decomposition by sunlight in the Venus atmosphere.

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© 1982 American Association for the Advancement of Science The research described in this article was performed at Jet Propulsion Laboratory, California Institute of Technology, under NASA contracts NAS7-100 and NSG-7376. We are grateful for helpful comments and suggestions by several colleagues, especially M. A. Allen and W. T. Huntress.

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Catalytic Processes in the Atmospheres of Earth and Venus

Abstract

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