Enhanced UV penetration due to ozone cross-section changes induced by doubling

Creators: Yung, Yuk L.; Jiang, Yibo; Liao, Hong; Gerstell, M. F.

Abstract

Models predict that CO_2 doubling in the atmosphere cools the stratosphere by as much as 10°C. We argue that this effect alone, through the temperature dependence of the ozone spectrum, can result in an increase of a few percent in UV-B (280–320 nm) penetration at the Earth's surface. The increase in Erythema-weighted UV radiation is about 1%. Future spectral observations of UV at the surface could distinguish this effect from any result of changes in ozone abundance.

Additional Information

© 1997 American Geophysical Union. Received July 17, 1997; revised November 4, 1997; accepted November 7, 1997. We thank A. P. Ingersoll, M. Allen, J. Kaye, D. V. Michelangeli, S. Sander for valuable comments. We are grateful to M. Ko and two anonymous referees for suggestions on focusing and shortening the paper. This research is supported by NASA grant NAG1-1806 to the California Institute of Technology. Contribution number 5674 from the Division of Geological and Planetary Sciences, California Institute of Technology.

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