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Science 9 July 1999:
Vol. 285. no. 5425, pp. 208 - 210
DOI: 10.1126/science.285.5425.208
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Perspectives

Also see the archival list of Science's Compass: Enhanced Perspectives

ATMOSPHERIC SCIENCE:
Enhanced: Summer in the Stratosphere

D. W. Fahey and A. R. Ravishankara

The well known Antarctic ozone hole occurs in the winter and spring stratosphere, as a result of ozone destruction by human-induced halogen compounds in the atmosphere. Fahey and Ravishankara (page 208) contrast the ozone destruction mechanisms active during the winter with those active during the summer. In contrast to the winter ozone hole, summertime ozone destruction can be attributed to chemical compounds that are naturally present in the stratosphere. This destruction will persist even when human-induced emissions are reduced.

The authors are at the National Oceanic and Atmospheric Administration Aeronomy Laboratory, Boulder, CO 80303, USA. E-mail: ravi{at}al.noaa.gov

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Science. ISSN 0036-8075 (print), 1095-9203 (online)