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Science 19 October 2001:
Vol. 294. no. 5542, p. 473
DOI: 10.1126/science.294.5542.473c
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This Week in Science
Vigorous circulation in the troposphere makes predicting the weather more than 1 week in advance difficult. The stratosphere, which lies immediately above the troposphere, is far more stable but is not often considered to have much effect on surface weather patterns. Baldwin and Dunkerton (p. 581, see the news story by Kerr) present evidence that strong variations in stratospheric circulation at altitudes above about 50 kilometers can descend into the troposphere and affect the weather there. These events may be followed by months during which patterns of surface pressure are systematically altered, as reflected in large-scale atmospheric pressure patterns called the Arctic Oscillation and the North Atlantic Oscillation. This effect may allow storminess and storm tracks to be predicted more accurately.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
