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Science 24 March 2006:
Vol. 311. no. 5768, p. 1713
DOI: 10.1126/science.1121522
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Technical Comments

Comment on "Changes in Tropical Cyclone Number, Duration, and Intensity in a Warming Environment"

Johnny C. L. Chan

Analyses of tropical cyclone records from the western North Pacific reveal that the recent increase in occurrence of intense typhoons reported by Webster et al. (Reports, 16 Sep. 2005, p. 1844) is not a trend. Rather, it is likely a part of the large interdecadal variations in the number of intense typhoons related to similar temporal fluctuations in the atmospheric environment.

Laboratory for Atmospheric Research, Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.

To whom correspondence should be addressed. E-mail: Johnny.chan{at}cityu.edu.hk

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