Weakened stratospheric quasibiennial oscillation driven by increased tropical mean upwelling

Yoshio Kawatani () and Kevin Hamilton
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Yoshio Kawatani: Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showamachi, Kanazawa-ku, Yokohama, Kanagawa 236-0001, Japan
Kevin Hamilton: International Pacific Research Center, SOEST, University of Hawaii at Manoa, 1680 East West Road, Honolulu, Hawaii 96822, USA

Nature, 2013, vol. 497, issue 7450, 478-481

Abstract: In the quasibiennial oscillation, the prevailing wind direction in the tropical stratosphere switches between easterly and westerly and back with a period of about two years; now an analysis of a suite of radiosonde wind data reveals that the amplitude of this oscillation has weakened over the past six decades, most probably as a result of increased tropical upwelling in the lower stratosphere.

Date: 2013
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DOI: 10.1038/nature12140

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