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Extratropical signature of the quasi-biennial oscillation

Ruzmaikin, Alexander and Feynman, Joan (2005) Extratropical signature of the quasi-biennial oscillation. Journal of Geophysical Research D, 110 (D11). Art. No. D11111. ISSN 0148-0227. doi:10.1029/2004JD005382.

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Using the assimilated data from the National Centers for Environmental Prediction (NCEP) reanalysis, we show that the extratropical signature of the tropical quasi-biennial oscillation (QBO) is seen mostly in the North Annular Mode (NAM) of atmospheric variability. To understand the extratropical manifestation of the QBO, we discuss two effects that have been suggested earlier: (1) The extratropical circulation is driven by the QBO modulation of the planetary wave flux, and (2) the extratropical circulation is driven by the QBO-induced meridional circulation. We found that the first effect is seen in wave 1 in the beginning of winter and in wave 2 in the end of winter. The QBO-induced circulation affects midlatitude regions over the entire winter. To investigate the QBO-NAM coupling, we use an equation that relates the stream function of the meridional circulation and the polar cap averaged temperature, which is a proxy for the NAM index. In addition to the annual Ω_a and the QBO frequency Ω_Q the spectrum of its solutions indicates the satellite frequencies at Ω_a ± Ω_Q.

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Additional Information:© 2005 The American Geophysical Union. Received 24 August 2004; Revised 29 December 2004; Accepted 24 February 2005; Published 14 June 2005. This research was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration and was funded through the internal Research and Technology Development program. We are grateful to David Camp and Run-Lie Shia for their generous help in this study. We thank three anonymous reviewers for their critical and helpful comments.
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Issue or Number:D11
Record Number:CaltechAUTHORS:20140825-123634129
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Official Citation:Ruzmaikin, A., Feynman, J., Jiang, X., & Yung, Y. L. (2005). Extratropical signature of the quasi-biennial oscillation. Journal of Geophysical Research: Atmospheres, 110(D11), D11111. doi: 10.1029/2004jd005382
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48851
Deposited On:25 Aug 2014 21:07
Last Modified:10 Nov 2021 18:36

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