Association of convection with the 5-Day Rossby-Haurwitz wave
MJ King, MC Wheeler, TP Lane
Journal of the Atmospheric Sciences | Americal Meteorological Society | Published : 2015
The seasonality, regionality, and nature of the association between tropical convection and the 5-day wavenumber-1 Rossby-Haurwitz wave are examined. Spectral coherences between daily outgoing longwave radiation (OLR), a proxy for convection, and 850-hPa zonal wind over the period January 1979- February 2013 are compared for different seasons and for phases of El Niño-Southern Oscillation (ENSO) and the quasi-biennial oscillation (QBO). Increased coherence, indicating a stronger association, occurs in boreal spring and autumn, with slightly reduced coherence in boreal summer and significantly reduced coherence in boreal winter. The regionality of the association is examined using lagged-regr..View full abstract
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Awarded by Australian Research Council's Centres of Excellence Scheme
This work has been supported by the Australian Research Council's Centres of Excellence Scheme (CE110001028), and an Australian Postgraduate Award supports the first author. We acknowledge some help and advice from Nedjeljka Zagar, Roland Madden, and George Kiladis; and we thank Greg Roff, Hongyan Zhu, and the anonymous reviewers for their helpful comments that improved the manuscript.