Journal article
Mechanisms linking global 5-Day waves to tropical convection
MJ King, MC Wheeler, TP Lane
Journal of the Atmospheric Sciences | AMER METEOROLOGICAL SOC | Published : 2017
Abstract
Reanalysis data and satellite-derived rainfall measurements are examined to determine possible mechanisms linking the "5 day" Rossby-Haurwitz wave to localized variations of tropical convection. The mechanisms in all regions rely on the modulation of zonal winds near the equator by the wave, but the nature of these mechanisms depends strongly on local topography and local climate. In the upper Amazon basin, the wave modulates the strength of prevailing easterlies and thus the upslope flow and associated convection on the eastern edge of the Andes. Similar modulation of upslope flow is involved off the Panamanian and Colombian Pacific coasts, but the deflection and confluence of low-level win..
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Funding Acknowledgements
ERA-Interim data used in this study was provided by ECMWF and obtained from the ECMWF data server, and TRMM data were obtained from the NASA Goddard Earth Sciences (GES) Data and Information Services Center (DISC). This study was supported by the Australian Research Council's Centres of Excellence scheme (Grant CE110001028) and by an Australian Postgraduate Award for the first author, with writing assisted by funding from a writing-up award from the Albert Shimmins Fund.