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Andreas Schlueter, Andreas H. Fink, Peter Knippertz, and Peter Vogel

1. Introduction Rainfall variability substantially affects societies in northern tropical Africa ( Sultan et al. 2005 ). More than 96% of cultivated land in sub-Saharan Africa is rain-fed ( FAO 2016 ). Despite this, major operational global weather prediction models still fail to deliver skillful short-range precipitation forecasts over this region ( Vogel et al. 2018 ). This corroborates the need for an improved understanding of the underlying processes involved in the generation of

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Georgios Fragkoulidis and Volkmar Wirth

circumglobal waves (e.g., Lee and Held 1993 ; Chang 1993 ). Although theoretical arguments for the evolution of Rossby waves in idealized setups had already been put forward in the middle of the twentieth century ( Dickinson 1978 , and references therein), their actual behavior and role in the atmosphere started being investigated in recent decades, facilitated by the increasing data availability and advances in computer performance [see Wirth et al. (2018) for a review of recent developments]. In this

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