Statistical Connection between the Madden–Julian Oscillation and Large Daily Precipitation Events in West Africa

摘要: AbstractThis study focuses on the impact of Madden–Julian oscillation (MJO)—as monitored by a well-known multivariate index—on large daily precipitation events in West Africa for period 1981–2014. Two seasons are considered: near-equatorial wet season March–May (MAM) and peak African monsoon during July–September (JAS), when intertropical convergence zone (ITCZ) is at its most northerly position. Although MJO-related interannual variation seasonal mean rainfall large, focus here impacts MJO time scales because variations frequency intense, short-term, flood-causing, more important agriculture than precipitation, particularly near Guinean coast, where abundant. Using composites based thresholds amounts, changes heaviest associated with phase in...