South East tropical Atlantic warm events and southern African rainfall

摘要: [1] Intrusions of warm equatorial water in the South East Atlantic Ocean off Angola and Namibia may be linked with above average rainfall along coast those countries but sometimes also inland areas southern Africa e.g. Zambia. During 1984, 1986, 1995 2001 events, occurred near sea surface temperature (SST) anomalies extended from to an extent that appeared depend on intensity regional moisture convergence atmospheric circulation anomalies. Rainfall over western Angola/Namibia is greatest for events which local act strengthen climatological westwards flux Indian sourced across low latitude flow anticyclonically warmest SST thereby weakening mean southeasterly away SE Atlantic. The significance occurring during February April period this time when reaches its maximum annual cycle (up 28C northern Angola) favours more intense evaporation convection a greater impact late austral summer rainfall. Better understanding these necessary assessing impacts rainfall, agriculture fisheries improving seasonal forecasting region. INDEX TERMS: 3309 Meteorology Atmospheric Dynamics: Climatology (1620); 3374 Tropical meteorology; 3319 General circulation; 1821 Hydrology: Floods; 3339 Ocean/atmosphere interactions (0312, 4504). Citation: Rouault, M., P. Florenchie, N. Fauchereau, C. J. Reason, tropical African Geophys. Res. Lett., 30(5), 8009, doi:10.1029/2002GL014840, 2003.