July–September rainfall in the Greater Horn of Africa: the combined influence of the Mascarene and South Atlantic highs

Abstract July-September rainfall is a key component of Ethiopia’s annual and source variability throughout inland Greater Horn Africa. In this study we investigate the relative influences Mascarene (MH) South Atlantic (AH) highs on in covarying region Africa using CHIRPS observed ERA5 reanalysis. We show that mixed metric circulation at 850 hPa these two subtropical anticyclones (AH-MH), better correlated with than individual high circulations. Variations remote are translated by changes Central African westerlies Turkana Jet wind speeds. apply AH-MH to CMIP5 CMIP6 ensembles it good indicator mean across both ensembles. Biases shown be related Hadley atmosphere-only simulations, while causes biases more varied. Coupled model southern ocean warm western Indian Ocean CMIP6. shows an improved relationship between winds ensemble.