Fig. 4

Composites of the mean zonal wind (a), temperature (d), amplitudes of SPW1 (g) and SPW2 (j) in the geopotential height simulated with the MUAM under La Niña conditions (color contours). The corresponding differences (b, e, h, k) between ensembles with El Niño and La Niña (color contours). The right panels show the same differences but calculated using the MERRA data (c, f, l, l). The shaded areas in the left panels indicate the standard deviations obtained during the ensemble averaging. The shaded regions in the middle and right panels denote the statistical significance