Fig. 2: The Sahel monsoon rainfall and SMOPI relationship.
From: The global Sahel monsoon ocean-pressure index reconciles its regional and large-scale features
Heatmap of Pearson correlation (a–d) and Distance correlation (e–h) between Sahel monsoon rainfall first principal component (PC1 Rainfall) and SMOPI for subseasonal variability. Correlations between high- and low-pressure systems over the continental region and oceanic basins (SLP boxes), and both Sahel monsoon rainfall and SMOPI, are also shown, for (a, e) JRA55, (b, f) ERA5, (c, g) MPI-ESM1-2-LR and (d, h) CMIP6. Additionally, intercorrelations among the five SLP boxes highlight the neutralizing or amplifying effects among the physical processes associated with pressure systems, leading to amplified or attenuated rainfall. In each box, the top number indicates the correlation value, and the bottom number is the p-value.
