An Advanced Review of the Relationships between Sahel Precipitation and Climate Indices: A Wavelet Approach
Figure 2
Continuous wavelet transform for (a) western Sahel rainfall, (b) North Atlantic Oscillation (NAO), (c) Atlantic Multidecadal Oscillation (AMO), and (d) Indian Ocean Dipole (IOD). The thick contour enclosed regions are greater than 95% confidence for a red-noise process. The thin solid line indicates the “cone of influence,” where edge effects become important.
