Characteristics of Lake Chad Level Variability and Links to ENSO, Precipitation, and River Discharge

Figure 7

Precipitation and ENSO cross-wavelet spectra: (a) northern LCB; (b) southern LCB and wavelet coherence; (c) northern LCB; and (d) southern LCB. 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.

(a)

(b)

(c)

(d)