The Implication of Climate Signal for Precipitation in the Heihe River Basin, Northwest China

Figure 6

Global wavelet power spectrum for the monthly precipitation anomalies in the upper, middle, and lower reaches of the Heihe River basin. The lower solid line is the mean read-noise spectrum, while the upper dashed line is the 95% confidence level for the global wavelet spectrum by assuming a red-noise process with the mean lag-1 autocorrelation of 0.093.