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

Figure 7

Wavelet coherence between climate signal (ENSO, AO, and IOD) and precipitation (in the upper, middle, and lower reaches) of the Heihe River basin. The thick contour indicates the 95% confidence level against red noise. The relative phase relationship is shown as arrows (with in-phase pointing right, antiphase pointing left, ENSO leading precipitation by 90° pointing straight down, and precipitation leading ENSO pointing straight up).