174396.fig.007a
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174396.fig.007b
(b)
Figure 7: Intraseasonal variations spectrum computed from the geodetic residuals (G-A-O), GRACE, CPC, and GLDAS-based excitations. Data sets are interpolated with an uniform sampling of 10-days. GRACE observations provide more power than hydrological models, especially in the prograde and retrograde bands around the frequency of 3 cycles per year.