Fig. 8
From: Reducing filter effects in GRACE-derived polar motion excitations
Polar motion excitation functions for the continental hydrosphere \(\chi ^\text{H}\), oceans \(\chi ^\text{O}\), Antarctica \(\chi ^\text{A}\) and Greenland \(\chi ^\text{G}\) derived from GRACE GFZ RL06 gravity field solutions by applying (1) only the DDK filter (green), (2) the DDK filter and the gain factors k (black) and (3) the DDK filter, the gain factors k and the scaling factors \(f^i\) (red)