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RMS prediction error in polar motion for forecast horizons of 5, 10, 40, and 90 days in x-pole, y-pole coordinate and 2D polar motion vector for different EAM forecast input. Black line: prediction approach using erroneous EAM forecasts; purple line: using perfect EAM forecast without any deviation from EAM analysis; yellow line: using EAM forecasts with corrected AAM X1 and X2 motion terms. The percentages give the improvement in RMS compared to the original RMS (black).