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Table 1 Long-term trends of polar motion

From: Analysis and prediction of polar motion using MSSA method

Literature PMX (mas/year) PMY (mas/year) PM (mas/year) Direction (°W) Data/time span Trend
This paper 2.02 ± 0.2 3.07 ± 0.2 3.67 56.70 14 C04/1962–2020.5 Linear trend
This paper 2.04 ± 0.02 3.11 ± 0.02 3.72 56.79 14 C04/1962–2020.5 Non-linear trend
Schuh et al. (2001) 4.00 77.36 93 C01/1861–1997 Linear trend
Schuh et al. (2001) 3.31 76.10 OA97/1899.7–1992.0 Linear trend
Chen et al. (2013) 7.26 ± 0.17 (\(\chi_{1}\)) 5.45 ± 0.25 (\(\chi_{2}\)) 36.90 08 C04/2005–2011 Linear trend/mass excitations