Table 2: Correlations between the polar motion interannual variations estimated from geodetic residuals, GRACE solutions, and CPC and GLDAS hydrological models. Correlation values are better for than . This discrepancy is possibly caused by errors of the oceanic model removed from the geodetic observations.^{a}

Percentage of explained variance

Correlation

Magnitude

Phase degree

G-A-O/GRACE

−7

40

0.3

0.7

0.6

−34

G-A-O/CPC

9

37

0.3

0.6

0.6

−25

G-A-O/GLDAS

11

45

0.3

0.7

0.6

−22

GRACE/CPC

−22

34

0.2

0.6

0.6

27

GRACE/GLDAS

37

4

0.6

0.4

0.5

23

^{
a}According to the Student-t test, the significance level of correlation is 0.17. The standard error of the difference between two values of correlation is 0.19. G-A-O: geodetic residuals (geodetic-atmospheric-oceanic excitations), GRACE: GRACE solutions of GRGS, CPC, and GLDAS: hydrological excitations.