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Table 4 Standard deviation (STD) of seasonal time series of GAO, GRACE-based HAM/CAM (GSM, TWS, MAS land, and MAS global) and SLR-based HAM/CAM, errors of STD (STDerr), correlation coefficients (Corr) between HAM/CAM and GAO, percentage of variance in GAO explained by HAM/CAM (Varexp), and root mean square error (RMSD) of HAM/CAM

From: Evaluation of hydrological and cryospheric angular momentum estimates based on GRACE, GRACE-FO and SLR data for their contributions to polar motion excitation

 

STD (mas)

STDerr (%)

Corr

Varexp (%)

RMSD (mas)

χ1

χ2

χ1

χ2

χ1

χ2

χ1

χ2

χ1

χ2

GAO

4.08

7.47

GSM

2.68

2.99

− 34

− 60

0.87

0.95

71

60

2.20

4.71

TWS

3.79

3.07

− 7

− 59

0.81

0.99

64

65

2.44

4.42

MAS land

4.85

5.95

19

− 20

0.84

0.98

58

93

2.63

1.90

MAS global

5.26

5.43

29

− 27

0.91

0.91

69

80

2.25

3.32

SLR

1.67

2.63

− 59

− 65

0.73

0.99

43

57

3.09

4.86

  1. Note that for seasonal variations, the critical value of correlation coefficient for 68 independent points and a 95% confidence level is 0.20, while the standard error of the difference between two correlation coefficients is 0.18