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

Earth, Planets and Space

Table 2 Percentage of change in STDerr, Corr, Var_exp, and RMSD when MAS data are used instead of SH solutions

	STDerr change (%)		Corr change (%)		Var_exp change (%)		RMSD change (%)
	χ₁	χ₂	χ₁	χ₂	χ₁	χ₂	χ₁	χ₂
Overall (land)	− 30	− 29	− 3	5	− 13	18	4	− 9
Overall (global)	300	− 94	38	40	414	92	− 17	− 30
Seasonal (land)	166	− 65	4	− 1	− 9	43	8	− 57
Seasonal (global)	− 16	− 54	5	− 4	− 3	33	2	− 30
Non-seasonal (land)	− 2	− 8	− 7	0	− 14	0	3	− 1
Non-seasonal (global)	− 32	− 84	39	60	267	146	− 19	− 30

Both land data (land MAS-based HAM/CAM compared to TWS-based HAM/CAM) and global data (global MAS-based HAM/CAM compared to GSM-based HAM/CAM) are considered in this table. We examine overall detrended time series, seasonal variations, and non-seasonal variations. The values showing an improvement in results after using MAS data are italicized. Note that for STDerr change and RMSD change the improvement is when variation is negative (STDerr and RMSD decreased after using MAS data), whereas for Corr change and Var_exp change, the improvement occurs when the parameter value is positive (Corr and Var_exp increased after using MAS data)