Impact of the combination and replacement of SLR-based low-degree gravity field coefficients in GRACE solutions

Progress in Earth and Planetary Science

Table 2 Comparison of the trend and amplitude of the annual signal for the combined SLR-GRACE models in a given area for the period from April 2002 to October 2021 without removing the GIA effect

Area	Parameter	COST-G unfiltered 60 × 60	CSR unfiltered 60 × 60	C₂₀,C₃₀ from TN14	C₂₀,C₃₀ from SLR	COMB	COMB 2	COMB 4	COMB 6	COMB DOW
Greenland	Trend [Gt yr⁻¹]	− 179.8	− 181.2	− 177.6	− 178.8	− 177.9	− 178.2	− 178.3	− 178.3	− 178.2
Greenland	Amplitude [Gt]	70.2	64.9	65.3	53.1	42.3	50.2	58.7	62.4	57.5
West Antarctica	Trend [Gt yr⁻¹]	− 115.0	− 117.7	− 111.6	− 109.3	− 112.5	− 112.0	− 111.7	− 111.6	− 111.8
West Antarctica	Amplitude [Gt]	8.6	17.8	10.2	20.6	26.3	18.1	5.7	1.4	8.3
East Antarctica	Trend [Gt yr⁻¹]	41.9	35.4	51.2	57.4	50.5	51.9	52.3	52.2	52.1
East Antarctica	Amplitude [Gt]	66.7	94.7	74.0	142.1	138.5	126.1	98.5	84.3	103.5