Table 1. MLR coefficients of Eq (5) of seawater pH_insitu from various time series studies. The pH° and T° are determined using the SLR method when t° = 1988 (see Supplementary Table S2).

		Eq (5) pH = pH° + m1(t−t°) + m2(T−T°)
Station	Year	pHO	T°	m1 x10−3 pH unit yr−1	m2 x10−3 pH unit oC−1	Standard Error	R2	n
BATS	1991–2010	8.1297	22.85	−1.8 ± 0.2	−9.9 ± 0.3	0.0135	0.86	215
CARIACO	1995–2010	8.0835	24.82	−1.5 ± 0.3	−7.0 ± 0.7	0.0155	0.51	144
ESTOC	1995–2009	8.1155	20.46	−1.6 ± 0.1	−9.6 ± 0.2	0.0053	0.94	144
HOT	1988–2010	8.1172	24.68	−1.7 ± 0.1	−9.3 ± 0.5	0.0088	0.77	222
SEATS	1998–2006	8.0531	30.63	−1.5 ± 0.9	−7.7 ± 1.0	0.0123	0.66	35
Average		8.0998 ± 0.0311	24.69 ± 3.76	−1.6 ± 0.1	−8.7 ± 1.4	0.011 ± 0.004	0.75 ± 0.17	5