Table 1. Upper boundary conditions used for the simulated soluble and solid species in the various scenarios defined in section 2.8.

For solutes, these are the concentrations in the bottom boundary layer above the DBL, for solids the depositional fluxes. Between the dates given here, values were linearly interpolated.

Time-dependent Input Parameters	1860	1890	1900	1982	1985	2018	SQ (2030)	M (2030)	O (2030)	NoAa (2030)
O2 (μmol cm-3)	0.180	10−5	10−5	10−5	0.1	0.1	0.1	0.15	0.2	10−5 (from 2020)
NO3 (μmol cm-3)	0.030	0.030	10−5	10−5	0.1	0.1	0.1	0.1	0.100	10−5
SO4 (μmol cm-3)	0.035	0.035	10−5	10−5	0.11	0.11	0.11	0.11	0.11	10−5
NH4 (μmol cm-3)	10−4	10−4	0.15	0.5	0.1	0.1	0.1	0.05	10−4	0.3
Mn(II) (μmol cm-3)	10−10	10−10	0.08	0.08	0.01	0.01	0.01	0.005	10−10	0.08
Fe(II) (μmol cm-3)	10−10	10−10	0.08	0.08	0.01	0.01	0.01	0.005	10−10	0.08
S(-II) (μmol cm-3)	10−10	10−10	0.03	0.034	10−10	10−10	10−10	10−10	10−10	0.03
CH4 (μmol cm-3)	10−10	10−10	0.1	0.8	0.05	0.05	0.05	0.05	10−10	100
OM1 (μmol cm-2 yr-1)	192.5	407.75	479.5	623 (from 1950)	623	623	623	350	210	623
OM2 (μmol cm-2 yr-1)	82.5	174.75	205.5	267 (from 1950)	267	267	267	150	90	267
Mo1 (μmol cm-2 yr-1)	7	7	7	10	10	10	10	8	7	7
Mo2(μmol cm-2 yr-1)	1	1	1	1.25	1.25	1.25	1.25	1.25	1	1
Foh1 (μmol cm-2 yr-1)	18	18	18	23	23	23	23	20	18	18
Foh2(μmol cm-2 yr-1)	3.3	3.3	3.3	3.6	3.6	3.6	3.6	3.4	3.3	3.3
Dbo (Bioturbation)	1	1	0	0	0.2	0.7	0.7	1	1	0
Sedimentation rate (cm yr-1)	0.15	0.15	0.18	0.33 (from 1950)	0.33	0.33	0.33	0.22	0.15	0.33
Constant Input Parameters
CO2 (μmol cm-3)	0.01
HCO3 (μmol cm-3)	1
N2 (μmol cm-3)	0.1
HPO4 (μmol cm-3)	0.001
FeS (μmol cm-2 yr-1)	10−10
Pyrite (μmol cm-2 yr-1)	10−10
Vivianite (μmol cm-2 yr-1)	10−5