Table 2. Description of the exponential change (y = b × e^{k × age}) in whole dissolved organic carbon (DOC_Sum) in mg L^-1, colloidal associated iron (Fe_coll) in μg L^-1, absorbance at wavelengths (λ) 420 and 254 nm (A_λ) (unitless but over path length of 1 m), specific absorbance (SUVA_λ) in L mg C^-1 m^-1, DOC estimated to be from internal microbial (DOC_{FI_auto}) and external terrestrial (DOC_{FI_import}) sources in mg L^-1 based on the fluorescence index (FI), the humification index (HIX) and the freshness index (β: α), across the main lake basins (passing from A to F, excluding basin D), including the adjusted R ², the significance level, (*** p < 0.0001, ** p < 0.001, * p < 0.05), number of sites across the lake (n), the amount of a variable at a water residence time of 0 (t₀), and 2.8 (t_2.8) years, the net change within the lake (Δ in lake), and the half-life (t_1/2) (full details of fitting parameters b and k provided in Table S3 in File S1, as well as results of molecular weight size classes).

	b	k	adj. R2	sig.-level	n	t0	t2.8	Δ in lake	t1/2
DOCSum	10.5	0.114	0.82	***	17	10.5	7.7	-2.9	-6.1
Fecoll	312	-1.09	0.80	***	17	312	15	297	-0.6
A420	3.3	0.418	0.86	***	17	3.26	1.01	-2.25	-1.7
A254	0.4	0.255	0.89	***	17	0.41	0.20	-0.21	-2.7
SUVA420	0.3	0.307	0.86	***	17	0.31	0.13	-0.18	-2.3
SUVA254	4.1	0.255	0.89	***	17	4.11	2.01	-2.10	-2.7
DOCFI_auto	2.5	0.067	0.67	***	16	2.49	3.01	0.51	10.4
DOCFI_import	8.0	0.182	0.89	***	17	7.95	4.78	-3.17	-3.8
FI	1.3	0.021	0.82	***	17	1.35	1.43	0.08
HIX	0.9	0.009	0.42	**	17	0.89	0.87	-0.02
β:α	0.5	0.079	0.90	***	17	0.52	0.65	0.13
%Very Large	1.0	0.788	0.61	**	17	1	0	-1
% Large	24.4	0.139	0.75	***	17	24	17	-8
%Medium	74.5	0.062	0.83	***	17	75	89	14
%Small	90.7	0.240	0.06	no fit	17	−	−	−