Table 1.

Chlorophyll integrated over the upper 100 m, fluxes of nitrate, silicic acid and DIC into the upper ocean, K_z used to calculate fluxes, deficits of nitrate, silicic acid and DIC, and the uptake ratios of [Si(OH)₄⁻]/[NO₃⁻] and [NO₃⁻]/[PO₄³⁻] from linear regressions of macronutrient concentrations (figure 7a,b). Uptake ratios are only given for statistically significant relationships (p < 0.05); NS denotes no significant relationship. Uncertainties are standard errors. Macronutrient deficits are computed relative to wintertime values, assuming that the high concentrations at 40 m (25 m for T09 and T10) measured during the cruise are found all the way to the surface in winter. Macronutrient fluxes were calculated by multiplying the nutrient–depth gradient between the uppermost sample of mCDW and the surface sample by estimated K_z.

	chlorophyll (100 m) (mg m−2)	Kz (10−5 m2 s−1)	nitrate flux (mmol m−2 d−1)	nitrate deficit (mmol m−2)	Si flux (mmol m−2 d−1)	Si deficit (mmol m−2)	DIC flux (mmol m−2 d−1)	DIC deficit (mmol m−2)	[Si(OH)4−]/[NO3−]	[NO3−]/[PO43−]
T01	183.90	0.71	0.13	204.55	0.12	273.27	0.67	2144	NS	15.3 ± 0.3
T02	30.85	0.39	0.03	106.76	0.09	67.62	0.24	1036	NS	14.1 ± 0.4
T03	178.24	0.64	0.16	376.45	0.08	197.92	0.80	2857	0.6 ± 0.1	15.7 ± 0.3
T04	49.62	2.24	0.24	129.91	0.45	28.13	2.15	935	NS	14.8 ± 0.4
T05	231.37	0.75	0.21	322.16	0.26	278.63	0.99	2557	0.8 +0.04	15.3 ± 0.1
T06	153.06	3.83	0.56	377.71	0.49	271.99	2.44	2641	0.8 ± 0.1	15.7 ± 0.4
T07	159.35	1.90	0.41	172.85	0.67	318.09	2.63	1469	1.1 ± 0.2	15.3 ± 0.4
T08	97.37	0.18	0.04	157.94	0.07	257.05	0.20	1051	1.2 ± 0.1	14.7 ± 0.3
T09	182.04	0.26	0.06	121.11	0.13	190.77	0.25	825	1.4 ± 0.2	13.4 ± 0.2
T10	95.15	0.36	0.04	51.22	0.12	85.08	0.21	321	1.5 ± 0.1	12.4 ± 0.4
CH1	191.02	0.33	0.05	222.20	0.09	262.56	0.28	1570	1.0 ± 0.1	13.0 ± 0.4