Table 1 Fe speciation, dissolved organic matter (DOC) and primary production (PP) in the LCW

From: Glacially derived iron is more bioavailable to Antarctic phytoplankton than other sources

 

dFe (nM)

LT (nM)

L* (nM)

\(\log {{{\rm{K}}}}_{{{\rm{FeL}}},{{\rm{F}}}{{{\rm{e}}}}^{{\prime} }}^{{{\rm{cond}}}}\)

α

Fe’ (pM)

DOC (µmol L−1)

PP (µg C L−1 d−1)

LCW

0.42

0.42 ± n.d.

0.00

n.d

n.d.

n.d.

66.86

71.12

+ GW (KHB)

0.43

0.86 ± 0.55

0.43

n.d.

n.d.

22.10 ± 16.10

71.05

87.36

+ MW (KHB)

0.55

0.80 ± 0.16

0.73

11.58 ± 0.32

304.15

4.54 ± 4.95

64.88

145.62

+ MW (CB)

0.55

0.92 ± 0.18

0.37

10.93 ± 0.30

78.30

10.80 ± 7.83

63.66

126.08

+ EW (CB)

0.45

1.23 ± 0.13

0.78

11.45 ± 0.16

346.66

1.90 ± 0.98

64. 28

124.70

+ FeCl3

1.26

1.37 ± 0.27

0.11

11.37 ± 0.51

321.16

17.10 ± 19.70

64.09

346.39

  1. Dissolved iron concentration (dFe, measured via ICP-MS), total ligand concentration (LT), conditional stability constants (\(\log {{{\rm{K}}}}_{{{\rm{FeL}}},{{\rm{F}}}{{{\rm{e}}}}^{{\prime} }}^{{{\rm{cond}}}}\)), complexation capacity (α = LT x 10^ \(\log {{{\rm{K}}}}_{{{\rm{FeL}}},{{\rm{F}}}{{{\rm{e}}}}^{{\prime} }}^{{{\rm{cond}}}}\), where LT is in mol L−1), concentration of free inorganic Fe (Fe’). For LT, \(\log {{{\rm{K}}}}_{{{\rm{FeL}}},{{\rm{F}}}{{{\rm{e}}}}^{{\prime} }}^{{{\rm{cond}}}}\), α and Fe’, values are represented ± the uncertainty of the fitting method. The natural Fe sources (subaerial groundwater seepage (GW), proglacial meltwater (MW), estuarine water (EW)) were sampled in King Haakon Bay (KHB) and Cumberland Bay (CB).
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