Table 1. Meltwater and suspended sediment Fe concentrations from Leverett Glacier and comparative studies.

Fe source	Mean Fe concentrations	s.d.	Fe range	n	Source
Filtered iron source (nM)
Greenland
<0.02 μm	7	9	<d1–37	66	DFe—this study
0.02–0.45 μm	699	650	232–4,701	63	CNFe—this study
<0.03 μm—GrIS	22		6–59	15	11
0.03–0.4 μm—GrIS	30.8		2–117	15	11
<0.2 μm—GrIS	3,700		2,200–9,310	13	12
Antarctica
<0.2 μm—Blood Falls, AntIS	4 × 106			1	41
<0.45 μm—Dry Valleys, AntIS	335		82–1,146	11	58
Ascorbate-extractable sediments (% dw)
Glacial meltwater—GrIS	0.15	0.02	0.11–0.18	33	SSFe—this study
Icebergs—AntIS	0.15	0.12	0.06–0.36	10	10
Icebergs—AntIS	0.19	0.18	0.04–0.49	4	13
Aoelian dust—East Med.	0.03			1	37
Aoelian dust—West Med.	0.08			1	37
Aoelian dust—Sahara	0.02			2	37
Aoelian dust—Sahel	0.02			2	37
Aoelian dust—Beijing	0.06			1	37

AntIS, Antarctic ice sheet; CNFe, colloidal/nanoparticulate Fe; DFe, dissolved Fe; GrIS, Greenland ice sheet.

Filtered concentrations are discharge weighted and presented in nanomolar. Values below the detection limit are indicated by <d1. Ascorbate-extractable concentrations are presented as % dry weight (% dw).