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

From: Ice sheets as a significant source of highly reactive nanoparticulate iron to the oceans

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
  1. AntIS, Antarctic ice sheet; CNFe, colloidal/nanoparticulate Fe; DFe, dissolved Fe; GrIS, Greenland ice sheet.
  2. 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).