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).
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