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100
100
90
10
80
70
1
60
MQ
50
0.1
Acet
Form
40
Seaw
0.01
30
0.1
10
1000
100000
Total Fe (ng m
-3
)
20
10
0
0
5000
10000
15000
20000
Total Fe (ng m
-3
)
Fig. 4.3
1,000 aerosol samples plotted as a function of total
atmospheric Fe concentration. Data is taken from the compilation of Sholkovitz et al. (
2012
)and
symbols
indicate the leaching solutions in which the aerosol samples were solubilised. Inset shows
the same data replotted on a log-log scale
Percentage of soluble Fe in
significant. This effect seems to be common to most of the analytical methods used
to determine soluble Fe concentrations, except for leaching in formate solutions.
The presentation of the data in Fig.
4.4
does not allow for variations due to
other factors, such as dust source. In Table
4.1
, we break the Sholkovitz data set
down further to show variations in median solubility between soluble Fe extraction
methods in different oceans over a broader range of total Fe concentrations. This
table shows similar trends in solubility between methods to those evident in Fig.
4.4
and may point to differences in solubility between different ocean basins (e.g. MQ
solubility in the North Pacific may be slightly higher than in the North Atlantic).
However, some of the apparent solubility differences in Table
4.1
(e.g. MQ solubility
is higher than acetate solubility) are probably artefacts. Indeed, a recent direct
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