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| Titel |
Solubility of iron and other trace elements in rainwater collected on the Kerguelen Islands (South Indian Ocean) |
| VerfasserIn |
Alexie Heimburger, R. Losno, S. Triquet |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 10 ; Nr. 10, no. 10 (2013-10-22), S.6617-6628 |
| Datensatznummer |
250085371
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| Publikation (Nr.) |
 copernicus.org/bg-10-6617-2013.pdf |
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| Zusammenfassung |
| The soluble fraction of aerosols that is deposited on the open ocean is vital
for phytoplankton growth. It is believed that a large proportion of this
dissolved fraction is bioavailable for marine biota and thus plays an
important role in primary production, especially in HNLC oceanic areas where
this production is limited by micronutrient supply. There is still much
uncertainty surrounding the solubility of atmospheric particles in global
biogeochemical cycles and it is not well understood. In this study, we
present the solubilities of seven elements (Al, Ce, Fe, La, Mn, Nd, Ti) in
rainwater on the Kerguelen Islands, in the middle of the Southern Indian Ocean.
The solubilities of elements exhibit high values, generally greater than
70%, and Ti remains the least soluble element. Because the Southern
Indian Ocean is remote from its dust sources, only a fraction of smaller
aerosols reaches the Kerguelen Islands after undergoing several cloud and
chemical processes during their transport, resulting in a drastic increase in
solubility. Finally, we deduced an average soluble iron deposition flux of
27 ± 6 μg m−2 d−1
(~0.5 μmol m−2 d−1) for the studied oceanic
area, taking into account a median iron solubility of
82% ± 18%. |
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