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| Titel |
The role of airborne volcanic ash for the surface ocean biogeochemical iron-cycle: a review |
| VerfasserIn |
S. Duggen, N. Olgun, P. Croot, L. Hoffmann, H. Dietze, P. Delmelle, C. Teschner |
| 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 ; 7, no. 3 ; Nr. 7, no. 3 (2010-03-03), S.827-844 |
| Datensatznummer |
250004578
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| Publikation (Nr.) |
 copernicus.org/bg-7-827-2010.pdf |
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| Zusammenfassung |
| Iron is a key micronutrient for phytoplankton growth in the surface ocean.
Yet the significance of volcanism for the marine biogeochemical iron-cycle
is poorly constrained. Recent studies, however, suggest that offshore
deposition of airborne ash from volcanic eruptions is a way to inject
significant amounts of bio-available iron into the surface ocean. Volcanic
ash may be transported up to several tens of kilometers high into the
atmosphere during large-scale eruptions and fine ash may stay aloft for days
to weeks, thereby reaching even the remotest and most iron-starved oceanic
regions. Scientific ocean drilling demonstrates that volcanic ash layers and
dispersed ash particles are frequently found in marine sediments and that
therefore volcanic ash deposition and iron-injection into the oceans took
place throughout much of the Earth's history. Natural evidence and the data
now available from geochemical and biological experiments and satellite
techniques suggest that volcanic ash is a so far underestimated source for
iron in the surface ocean, possibly of similar importance as aeolian dust.
Here we summarise the development of and the knowledge in this fairly young
research field. The paper covers a wide range of chemical and biological
issues and we make recommendations for future directions in these areas. The
review paper may thus be helpful to improve our understanding of the role of
volcanic ash for the marine biogeochemical iron-cycle, marine primary
productivity and the ocean-atmosphere exchange of CO2 and other gases
relevant for climate in the Earth's history. |
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