Atmos. Chem. Phys. Discuss., 10, 711-734, 2010
www.atmos-chem-phys-discuss.net/10/711/2010/
doi:10.5194/acpd-10-711-2010
© Author(s) 2010. This work is distributed
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Volcanic ash as fertiliser for the surface ocean
B. Langmann1, K. Zakšek1, M. Hort1, and S. Duggen2
1Institute of Geophysics, University of Hamburg, KlimaCampus, Hamburg, Germany
2Leibniz Institute of Marine Sciences, IFM-GEOMAR, Kiel, Germany

Abstract. Iron is a key limiting micro-nutrient for marine primary productivity. It can be supplied to the ocean by atmospheric dust deposition. Volcanic ash deposition into the ocean represents another external and so far largely neglected source of iron. This study demonstrates strong evidence for natural fertilisation in the iron-limited oceanic area of the NE Pacific, induced by volcanic ash from the eruption of Kasatochi volcano in August 2008. Atmospheric and oceanic conditions were favourable to generate a massive phytoplankton bloom in the NE Pacific Ocean which for the first time establishes a causal connection between oceanic iron-fertilisation and volcanic ash supply.

Citation: Langmann, B., Zakšek, K., Hort, M., and Duggen, S.: Volcanic ash as fertiliser for the surface ocean, Atmos. Chem. Phys. Discuss., 10, 711-734, doi:10.5194/acpd-10-711-2010, 2010.
 
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