Volcanic ash as an oceanic iron source and sink

Rogan, Nicholas, Achterberg, Eric P., Le Moigne, Frederic A. C., Marsay, Chris M., Tagliabue, Alessandro and Williams, Richard G. (2016) Volcanic ash as an oceanic iron source and sink Geophysical Research Letters, 43 (6). pp. 2732-2740. DOI 10.1002/2016GL067905.

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Abstract

Volcanic ash deposition to the ocean forms a natural source of iron (Fe) to surface water microbial communities. Inputs of lithogenic material may also facilitate Fe removal through scavenging. Combining dissolved Fe (dFe) and thorium-234 observations alongside modelling, we investigate scavenging of Fe in the North Atlantic following the Eyjafjallajökull volcanic eruption. Under typical conditions biogenic particles dominate scavenging, whereas ash particles dominate during the eruption. The size of particles is important as smaller scavenging particles can become saturated with surface-associated ions. Model simulations indicate that ash deposition associated with Eyjafjallajökull likely led to net Fe removal. Our model suggests a three-fold greater stimulation of biological activity if ash deposition had occurred later in the growing season when the region was Fe-limited. The implications of ash particle-scavenging, eruption timing and particle saturation need to be considered when assessing the impact of ash deposition on the ocean Fe cycle and productivity.

Document Type: Article
Additional Information: WOS:000374697200049
Keywords: particle scavenging; thorium; volcanic ash; iron; Eyjafjallajökull; modelling
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
DOI etc.: 10.1002/2016GL067905
ISSN: 0094-8276
Projects: SOPRAN, Future Ocean
Date Deposited: 07 Mar 2016 13:24
Last Modified: 10 Apr 2017 07:53
URI: http://eprints.uni-kiel.de/id/eprint/31714

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