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Volcanic ash as an oceanic iron source and sink

Volcanic ash as an oceanic iron source and sink
Volcanic ash as an oceanic iron source and sink
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 modeling, 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 threefold 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.
particle scavenging, thorium, volcanic ash, iron, Eyjafjallajökull, modeling
0094-8276
2732 -2740
Rogan, Nicholas
efbb3699-9ab1-4963-9760-0c58709d9853
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Le Moigne, Frederic A.C.
c40d471e-bfee-4e5a-a8ea-970c5abe705d
Marsay, Chris M.
f18098e4-e58c-4799-a7fc-5d6f8ec95677
Tagliabue, Alessandro
23ecb1dd-3cf4-46eb-b059-637a04f2439b
Williams, Richard G.
2155309e-1c07-4365-b46a-04baeb2fb63c
Rogan, Nicholas
efbb3699-9ab1-4963-9760-0c58709d9853
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Le Moigne, Frederic A.C.
c40d471e-bfee-4e5a-a8ea-970c5abe705d
Marsay, Chris M.
f18098e4-e58c-4799-a7fc-5d6f8ec95677
Tagliabue, Alessandro
23ecb1dd-3cf4-46eb-b059-637a04f2439b
Williams, Richard G.
2155309e-1c07-4365-b46a-04baeb2fb63c

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), 2732 -2740. (doi:10.1002/2016GL067905).

Record type: Article

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 modeling, 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 threefold 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.

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More information

Accepted/In Press date: 1 March 2016
e-pub ahead of print date: 19 March 2016
Published date: March 2016
Keywords: particle scavenging, thorium, volcanic ash, iron, Eyjafjallajökull, modeling
Organisations: Ocean and Earth Science, Marine Biogeochemistry

Identifiers

Local EPrints ID: 390201
URI: http://eprints.soton.ac.uk/id/eprint/390201
ISSN: 0094-8276
PURE UUID: a25b3037-484d-43c7-b713-091a94130311

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Date deposited: 21 Mar 2016 10:16
Last modified: 09 Jan 2022 03:33

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Contributors

Author: Nicholas Rogan
Author: Frederic A.C. Le Moigne
Author: Chris M. Marsay
Author: Alessandro Tagliabue
Author: Richard G. Williams

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