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Sequestration efficiency in the iron limited North Atlantic: Implications for iron supply mode to fertilized blooms

Sequestration efficiency in the iron limited North Atlantic: Implications for iron supply mode to fertilized blooms
Sequestration efficiency in the iron limited North Atlantic: Implications for iron supply mode to fertilized blooms
Estimates of the amount of carbon sequestered in the ocean interior per unit iron (Fe) supplied, as quantified by the sequestration efficiency (Ceffx), vary widely. Such variability in Ceffx has frequently been attributed to estimate uncertainty rather than intrinsic variability. Here we derive new estimates of Ceffx for the subpolar North Atlantic, where Fe stressed conditions have recently been demonstrated. Derived values of Ceffx from across the region, including areas subject to atypical external Fe fertilization events during the year of sample collection (2010), ranged from 17 - 19 kmol C (mol Fe-1). Comparing these estimates with values from other systems, considered in the context of variable bloom durations in the different oceanographic settings, we suggest that apparent variability in Ceffx may be related to the mode of Fe delivery.
carbon export, North Atlantic, Iron limitation
0094-8276
4619-4627
Le Moigne, Frédéric A.C.
1b829241-e3de-4e3f-9bb7-c9b65bb2cb64
Moore, C. Mark
7ec80b7b-bedc-4dd5-8924-0f5d01927b12
Sanders, Richard J.
02c163c1-8f5e-49ad-857c-d28f7da66c65
Villa-Alfageme, Maria
9698af3e-9fca-4f34-86a9-1e458c0507e6
Steigenberger, Sebastian
15c989b8-dd0d-454c-b3cc-08d4290eaff0
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Le Moigne, Frédéric A.C.
1b829241-e3de-4e3f-9bb7-c9b65bb2cb64
Moore, C. Mark
7ec80b7b-bedc-4dd5-8924-0f5d01927b12
Sanders, Richard J.
02c163c1-8f5e-49ad-857c-d28f7da66c65
Villa-Alfageme, Maria
9698af3e-9fca-4f34-86a9-1e458c0507e6
Steigenberger, Sebastian
15c989b8-dd0d-454c-b3cc-08d4290eaff0
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9

Le Moigne, Frédéric A.C., Moore, C. Mark, Sanders, Richard J., Villa-Alfageme, Maria, Steigenberger, Sebastian and Achterberg, Eric P. (2014) Sequestration efficiency in the iron limited North Atlantic: Implications for iron supply mode to fertilized blooms. Geophysical Research Letters, 41 (13), 4619-4627. (doi:10.1002/2014GL060308).

Record type: Article

Abstract

Estimates of the amount of carbon sequestered in the ocean interior per unit iron (Fe) supplied, as quantified by the sequestration efficiency (Ceffx), vary widely. Such variability in Ceffx has frequently been attributed to estimate uncertainty rather than intrinsic variability. Here we derive new estimates of Ceffx for the subpolar North Atlantic, where Fe stressed conditions have recently been demonstrated. Derived values of Ceffx from across the region, including areas subject to atypical external Fe fertilization events during the year of sample collection (2010), ranged from 17 - 19 kmol C (mol Fe-1). Comparing these estimates with values from other systems, considered in the context of variable bloom durations in the different oceanographic settings, we suggest that apparent variability in Ceffx may be related to the mode of Fe delivery.

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Accepted/In Press date: 18 June 2014
e-pub ahead of print date: 8 July 2014
Published date: 16 July 2014
Keywords: carbon export, North Atlantic, Iron limitation
Organisations: Ocean and Earth Science, Marine Biogeochemistry

Identifiers

Local EPrints ID: 366212
URI: http://eprints.soton.ac.uk/id/eprint/366212
ISSN: 0094-8276
PURE UUID: 9adb79af-de88-4864-8f62-0b79caeb866a

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Date deposited: 23 Jun 2014 10:50
Last modified: 16 Dec 2019 20:24

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