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

Le Moigne, Frédéric A.C.; Moore, C. Mark; Sanders, Richard J.; Villa-Alfageme, Maria; Steigenberger, Sebastian; 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. 10.1002/2014GL060308

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Abstract/Summary

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.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1002/2014GL060308
ISSN: 00948276
Additional Keywords: carbon export; North Atlantic; Iron limitation
Date made live: 23 Jun 2014 10:55 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/507539

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