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

Type Article
Date 2014-07-16
Language English
Author(s) Le Moigne Frederic A. C.1, Moore C. Mark2, Sanders Richard J.1, Villa-Alfageme Maria3, Steigenberger Sebastian2, Achterberg Eric P.2, 4
Affiliation(s) 1 : Natl Oceanog Ctr, Southampton, Hants, England.
2 : Univ Southampton, Southampton, Hants, England.
3 : Univ Seville, Dept Fis Aplicada 2, Seville, Spain.
4 : Helmholtz Ctr Ocean Res Kiel, GEOMAR, Kiel, Germany.
Source Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2014-07-16 , Vol. 41 , N. 13 , P. 4619-4627
DOI 10.1002/2014GL060308
WOS© Times Cited 13
Abstract Estimates of the amount of carbon sequestered in the ocean interior per unit iron (Fe) supplied, as quantified by the sequestration efficiency (C-effx), vary widely. Such variability in C-effx has frequently been attributed to estimate uncertainty rather than intrinsic variability. Here we derive new estimates of C-effx for the subpolar North Atlantic, where Fe stressed conditions have recently been demonstrated. Derived values of C-effx from across the region, including areas subject to atypical external Fe fertilization events during the year of sample collection (2010), ranged from 17 to 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 C-effx may be related to the mode of Fe delivery.
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Le Moigne Frederic 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. Publisher's official version : https://doi.org/10.1002/2014GL060308 , Open Access version : https://archimer.ifremer.fr/doc/00290/40112/