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 (C-effx), vary widely. Such variability in C-effx has frequently been attributed to estimate uncertainty rather than intrinsic variability. Here we derive ne...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Le Moigne, Frederic A. C., Moore, C. Mark, Sanders, Richard J., Villa-alfageme, Maria, Steigenberger, Sebastian, Achterberg, Eric P.
Format: Text
Language:English
Published: Amer Geophysical Union 2014
Subjects:
envir
geo
North Atlantic
Online Access:https://doi.org/10.1002/2014GL060308
https://archimer.ifremer.fr/doc/00290/40112/39249.pdf
https://archimer.ifremer.fr/doc/00290/40112/39250.docx
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Summary: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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