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American Geophysical Union, Geophysical Research Letters, 13(41), p. 4619-4627, 2014

DOI: 10.1002/2014gl060308

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

Journal article published in 2014 by Frederic A. C. Le Moigne, C. Mark Moore, Richard J. Sanders, Maria Villa-Alfageme, Sebastian Steigenberger, Eric P. Achterberg
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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 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 Ceffx may be related to the mode of Fe delivery.