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Large-scale distribution of Atlantic nitrogen fixation controlled by iron availability

Moore, C. Mark, Mills, Matthew M., Achterberg, Eric P., Geider, Richard J., LaRoche, Julie, Lucas, Mike I., McDonagh, Elaine L., Pan, Xi, Poulton, Alex J., Rijkenberg, Micha J.A., Suggett, David J., Ussher, Simon J. and Woodward, E. Malcolm S. (2009) Large-scale distribution of Atlantic nitrogen fixation controlled by iron availability Nature Geoscience, 2, (12), pp. 867-871. (doi:10.1038/NGEO667).

Record type: Article


Oceanic fixed-nitrogen concentrations are controlled by the balance between nitrogen fixation and denitrification1, 2, 3, 4. A number of factors, including iron limitation5, 6, 7, can restrict nitrogen fixation, introducing the potential for decoupling of nitrogen inputs and losses2, 5, 8. Such decoupling could significantly affect the oceanic fixed-nitrogen inventory and consequently the biological component of ocean carbon storage and hence air–sea partitioning of carbon dioxide2, 5, 8, 9. However, the extent to which nutrients limit nitrogen fixation in the global ocean is uncertain. Here, we examined rates of nitrogen fixation and nutrient concentrations in the surface waters of the Atlantic Ocean along a north–south 10,000 km transect during October and November 2005. We show that rates of nitrogen fixation were markedly higher in the North Atlantic compared with the South Atlantic Ocean. Across the two basins, nitrogen fixation was positively correlated with dissolved iron and negatively correlated with dissolved phosphorus concentrations. We conclude that inter-basin differences in nitrogen fixation are controlled by iron supply rather than phosphorus availability. Analysis of the nutrient content of deep waters suggests that the fixed nitrogen enters North Atlantic Deep Water. Our study thus supports the suggestion that iron significantly influences nitrogen fixation5, and that subsequent interactions with ocean circulation patterns contribute to the decoupling of nitrogen fixation and loss2, 4, 8.

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Published date: 1 November 2009
Organisations: Ocean and Earth Science, National Oceanography Centre,Southampton


Local EPrints ID: 71613
ISSN: 1752-0894
PURE UUID: 34bddadd-30e7-4201-83a4-9e252eac0c17

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Date deposited: 15 Dec 2009
Last modified: 18 Jul 2017 23:59

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Author: C. Mark Moore
Author: Matthew M. Mills
Author: Richard J. Geider
Author: Julie LaRoche
Author: Mike I. Lucas
Author: Elaine L. McDonagh
Author: Xi Pan
Author: Alex J. Poulton
Author: Micha J.A. Rijkenberg
Author: David J. Suggett
Author: Simon J. Ussher
Author: E. Malcolm S. Woodward

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