Lack of dissolved iron in the sea limits biological productivity and the uptake of carbon dioxide. The sources of dissolved iron in the North Atlantic Ocean have been identified from isotopic variations of this trace nutrient. See Letter p.212
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Resing, J., Barrett, P. Fingerprints of a trace nutrient. Nature 511, 164–165 (2014). https://doi.org/10.1038/nature13513
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DOI: https://doi.org/10.1038/nature13513