Importance of salt fingering for new nitrogen supply in the oligotrophic ocean

Nature Communications
B Fernández-CastroR Simó

Abstract

The input of new nitrogen into the euphotic zone constrains the export of organic carbon to the deep ocean and thereby the biologically mediated long-term CO2 exchange between the ocean and atmosphere. In low-latitude open-ocean regions, turbulence-driven nitrate diffusion from the ocean's interior and biological fixation of atmospheric N2 are the main sources of new nitrogen for phytoplankton productivity. With measurements across the tropical and subtropical Atlantic, Pacific and Indian oceans, we show that nitrate diffusion (171±190 μmol m(-2) d(-1)) dominates over N2 fixation (9.0±9.4 μmol m(-2) d(-1)) at the time of sampling. Nitrate diffusion mediated by salt fingers is responsible for ca. 20% of the new nitrogen supply in several provinces of the Atlantic and Indian Oceans. Our results indicate that salt finger diffusion should be considered in present and future ocean nitrogen budgets, as it could supply globally 0.23-1.00 Tmol N yr(-1) to the euphotic zone.

References

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Jul 24, 2008·Proceedings of the National Academy of Sciences of the United States of America·A SubramaniamD G Capone
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Citations

Dec 3, 2016·Scientific Reports·Thomas VannierOlivier Jaillon
Aug 16, 2018·Proceedings of the National Academy of Sciences of the United States of America·Eric J RaesAnya M Waite
Sep 24, 2021·Scientific Reports·Beatriz Mouriño-CarballidoMarina Villamaña

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