%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Buchanan, P. J.
%A Aumont, Olivier
%A Bopp, L.
%A Mahaffey, C.
%A Tagliabue, A.
%T Impact of intensifying nitrogen limitation on ocean net primary production is fingerprinted by nitrogen isotopes
%D 2021
%L fdi:010083323
%G ENG
%J Nature Communications
%M ISI:000712527000013
%N 1
%P 6214 [9 ]
%R 10.1038/s41467-021-26552-w
%U https://www.documentation.ird.fr/hor/fdi:010083323
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2021-12/010083323.pdf
%V 12
%W Horizon (IRD)
%X The open ocean nitrogen cycle is being altered by increases in anthropogenic atmospheric nitrogen deposition and climate change. How the nitrogen cycle responds will determine long-term trends in net primary production (NPP) in the nitrogen-limited low latitude ocean, but is poorly constrained by uncertainty in how the source-sink balance will evolve. Here we show that intensifying nitrogen limitation of phytoplankton, associated with near-term reductions in NPP, causes detectable declines in nitrogen isotopes (delta N-15) and constitutes the primary perturbation of the 21st century nitrogen cycle. Model experiments show that similar to 75% of the low latitude twilight zone develops anomalously low delta N-15 by 2060, predominantly due to the effects of climate change that alter ocean circulation, with implications for the nitrogen source-sink balance. Our results highlight that delta N-15 changes in the low latitude twilight zone may provide a useful constraint on emerging changes to nitrogen limitation and NPP over the 21st century.
%$ 032 ; 021