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Provedor de dados:  ArchiMer
País:  France
Título:  Dissolved organic nitrogen production and export by meridional overturning in the eastern subpolar North Atlantic
Autores:  Fernández-castro, Bieito
Álvarez, Marta
Nieto-cid, Mar
Zunino, Patricia
Mercier, Herle
Álvarez-salgado, Xosé Antón
Data:  2019-04
Ano:  2019
Palavras-chave:  Dissolved organic matter
Nitrogen cycle
Meridional overturning circulation
Subpolar North Atlantic
Metabolic balance
Resumo:  Dissolved organic matter (DOM) is produced in the surface and exported towards the deep ocean, adding ∼2 PgC yr−1 to the global carbon export. Due to its central role in the Meridional Overturning Circulation (MOC), the eastern subpolar North Atlantic (eSPNA) contributes largely to this export. Here we quantify the transport and budget of dissolved organic nitrogen (DON) in the eSPNA, in a box delimited by the OVIDE 2002 section and the Greenland‐Iceland‐Scotland sills. The MOC exports >15.9 TgN yr−1 of DON downwards and, contrary to the extended view that these are materials of subtropical origin, up to 33% of the vertical flux derives from a net local DON production of 7.1 ± 2.6 TgN yr−1. The low C:N molar ratio of DOM production (7.4 ± 4.1) and the relatively short‐transit times in the eSPNA (3 ± 1 yr) suggest that local biogeochemical transformations result in the injection of fresh bioavailable DOM to the deep ocean.
Tipo:  Text
Idioma:  Inglês

Editor:  American Geophysical Union (AGU)
Formato:  application/pdf
Fonte:  Geophysical Research Letters (0094-8276) (American Geophysical Union (AGU)), 2019-04 , Vol. 46 , N. 7 , P. 3832-3842
Direitos:  info:eu-repo/semantics/openAccess

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