par Sigman, Daniel M;Fripiat, François 
Editeur scientifique Cochran, J.K.;Bokuniewicz, H.J.;Yager, P.L.
Référence Encyclopedia of Ocean Sciences, Elsevier, Oxford, Vol. 1, Ed. 3, Marine Biogeochemistry, page (263-278)
Publication Publié, 2019-03-13
Editeur scientifique Cochran, J.K.;Bokuniewicz, H.J.;Yager, P.L.
Référence Encyclopedia of Ocean Sciences, Elsevier, Oxford, Vol. 1, Ed. 3, Marine Biogeochemistry, page (263-278)
Publication Publié, 2019-03-13
Partie d'ouvrage collectif
| Résumé : | This article outlines the isotope systematics of processes in the ocean nitrogen (N) cycle and their impact on the isotopic compositions of the major N forms, with an eye toward how the N isotopes may record current N fluxes and past changes. The dominant dynamic is of kinetic isotope discrimination, in which the light isotope of N (14N) is preferentially converted from substrate to product, leaving the substrate enriched in 15N. The strength of the isotopic signal increases with the amplitude of the isotope discrimination in a given N conversion, and it is also affected by the degree to which that conversion consumes its substrate, with a higher degree of consumption strengthening the signal in the substrate but weakening it in the product. |
