Nitrogen Isotopes in the Ocean

D. M. Sigman, F. Fripiat

Research output: Chapter in Book/Report/Conference proceedingChapter

13 Scopus citations

Abstract

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.

Original languageEnglish (US)
Title of host publicationEncyclopedia of Ocean Sciences, Third Edition
Subtitle of host publicationVolume 1-5
PublisherElsevier
PagesV1-263-V1-278
Volume1-5
ISBN (Electronic)9780128130827
DOIs
StatePublished - Jan 1 2019

All Science Journal Classification (ASJC) codes

  • General Earth and Planetary Sciences

Keywords

  • Ammonium
  • Assimilation
  • Denitrification
  • Dissolved organic nitrogen
  • Fixed nitrogen
  • Isotope fractionation
  • Nitrate
  • Nitrification
  • Nitrogen budget
  • Nitrogen fixation
  • Nutrient
  • Particulate nitrogen
  • Phytoplankton
  • Sediment

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