Séminaire IGE

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Interfaces: Revisiting the Nitrogen Cycle Through the Study of Stable Nitrogen Isotopes in Nitrate and Marine Biocarbonates

vendredi 22 mars 2024 - 13h30

Nicolas Duprey - Max Planck Institute for Chemistry
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The study of stable nitrogen isotopes has revolutionized our understanding of the nitrogen cycle by leveraging isotopic fractionation associated with various processes governing the nitrogen cycle. Recent analytical developments have enabled the measurement of stable isotopes (N and O) in nitrate molecules, which constitute the majority of nitrogen available for life in the oceans. These data help unravel the dynamics of the nitrogen cycle in oceans, identifying key processes and nitrogen sources within the system. Moreover, the ability to measure stable nitrogen isotopes in the aragonitic or calcitic matrix of marine biocarbonates, such as corals or foraminifera, offers a novel perspective on the past variability of the nitrogen cycle across timescales from decades to millions of years. This seminar provides a brief overview of nitrogen isotope systematics and showcases practical applications in three main themes: 1) natural variability of the nitrogen cycle, 2) anthropogenic forcings, and 3) impact and resilience of ecosystems and organisms.

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Equipe organisatrice : Organisation labo

Salle Lliboutry, IGE Glaciologie, 38400 Saint Martin d'Hères

Informations de visio :

Register here : https://univ-grenoble-alpes-fr.zoom.us/meeting/register/tJMvdu2opz8jHd2lTeg8i9W1A1EuJftY4CpJ#/registration