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Les gaz fractionnés de façon thermique dans la glace polaire permettent de situer un changement subit de climat à la fin de la période Younger Dryas.

Timing of abrupt climate change at the end of the Younger Dryas interval from thermally fractionated gases in polar ice.

Auteurs : SEVERINGHAUS J. P., SOWERS T., BROOK E. J., ALLEY R. B., BENDER M. L.

Type d'article : Article

Résumé

Rapid temperature change fractionates gas isotopes in unconsolidated snow, producing a signal that is preserved in trapped air bubbles as the snow forms ice. The fractionation of nitrogen and argon isotopes at the end of the Younger Dryas cold interval recorded in Greenland ice, demonstrates that warming at this time was abrupt. This warming coincides with the onset of a prominent rise in atmospheric methane concentration, indicating that the climate change was synchronous (within a few decades) over a region of at least hemispheric extent, and providing constraints on previously proposed mechanisms of climate change at this time.

Détails

  • Titre original : Timing of abrupt climate change at the end of the Younger Dryas interval from thermally fractionated gases in polar ice.
  • Identifiant de la fiche : 1999-0594
  • Langues : Anglais
  • Source : Nature - vol. 391 - n. 6663
  • Date d'édition : 08/01/1998
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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