Article Dans Une Revue Comptes Rendus. Géoscience Année : 2005

Large temperature variations over rapid climatic events in Greenland: a method based on air isotopic measurements

Résumé

During the last glacial, characterized by a rapid climatic variability, the Greenland ice isotope–temperature relationship is biased due to changes in the hydrological cycle. An alternative palaeothermometry method, based on air isotopes, ẟ$^{15}$N and ẟ$^{40}$Ar, provides quantitative estimates of rapid temperature increases and suggests a different shape of rapid events compared to water isotope profiles. The temperature over five Dansgaard–Oeschger events (DO) on the NorthGRIP ice core is reconstructed: DO 18, 19, 20, 23 and 24 associated with warming events of 11, 16, 11, 10 and 16 °C, i.e. roughly twice larger than the amplitude suggested by the water isotopes. Together with similar efforts, our measurements permit to show a large variability between the different DO.

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hal-03103761 , version 1 (23-04-2025)

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Amaelle Landais, Jean Jouzel, Valérie Masson-Delmotte, Nicolas Caillon. Large temperature variations over rapid climatic events in Greenland: a method based on air isotopic measurements. Comptes Rendus. Géoscience, 2005, 337 (10-11), pp.947-956. ⟨10.1016/J.CRTE.2005.04.003⟩. ⟨hal-03103761⟩
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