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2004
Landais, A, Caillon N, Severinghaus J, Barnola JM, Goujon C, Jouzel J, Masson-Delmotte V.  2004.  Isotopic measurements of air trapped in ice to quantify temperature changes. Comptes Rendus Geoscience. 336:963-970.   10.1016/j.crte.2004.03.013   AbstractWebsite

Isotopic measurements of air trapped in ice to quantify temperature changes. Isotopic measurements in polar ice core have shown a succession of rapid warming periods during the last glacial period over Greenland. However, this method underestimates the surface temperature variations. A new method based on gas thermal diffusion in the firn manages to quantify surface temperature variations through associated isotopic fractionations. We developed a method to extract air from the ice and to perform isotopic measurements to reduce analytical uncertainties to 0.006 and 0.020parts per thousand for delta(15)N and delta(40)Ar. It led to a 16 +/- 1.5degreesC surface temperature variation during a rapid warming (-70000 yr). (C) 2004 Academie des sciences. Publie par Elsevier SAS. Tous droits reserves.