J. Phys. IV France 107 (2003) 241
Strontium isotope measurements in Greenland ice from the last glacial maximum to the early HoloceneG.R. Burton1, C.F. Boutron2, S. Hong3, J.-P. Candelone1 and K.J.R. Rosman1
1 Department of Applied Physics, Curtin University of Technology, P.O. Box U1987, Perth 6845, Australia
2 Laboratoire de Glaciologie et Géophysique de l'Environnement du CNRS, 54 rue Molière, Domaine Universitaire, BP. 96, 38402 Saint-Martin-d'Hères cedex, France
3 Polar Sciences Laboratory, Korea Ocean Research & Development Institute, Ansan, P.O. Box 29, Seoul 425-600, Korea
Strontium isotopic composition and concentration have been measured by thermal ionisation mass spectrometry on a suite of samples from the GRIP ice core drilled at Summit, Greenland. The sample ages range from ~24 to ~7.3 ky BP extending from the last glacial maximum into the early Holocene. Less than 10 g of sample was used for each analysis. No attempt was made to separate soluble/insoluble species in the samples. Sr concentrations are between ~950 and ~1,550 pg.g -1 over the period ~24 ky to ~14 ky BP but fall dramatically to generally less than 150 pg.g -1 between ~14 to ~7.3 ky BP. The 87Sr/ 86Sr ratio shows a general rising trend from ~0.712 to ~0.715 over the entire period however there are a number of significant deviations from this trend which are most likely due to changing source regions for aerosol dust input to Greenland. Sr isotopic composition shows a strong correlation with O suggesting that climate plays a strong role in determining regions for dust release.
© EDP Sciences 2003