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Science 28 January 1994:
Vol. 263. no. 5146, pp. 508 - 511
DOI: 10.1126/science.263.5146.508
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Articles
Glacial-Interglacial Changes in Moisture Sources for Greenland: Influences on the Ice Core Record of Climate
C. D. Charles 1,
D. Rind 2,
J. Jouzel 3,
R. D. Koster 4, and
R. G. Fairbanks 5
1 Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093
2 Goddard Institute for Space Studies, New York, NY 10028
3 Laboratoire de Modelisation du Climat et de I'Environnement, CEA/DSM CE Saclay, 91191 Gif Sur Yvette, France, and Laboratoire de Glaciologie et Geophysique de I'Environnement, CNRS BP96,38402, Saint Martin d'Heres Cedex, France
4 Hydrological Sciences Branch, National Aeronautics and Space Administration/Goddard Space Flight Center, Greenbelt, MD 20904
5 Lamont-Doherty Earth Observatory, Palisades, NY 10964, and Department of Geological Sciences, Columbia University, New York, NY 10025
Large, abrupt shifts in the l8O/16O ratio found in Greenland ice must reflect real features of the climate system variability. These isotopic shifts can be viewed as a result of air temperature fluctuations, but determination of the cause of the changes—the most crucial issue for future climate concerns—requires a detailed understanding of the controls on isotopes in precipitation. Results from general circulation model experiments suggest that the sources of Greenland precipitation varied with different climate states, allowing dynamic atmospheric mechanisms for influencing the ice core isotope shifts.
Submitted on July 27, 1993
Accepted on November 10, 1993
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