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Published August 19, 1994 | metadata_only
Journal Article

Climatic Implications of an 8000-Year Hydrogen Isotope Time Series from Bristlecone Pine Trees


Tree rings from three dendrochronologically dated bristlecone pines were analyzed for stable hydrogen isotopic composition. These trees give a continuous time series from 8000 years ago to the present that indicates the presence of a postglacial climate optimum 6800 years ago and a continuous cooling since then. The qualitative agreement between this record and records from other sources, such as ice cores, pollen, and treeline fluctuations, indicates that these climate changes were global. This record can serve as a reference for other climate indicators throughout the past 8000 years.

Additional Information

© 1994 American Association for the Advancement of Science. Received 22 March 1994; accepted 29 June 1994. Supported by NSF grant ATM9219891 and by the U.S. Department of Energy under Cooperative Agreement Award DE-FC03-90ER61010. The samples were provided by M. Hughes at the Tree Ring Laboratory, University of Arizona, Tucson, Arizona. We also thank D. A. Graybill, E. Dent, and X. Xu for technical support

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August 20, 2023
August 20, 2023