doi: 10.1073/pnas.71.6.2482.
Temperature dependence of isotope ratios in tree rings
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- PMID:16592163
- PMCID: PMC388483
- DOI: 10.1073/pnas.71.6.2482
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Temperature dependence of isotope ratios in tree rings
L M Libby et al. Proc Natl Acad Sci U S A.1974 Jun.
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Abstract
The stable isotope ratios of carbon, oxygen, and hydrogen have been measured for a German oak in wood samples of roughly three years each, for the years 1712-1954 A.D., and correlated with the existing weather records from England, Basel, and Geneva to evaluate the empirical temperature coefficients. Isotope ratios in a second official oak, measured for the years 1530-1800 A.D., show the cold temperatures of the Little Ice Age interspersed with warm intervals.
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