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Trends of 13C/12C Ratios in Pinyon Tree Rings of the American Southwest and the Global Carbon Cycle

Published online by Cambridge University Press:  18 July 2016

S W Leavitt  and
Austin Long
S W Leavitt
Affiliation:
Division of Science, University of Wisconsin-Parkside Kenosha, Wisconsin 53141
Austin Long
Affiliation:
Division of Science, University of Wisconsin-Parkside Kenosha, Wisconsin 53141
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Abstract

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An accurate atmospheric 13C/12C chronology can provide important constraints to models of the global carbon cycle. Trees accumulate carbon from atmospheric CO2 into growth rings and offer potential for 13C/12C reconstructions, but results have not been reproducible. This paper presents δ13C curves from 5 sites, representing 20 pinyon (Pinus edulis) trees, where cores of 4 trees from each site have been pooled into a composite sample. Isotopic analysis of cellulose in 5-yr ring groups produces curves with a general trend of decreasing δ13C after 1800, but with pronounced short-term fluctuations superimposed upon the trend. Evidence indicates the fluctuations are strongly related to moisture availability (drought). A mean curve of the 5 δ13C chronologies from which the fossil-fuel component is subtracted suggests a substantial biospheric CO2 contribution to the atmosphere since 1800.

Type
III. The Carbon Cycle
Information
Radiocarbon , Volume 28 , Issue 2A , 1986 , pp. 376 - 382
Copyright
Copyright © The American Journal of Science 

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