Revised Estimates of Atmospheric CO2 Variations Based on the Tree-Ring 13C Record

  • Tsung-Hung Peng
  • Hans D. Freyer


Since the publication of a paper by Peng et al. (1983) regarding the analysis of the tree-ring-based δ13C record,* a number of reports giving new measurements of δ13C in tree rings have emerged (Leavitt and Long 1983; Stuiver et al. 1984; Freyer, this volume; Stuiver, this volume). The results of the original analysis were based on a global 13C/12C trend compiled by Freyer and Belacy (1983). Freyer (this volume) recalculated the 13C/12C trend of the Northern Hemisphere using measurements on 65 trees, including those presented in the publication of Leavitt and Long (1983), and he concluded that no long-term trend exists during the period of a few centuries before 1800 AD. By contrast, a clear trend of decreasing 13C was observed after 1800 AD. Freyer estimated the overall decrease of δ13C from 1800 to 1980 AD to be about −1.5‰, which is 0.5‰ less than that obtained from the composite 13C trend used by Peng et al. (1983). Therefore, a reevaluation of the terrestrial biosphere contribution to the lowering of δ13C in the atmospheric CO2 seems appropriate. This is the main objective of this chapter.


Fossil Fuel Tree Ring Terrestrial Biosphere Land Biosphere Ocean Carbon Cycle Model 
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© Springer Science+Business Media New York 1986

Authors and Affiliations

  • Tsung-Hung Peng
  • Hans D. Freyer

There are no affiliations available

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