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Past atmospheric CO2 levels and the 13C/12C ratios in tree rings Cover

Past atmospheric CO2 levels and the 13C/12C ratios in tree rings

By:  and    
Open Access
|Jan 1980

Abstract

Intra-ring differences of the 13C/12C ratio in tree rings are found to be very large in four Dutch trees. In some cases differences were measured over 4” ° δ13C. Even the 13C/12C ratio averaged over entire rings sometimes still exhibits abrupt jumps of over 1” ° in δ13C from year to year. Significant correlations of δ13C in tree rings with yearly average temperature and precipitation are found. Responses of the atmosphere to a 13C labelled input of CO2 are calculated in 3½ box perturbation model, consisting of an atmosphere, a biosphere, an oceanic mixed layer and a leak of the perturbation to the deep seas. The average 13C record obtained from the four trees is interpreted in terms of past biospheric growth and shrinkage by using the 3½ box model.

Language: English
Page range: 268 - 283
Submitted on: Jun 20, 1979
Accepted on: Dec 4, 1979
Published on: Jan 1, 1980
Published by: Stockholm University Press
In partnership with: Paradigm Publishing Services

© 1980 Pieter P. Tans, Wim G. Mook, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.