Abstract
Intra-ring differences of the 13 C/ 12 C ratio in tree rings are found to be very large in four Dutch trees. In some cases differences were measured over 4‰ ? 13 C. Even the 13 C/ 12 C ratio averaged over entire rings sometimes still exhibits abrupt jumps of over 1‰ in ? 13 C from year to year. Significant correlations of ? 13 C in tree rings with yearly average temperature and precipitation are found. Responses of the atmosphere to a 13 C labelled input of CO 2 are calculated in 3 1/2 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 13 C record obtained from the four trees is interpreted in terms of past biospheric growth and shrinkage by using the 3 1/2 box model. DOI: 10.1111/j.2153-3490.1980.tb00954.x
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