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- W123543832 abstract "The increase of CO$sub 2$ in the atmosphere due to human activities is investigated by means of the stable carbon isotope record in modern wood. This is possible, because fossil fuels are labelled rather uniformly by a $sup 13$C- deficit of about 18 percent relative to atmospheric CO$sub 2$. For the isotopic analysis cellulose was isolated from wood. Each sample, representing a five-year average, was measured after burning to CO$sub 2$ by means of mass spectrometry. Difficulties arise mainly from two sources: first, growth conditions are probably superimposed upon the expected trend, especially in the first years of the tree; and second, an isotopic exchange between atmospheric CO$sub 2$ and other geological carbon reservoirs may occur without any net flux. A regression curve, calculated for the last 60 years of an average of several freestanding trees, shows a delta$sup 13$C decrease of only 0.3$sup 0$/$sub 00$. This does not mean, however, that the CO$sub 2$ excess in the atmosphere is only 12 percent of the man-made carbon dioxide, because the exchange of CO$sub 2$ with marine bicarbonate lowers the delta$sup 13$C labelling. Using a simple two-box model, consisting of atmosphere and ocean, a value of 30 percent for the excessmore » CO$sub 2$ still present becomes more likely corresponding to an average residence time of 3.4 years for a CO$sub 2$ molecule in the atmosphere. (auth)« less" @default.
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- W123543832 date "1975-01-01" @default.
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- W123543832 title "Anthropogenic carbon-13 decrease in atmospheric carbon dioxide as recorded in modern wood" @default.
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