Abstract
Annual growth rings sampled from three free-standing trees ( Platanus hybrida sp.), grew in the metropolitan area of Palermo (Italy) and covering a 118 years time span (1880–1998), have been studied for their 13C/ 12C carbon isotope ratios. It has been found that the 13C/ 12C tree ring record, during the study time interval, decreased of −3.6‰, from −26.4‰ in 1880 to −30‰ in 1998. Such a progressive depletion has been attributed to the addition of anthropogenic 13C depleted carbon dioxide to the local atmosphere. The observed 13C/ 12C decrease has been used to infer some possible pathways of atmospheric CO 2 change in the study urban area.
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