δC variations in tree rings as an indication of severe changes in the urban air quality |
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Authors: | G. Dongarr ,D. Varrica |
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Affiliation: | G. Dongarrà,D. Varrica |
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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 CO2 change in the study urban area. |
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Keywords: | Tree rings Carbon dioxide Urban environment Environmental geochemistry Dendrochemistry Stable carbon isotopes |
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