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.
Dongarrà, G., Varrica, D. (2002). δ13C variations in tree rings as an indication of severe changes in the urban air quality. ATMOSPHERIC ENVIRONMENT, 36, 5887-5896 [10.1016/S1352-2310(02)00824-5].
δ13C variations in tree rings as an indication of severe changes in the urban air quality
DONGARRA', Gaetano;VARRICA, Daniela
2002-01-01
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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