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Carbon dioxide reconstruction from Tree-ring cellulose
Presented by Ms. Trina BOSE on 17 May 2013 from 09:10 to 09:30
Type: Oral Presentation
Session: Isotopes in Dendrochronolgy
Track: Isotopes in dendrochronology
A geochemical model involving meteorological parameters that govern physiochemical fractionation of carbon isotopes during cellulose production in tree rings has been developed. This model is able to extend the atmospheric partial pressure of carbon dioxide (Ca) data in the tropics and northern sub-tropics at 10 sites to the first decade of the last century where no Ca data were available before 1958. Comparison with the ice core Ca from Law Dome, Antarctica shows that, the difference (Ice-core – Tree-ring) remains low till 1960’s; afterwards it rises until 1931-40 with different amplitudes for different sites. This amplitude correlates well with latitude implying its dependence on the distance from Antarctica. Going backwards from 1930’s this difference decreases continuously passing the uncertainty limit and going negative for a few sites.