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- W2079743050 abstract "A high-precision tree-ring record of the atmospheric14C levels between 1820 and 1954 is presented. Good agreement is obtained between measured and model calculated 19th and 20th century atmospheric Δ14C levels when both fossil fuel CO2 release and predicted natural variations in14C production are taken into account. The best fit is obtained by using a ☐-diffusion model with an oceanic eddy diffusion coefficient of 3 cm2/s, a CO2 atmosphere-ocean gas exchange rate of 21 moles m−2 yr−1 and biospheric residence time of 60 years. For trees in the state of Washington the measured 1949–1951 atmospheric Δ14C level was20.0±1.2%. below the 1855–1864 level. Model calculations indicate that in 1950 industrial CO2 emissions are responsible for at least 85% of the Δ14C decline, whereas natural variability accounts for the remaining 15%." @default.
- W2079743050 created "2016-06-24" @default.
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- W2079743050 date "1981-05-01" @default.
- W2079743050 modified "2023-10-16" @default.
- W2079743050 title "Atmospheric14C changes resulting from fossil fuel CO2 release and cosmic ray flux variability" @default.
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- W2079743050 doi "https://doi.org/10.1016/0012-821x(81)90040-6" @default.
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