Atmospheric C changes resulting from fossil fuel CO2 release and cosmic ray flux variability

Details Atmospheric C changes resulting from fossil fuel CO2 release and cosmic ray flux variability Atmospheric C changes resulting from fossil fuel CO2 release and cosmic ray flux variability

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..53..349s&link_type=abstract

Earth and Planetary Science Letters, vol. 53, no. 3, May 1981, p. 349-362.

Computer Science

53

Atmospheric Composition, Carbon Cycle, Carbon Dioxide, Carbon 14, Cosmic Rays, Fossil Fuels, Air Pollution, Air Water Interactions, Atmospheric Diffusion, Atmospheric Models, Fuel Combustion, Man Environment Interactions, Solar Activity Effects, Solar Terrestrial Interactions, Solar Wind, Trees (Plants), Turbulent Diffusion, Variability, Washington

Scientific paper

A high-precision tree-ring record of the atmospheric C-14 levels between 1820 and 1954 is presented. Good agreement is obtained between measured and model calculated 19th and 20th century atmospheric delta C-14 levels when both fossil fuel CO2 release and predicted natural variations in C-14 production are taken into account. The best fit is obtained by using a box-diffusion model with an oceanic eddy diffusion coefficient of 3 sq cm/s, a CO2 atmosphere-ocean gas exchange rate of 21 moles/sq m yr and biospheric residence time of 60 years. For trees in the state of Washington the measured 1949-1951 atmospheric delta C-14 level was 20.0 + or - 1.2% below the 1855-1864 level. Model calculations indicate that in 1950 industrial CO2 emissions are responsible for at least 85% of the delta C-14 decline, whereas natural variability accounts for the remaining 15%.

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