Long term fate of anthropogenic carbon

Details Long term fate of anthropogenic carbon Long term fate of anthropogenic carbon

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3419707m&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 19, CiteID L19707

Other

15

Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912), Global Change: Earth System Modeling (1225), Global Change: Impacts Of Global Change (1225), Global Change: Global Climate Models (3337, 4928), Biogeosciences: Carbon Cycling (4806)

Scientific paper

Two earth-system models of intermediate complexity are used to study the long term response to an input of 5000 Pg of carbon into the atmosphere. About 75% of CO2 emissions have an average perturbation lifetime of 1800 years and 25% have lifetimes much longer than 5000 years. In the simulations, higher levels of atmospheric CO2 remain in the atmosphere than predicted by previous experiments and the average perturbation lifetime of atmospheric CO2 for this level of emissions is much longer than the 300-400 years proposed by other studies. At year 6800, CO2 concentrations between about 960 to 1440 ppmv result in global surface temperature increases between 6 and 8°C. There is also significant surface ocean acidification, with pH decreasing from 8.16 to 7.46 units between years 2000 and 2300.

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