Long term fate of anthropogenic carbon
Article first published online: 10 OCT 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 19, October 2007
How to Cite
2007), Long term fate of anthropogenic carbon, Geophys. Res. Lett., 34, L19707, doi:10.1029/2007GL030905., , , , and (
- Issue published online: 10 OCT 2007
- Article first published online: 10 OCT 2007
- Manuscript Accepted: 12 SEP 2007
- Manuscript Revised: 29 AUG 2007
- Manuscript Received: 5 JUN 2007
- global change;
- carbon cycle;
- anthropogenic CO2
 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.