Estimating allowable carbon emission for CO2 concentration stabilization using a GCM-based Earth system model
Article first published online: 9 OCT 2009
Copyright 2009 by the American Geophysical Union.
Geophysical Research Letters
Volume 36, Issue 19, October 2009
How to Cite
2009), Estimating allowable carbon emission for CO2 concentration stabilization using a GCM-based Earth system model, Geophys. Res. Lett., 36, L19709, doi:10.1029/2009GL039678., and (
- Issue published online: 9 OCT 2009
- Article first published online: 9 OCT 2009
- Manuscript Accepted: 2 SEP 2009
- Manuscript Revised: 12 AUG 2009
- Manuscript Received: 19 JUN 2009
- carbon cycle;
- global warming
 For atmospheric CO2 concentration stabilization, we projected allowable carbon emission with an Earth system model based on a general circulation model. Our calculations on centennial timescale in various scenarios reveal how saturation with respect to CO2 and climate-carbon cycle feedback reduce natural carbon uptake, and hence allowable emission. In 450 ppm stabilization scenario, for example, climate-carbon cycle feedback reduces the accumulative allowable carbon emission until year 2300 from 1248 to 980 PgC. The Emission at the year 2050 is about the half of the year 2000 level for the SP450 scenario. Terrestrial carbon cycle is especially susceptible to climate-carbon cycle feedback, and is a significant source of projection uncertainty. Our model responds nonlinearly to CO2 and climate, suggesting process-based models are indispensable tool for future climate-carbon cycle projections.