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Carbon-Concentration and Carbon-Climate Feedbacks in CMIP5 Earth System Models.
- Source :
- Journal of Climate; Aug2013, Vol. 26 Issue 15, p5289-5314, 26p, 2 Charts, 11 Graphs
- Publication Year :
- 2013
-
Abstract
- The magnitude and evolution of parameters that characterize feedbacks in the coupled carbon-climate system are compared across nine Earth system models (ESMs). The analysis is based on results from biogeochemically, radiatively, and fully coupled simulations in which CO<subscript>2</subscript> increases at a rate of 1% yr<superscript>−1</superscript>. These simulations are part of phase 5 of the Coupled Model Intercomparison Project (CMIP5). The CO<subscript>2</subscript> fluxes between the atmosphere and underlying land and ocean respond to changes in atmospheric CO<subscript>2</subscript> concentration and to changes in temperature and other climate variables. The carbon-concentration and carbon-climate feedback parameters characterize the response of the CO<subscript>2</subscript> flux between the atmosphere and the underlying surface to these changes. Feedback parameters are calculated using two different approaches. The two approaches are equivalent and either may be used to calculate the contribution of the feedback terms to diagnosed cumulative emissions. The contribution of carbon-concentration feedback to diagnosed cumulative emissions that are consistent with the 1% increasing CO<subscript>2</subscript> concentration scenario is about 4.5 times larger than the carbon-climate feedback. Differences in the modeled responses of the carbon budget to changes in CO<subscript>2</subscript> and temperature are seen to be 3-4 times larger for the land components compared to the ocean components of participating models. The feedback parameters depend on the state of the system as well the forcing scenario but nevertheless provide insight into the behavior of the coupled carbon-climate system and a useful common framework for comparing models. [ABSTRACT FROM AUTHOR]
- Subjects :
- CARBON
CLIMATOLOGY
COMPUTER simulation
BIOGEOCHEMICAL cycles
CLIMATE change
Subjects
Details
- Language :
- English
- ISSN :
- 08948755
- Volume :
- 26
- Issue :
- 15
- Database :
- Complementary Index
- Journal :
- Journal of Climate
- Publication Type :
- Academic Journal
- Accession number :
- 89396241
- Full Text :
- https://doi.org/10.1175/JCLI-D-12-00494.1