English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Carbon-concentration and carbon-climate feedbacks in CMIP6 models and their comparison to CMIP5 models

MPS-Authors
/persons/resource/persons37113

Brovkin,  Victor
Climate-Biogeosphere Interaction, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37188

Ilyina,  Tatiana
Ocean Biogeochemistry, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37296

Pongratz,  Julia
Emmy Noether Junior Research Group Forest Management in the Earth System, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37299

Raddatz,  Thomas
Global Vegetation Modelling, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

Fulltext (public)

bg-17-4173-2020.pdf
(Publisher version), 11MB

Supplementary Material (public)
There is no public supplementary material available
Citation

Arora, V. K., Katavouta, A., Williams, R. G., Jones, C. D., Brovkin, V., Friedlingstein, P., et al. (2020). Carbon-concentration and carbon-climate feedbacks in CMIP6 models and their comparison to CMIP5 models. Biogeosciences, 17, 4173-4222. doi:10.5194/bg-17-4173-2020.


Cite as: http://hdl.handle.net/21.11116/0000-0006-FEB0-5
Abstract
Results from the fully and biogeochemically coupled simulations in which CO2 increases at a rate of 1 % yr(-1) (1pctCO2) from its preindustrial value are analyzed to quantify the magnitude of carbon-concentration and carbon-climate feedback parameters which measure the response of ocean and terrestrial carbon pools to changes in atmospheric CO2 concentration and the resulting change in global climate, respectively. The results are based on 11 comprehensive Earth system models from the most recent sixth) Coupled Model Intercomparison Project (CMIP6) and compared with eight models from the fifth CMIP (CMIP5). The strength of the carbon-concentration feedback is of comparable magnitudes over land (mean +/- standard deviation = 0.97 +/- 0.40 PgC ppm(-1)) and ocean (0.79 +/- 0.07 PgC ppm(-1)), while the carbon-climate feedback over land (-45.1 +/- 50.6 PgC degrees C-1) is about 3 times larger than over ocean (-17.2 +/- 5.0 PgC degrees C-1). The strength of both feedbacks is an order of magnitude more uncertain over land than over ocean as has been seen in existing studies. These values and their spread from 11 CMIP6 models have not changed significantly compared to CMIP5 models. The absolute values of feedback parameters are lower for land with models that include a representation of nitrogen cycle. The transient climate response to cumulative emissions (TCRE) from the 11 CMIP6 models considered here is 1.77 +/- 0.37 degrees C EgC(-1) and is similar to that found in CMIP5 models (1.63 +/- 0.48 degrees C EgC(-1)) but with somewhat reduced model spread. The expressions for feedback parameters based on the fully and biogeochemically coupled configurations of the 1pctCO2 simulation are simplified when the small temperature change in the biogeochemically coupled simulation is ignored. Decomposition of the terms of these simplified expressions for the feedback parameters is used to gain insight into the reasons for differing responses among ocean and land carbon cycle models.