Climate Dynamics

, Volume 35, Issue 5, pp 875–886 | Cite as

Response to the eruption of Mount Pinatubo in relation to climate sensitivity in the CMIP3 models

  • Frida A.-M. BenderEmail author
  • Annica M. L. Ekman
  • Henning Rodhe


The radiative flux perturbations and subsequent temperature responses in relation to the eruption of Mount Pinatubo in 1991 are studied in the ten general circulation models incorporated in the Coupled Model Intercomparison Project, phase 3 (CMIP3), that include a parameterization of volcanic aerosol. Models and observations show decreases in global mean temperature of up to 0.5 K, in response to radiative perturbations of up to 10 W m−2, averaged over the tropics. The time scale representing the delay between radiative perturbation and temperature response is determined by the slow ocean response, and is estimated to be centered around 4 months in the models. Although the magniude of the temperature response to a volcanic eruption has previously been used as an indicator of equilibrium climate sensitivity in models, we find these two quantities to be only weakly correlated. This may partly be due to the fact that the size of the volcano-induced radiative perturbation varies among the models. It is found that the magnitude of the modelled radiative perturbation increases with decreasing climate sensitivity, with the exception of one outlying model. Therefore, we scale the temperature perturbation by the radiative perturbation in each model, and use the ratio between the integrated temperature perturbation and the integrated radiative perturbation as a measure of sensitivity to volcanic forcing. This ratio is found to be well correlated with the model climate sensitivity, more sensitive models having a larger ratio. Further, if this correspondence between “volcanic sensitivity” and sensitivity to CO2 forcing is a feature not only among the models, but also of the real climate system, the alleged linear relation can be used to estimate the real climate sensitivity. The observational value of the ratio signifying volcanic sensitivity is hereby estimated to correspond to an equilibrium climate sensitivity, i.e. equilibrium temperature increase due to a doubling of the CO2 concentration, between 1.7 and 4.1 K. Several sources of uncertainty reside in the method applied, and it is pointed out that additional model output, related to ocean heat storage and radiative forcing, could refine the analysis, as could reduced uncertainty in the observational record, of temperature as well as forcing.


Volcanic eruption GCM Climate sensitivity 



The authors belong to the Bert Bolin Centre for Climate Research. We acknowledge the modeling groups, the Program for Climate Model Diagnosis and Intercomparison (PCMDI) and the World Climate Research Programme’s (WCRP’s) Working Group on Coupled Modelling (WGCM) for their roles in making available the WCRP CMIP3 multi-model dataset. Support of this dataset is provided by the Office of Science, US Department of Energy. We also acknowledge the ECMWF for providing the ERA-40 data through their data server and the NASA Langley Research Center Atmospheric Science Data Center for providing the ERBE data. We thank Lennart Bengtsson, Erland Källén, Johan Nilsson and Johannes Karlsson for valuable discussion.


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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Frida A.-M. Bender
    • 1
    Email author
  • Annica M. L. Ekman
    • 1
  • Henning Rodhe
    • 1
  1. 1.Department of MeteorologyStockholm UniversityStockholmSweden

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