Publication Abstracts

Collins et al. 2006

Collins, W.D., V. Ramaswamy, M.D. Schwarzkopf, Y. Sun, R.W. Portmann, Q. Fu, S.E.B. Casanova, J.-L. Dufresne, D.W. Fillmore, P.M.D. Forster, V.Y. Galin, L.K. Gohar, W.J. Ingram, D.P. Kratz, M.-P. Lefebvre, J. Li, P. Marquet, V. Oinas, Y. Tsushima, T. Uchiyama, and W.Y. Zhong, 2006: Radiative forcing by well-mixed greenhouse gases: Estimates from climate models in the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4). J. Geophys. Res., 111, D14317, doi:10.1029/2005JD006713.

The radiative effects from increased concentrations of well-mixed greenhouse gases (WMGHGs) represent the most significant and best understood anthropogenic forcing of the climate system. The most comprehensive tools for simulating past and future climates influenced by WMGHGs are fully coupled atmosphere-ocean general circulation models (AOGCMs). Because of the importance of WMGHGs as forcing agents it is essential that AOGCMs compute the radiative forcing by these gases as accurately as possible. We present the results of a radiative transfer model intercomparison between the forcings computed by the radiative parameterizations of AOGCMs and by benchmark line-by-line (LBL) codes. The comparison is focused on forcing by CO2, CH4, N2O, CFC-11, CFC-12, and the increased H2O expected in warmer climates. The models included in the intercomparison include several LBL codes and most of the global models submitted to the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4). In general, the LBL models are in excellent agreement with each other. However, in many cases, there are substantial discrepancies among the AOGCMs and between the AOGCMs and LBL codes. In some cases this is because the AOGCMs neglect particular absorbers, in particular the near-infrared effects of CH4 and N2O, while in others it is due to the methods for modeling the radiative processes. The biases in the AOGCM forcings are generally largest at the surface level. We quantify these differences and discuss the implications for interpreting variations in forcing and response across the multimodel ensemble of AOGCM simulations assembled for the IPCC AR4.

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BibTeX Citation

@article{co07100z,
  author={Collins, W. D. and Ramaswamy, V. and Schwarzkopf, M. D. and Sun, Y. and Portmann, R. W. and Fu, Q. and Casanova, S. E. B. and Dufresne, J.-L. and Fillmore, D. W. and Forster, P. M. D. and Galin, V. Y. and Gohar, L. K. and Ingram, W. J. and Kratz, D. P. and Lefebvre, M.-P. and Li, J. and Marquet, P. and Oinas, V. and Tsushima, Y. and Uchiyama, T. and Zhong, W. Y.},
  title={Radiative forcing by well-mixed greenhouse gases: Estimates from climate models in the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4)},
  year={2006},
  journal={J. Geophys. Res.},
  volume={111},
  pages={D14317},
  doi={10.1029/2005JD006713},
}

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RIS Citation

TY  - JOUR
ID  - co07100z
AU  - Collins, W. D.
AU  - Ramaswamy, V.
AU  - Schwarzkopf, M. D.
AU  - Sun, Y.
AU  - Portmann, R. W.
AU  - Fu, Q.
AU  - Casanova, S. E. B.
AU  - Dufresne, J.-L.
AU  - Fillmore, D. W.
AU  - Forster, P. M. D.
AU  - Galin, V. Y.
AU  - Gohar, L. K.
AU  - Ingram, W. J.
AU  - Kratz, D. P.
AU  - Lefebvre, M.-P.
AU  - Li, J.
AU  - Marquet, P.
AU  - Oinas, V.
AU  - Tsushima, Y.
AU  - Uchiyama, T.
AU  - Zhong, W. Y.
PY  - 2006
TI  - Radiative forcing by well-mixed greenhouse gases: Estimates from climate models in the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4)
JA  - J. Geophys. Res.
VL  - 111
SP  - D14317
DO  - 10.1029/2005JD006713
ER  -

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