Article

Climate Dynamics

, Volume 16, Issue 2, pp 123-146

The impact of new physical parametrizations in the Hadley Centre climate model: HadAM3

  • V. D. PopeAffiliated withHadley Centre for Climate Prediction and Research, Meteorological Office, London Rd., Bracknell, Berks, UK E-mail: vdpope@meto.gov.uk
  • , M. L. GallaniAffiliated withHadley Centre for Climate Prediction and Research, Meteorological Office, London Rd., Bracknell, Berks, UK E-mail: vdpope@meto.gov.uk
  • , P. R. RowntreeAffiliated withHadley Centre for Climate Prediction and Research, Meteorological Office, London Rd., Bracknell, Berks, UK E-mail: vdpope@meto.gov.uk
  • , R. A. StrattonAffiliated withHadley Centre for Climate Prediction and Research, Meteorological Office, London Rd., Bracknell, Berks, UK E-mail: vdpope@meto.gov.uk

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Abstract

 Results are presented from the latest version of the Hadley Centre climate model, HadAM3 (Hadley Centre Atmospheric Model version 3). It represents a significant improvement over the previous version, HadAM2b. This is demonstrated using a series of ten year integrations with AMIP (Atmospheric Model Intercomparison Project) boundary conditions. The work covers three aspects of model performance: (1) it shows the improvements in the mean climate in changing from HadAM2b to HadAM3; (2) it demonstrates that the model now compares well with observations and (3) it isolates the impacts of new physical parametrizations.