Climate Dynamics

, Volume 7, Issue 3, pp 133–139

Cloud-radiation feedbacks in a general circulation model and their dependence on cloud modelling assumptions

Authors

  • Zhao-Xin Li
    • Laboratoire de Météorologie Dynamique du CNRS 24
  • Hervé Le Treut
    • Laboratoire de Météorologie Dynamique du CNRS 24
Article

DOI: 10.1007/BF00211155

Cite this article as:
Li, Z. & Le Treut, H. Climate Dynamics (1992) 7: 133. doi:10.1007/BF00211155

Abstract

The general circulation model (GCM) used in this study includes a prognostic cloud scheme and a rather detailed radiation scheme. In a preceding paper, we showed that this model was more sensitive to a global perturbation of the sea surface temperatures than most other models with similar physical parametrization. The experiments presented here show how this feature might depend on some of the cloud modelling assumptions. We have changed the temperature at which the water clouds are allowed to become ice clouds and analyzed separately the feedbacks associated with the variations of cloud cover and cloud radiative properties. We show that the feedback effect associated with cloud radiative properties is positive in one case and negative in the other. This can be explained by the elementary cloud radiative forcing and has implications concerning the use of the GCMs for climate sensitivity studies.

Copyright information

© Springer-Verlag 1992