The ICMC (IPSL Climate Modelling Center) continuously develops and improves the climate model and its various components. The IPSL CM5 is the last version of the IPSL model and is a full earth system model. In addition to the physical atmosphere-land-ocean-sea ice model, it also includes a representation of the carbon cycle, the stratospheric chemistry and the tropospheric chemistry with aerosols.
There are two versions of this model, with two different sets of physical models: the IPSL-CM5A is an extension of IPSL-CM4 whereas the IPSL-CM5B has an atmospheric model with very different physical parametrisations.
For the different versions of the IPSL-CM5 models that participate to the CMIP5 project, the atmospheric model has two standard resolutions: the low resolution is 1.9°x3.75° (96x96L39) and the mid-resolution is 1.25°x2.5° (143x144L39). For all of them, the resolution of the oceanic model is the same: about 2°, with a meridional increased resolution of 0.5° near the Equator (149x182L31).
IPSL climate models references
IPSL-CM5 is based on the following model components:
The LMDZ (in french) atmospheric model;
the NEMO ocean model, including sea ice and marine biogeochemistry;
the ORCHIDEE model of continental surfaces including carbon cycle;
the INCA model of chemistry and aerosols;
LMDz-REPROBUS (pdf) coupled chemistry-climate model.
All documentation is available here.