07 Feb 2023
 | 07 Feb 2023
Status: this preprint is open for discussion.

The Canadian Atmospheric Model version 5 (CanAM5.0.3)

Jason Neil Steven Cole, Knut von Salzen, Jiangnan Li, John Scinocca, David Plummer, Vivek Arora, Norman McFarlane, Michael Lazare, Murray MacKay, Diana Verseghy, and Barbara Winter

Abstract. The Canadian Atmospheric Model version 5 (CanAM5) is the component of Canadian Earth System Model version 5 (CanESM5) which models atmospheric processes and coupling of the atmosphere with land and lake models. Described in this paper are the main features of CanAM5, with a focus on changes relative to the last major scientific version of the model (CanAM4). These changes are mostly related to improvements in radiative transfer, clouds and aerosol parameterizations, as well as a major upgrade of the land surface and land carbon cycle models and addition of a small lake model. In addition to changes to parameterizations and models, changes in the adjustable parameters between CanAM4 and CanAM5 are documented. Finally, the mean climatology simulated by CanAM5 for present day are evaluated against observations and compared with that simulated by CanAM4. Although many of the aspects of the simulated climate are similar between CanAM4 and CanAM5, there is a reduction of precipitation and temperature biases over the Amazonian basin, global cloud fraction biases, and solar and thermal cloud radiative effects, all of which are improvements relative to observations.

Jason Neil Steven Cole et al.

Status: open (until 04 Apr 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-120', Anonymous Referee #1, 24 Mar 2023 reply
  • RC2: 'Comment on egusphere-2023-120', Anonymous Referee #2, 27 Mar 2023 reply

Jason Neil Steven Cole et al.

Jason Neil Steven Cole et al.


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Short summary
The Canadian Atmospheric Model version 5 (CanAM5) is used to simulate, on a global scale, climate of Earth's atmosphere, land and lakes. We document changes to the physics in CanAM5 since the last major version of the model (CanAM4) and evaluate the climate simulated relative to observations and CanAM4. The climate simulated by CanAM5 is similar to CanAM4 but there are improvements, including better simulation of temperature and precipitation over the Amazon and better simulation of clouds.