2.1 Atmospheric General Circulation Models

 

Stefano Materia, CMCC The Euro-Mediterranean Center on Climate Change

 

OUTLINE
  • A brief introduction on General Circulation Models;  General circulation models of the atmosphere are resolved by complicated equations that need to be discretized in order to find a solution.
  • Horizontal resolution plays an important role for a correct simulation of climate processes, a better representation of orography.
  • Two different approaches: AMIP-type (ocean is a boundary condition) and  fully coupled type (ocean and atmosphere interact every time step)
  • Despite systematic biases, models are able to reproduce the past climate,  when the anthropogenic forcing is introduced. It’s likely that future climate is also well projected.
  • The far target of climate projections makes the impact of initialization neglectable: instead, boundary conditions have a crucial role for the representation of future climate. A realistic state initial state representation is needed for climate predictions
M2_2.1_Atmospheric-General-Circulation-Models
Atmospheric General Circulation Models: methodology, results, biases
Stefano Materia, Centro Euro-Mediterraneo sui Cambiamenti Climatici CMCC

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