Dynamical Core Model Intercomparison Project (DCMIP)

DCMIP-PUMA-Simulation of the development of a baroclinic wave: Surface temperature (colours, °C), surface pressure (white isolines, hPa) at day 7.5. The red shadings highlight the regions with precipitation.

The international Project DCMIP addresses the dynamical core comparision of global atmospheric circulation models. For this purpose different experiments were prepared in which for the first time also moist processes (condensation and precipitation) and boundary layer dynamics are included. In the most ideal situation the results of the different models should coincide. However, since these models differ in their levels of approximation (e.g. hydrostatic versus nonhydrostatic approximation), in their governing equations (e.g. height-based versus pressure based vertical coordinates) and in their numerical solution technique (e.g. gridpoint versus spectral techniques), differences arise in the model results. Uncovering these differences is the aim of this project. The research group Dynamical Systems and the theoretical meteorology group contribute to the DCMIP project by performing the experiments with the spectral general circulation model PUMA.

 The following experiments were performed:

  • 3D deformational flow
  • 3D Hadley-like meridional circulation
  • 2D transport of thin cloud-like tracers in the presence of orography
  • Mountain waves over a Schaer-type mountain on a small planet without shear
  • Mountain waves over a Schaer-type mountain on a small planet with shear
  • Gravity wave on a small planet, along the equator
  • Dry baroclinic instability with dynamic tracers
  • Moist baroclinic instability (with large-scale condensation)
  • Moist baroclinic instability (with simplified physics forcing)
  • Idealized tropical cyclone (with simplified physics forcing)

 

The experiment results of the PUMA model are summarized in a Talk(pdf) which was presented at the DCMIP summer school on August 10, 2012.

Participating researchers: Thomas Frisius, Klaus Fraedrich, Hartmut Borth, Edilbert Kirk and Frank Lunkeit