Subgrid parameterisations for primitive equation atmospheric models

Authors

  • Jorgen Segerlund Frederiksen CSIRO Oceans and Atmosphere
  • Martin Dix CSIRO Oceans and Atmosphere
  • Stacey Osbrough CSIRO Oceans and Atmosphere
  • Vassili Kitsios CSIRO Oceans and Atmosphere

DOI:

https://doi.org/10.21914/anziamj.v56i0.9358

Keywords:

Subgrid modelling, climate models, large-eddy simulations

Abstract

Dynamical and thermodynamical subgrid-scale parameterisations of eddy drain, net dissipation and stochastic backscatter are calculated for a multi-level primitive equation atmospheric general circulation model. The parameterisations have only moderate variability with height and a cusp behaviour with peaks near the largest retained wavenumber. Vertically integrated net dissipation functions for vorticity and temperature are very similar to corresponding results for barotropic simulations while the divergence dissipation is nearly four times stronger. Atmospheric general circulation model simulations with the new subgrid model improve kinetic energy spectra and zonal flows compared with control simulations. References

Author Biographies

Jorgen Segerlund Frederiksen, CSIRO Oceans and Atmosphere

CSIRO Fellow and Fellow of Australian Academy of Science

Martin Dix, CSIRO Oceans and Atmosphere

Principal Research Scientist

Stacey Osbrough, CSIRO Oceans and Atmosphere

Research Project Officer

Vassili Kitsios, CSIRO Oceans and Atmosphere

Post Doctoral Fellow

Published

2015-11-09

Issue

Section

Proceedings Computational Techniques and Applications Conference