One-Way Nested Regional Climate Simulations and Domain Size

S. Vannitsem Institut Royal Météorologique de Belgique, Brussels, Belgium

Search for other papers by S. Vannitsem in
Current site
Google Scholar
PubMed
Close
and
F. Chomé Institut Royal Météorologique de Belgique, Brussels, Belgium

Search for other papers by F. Chomé in
Current site
Google Scholar
PubMed
Close
Restricted access

Abstract

The impact of domain size on regional climate simulations is explored in the context of a state-of-the-art regional model centered over western Europe. It is found that the quality of the climate simulations is highly dependent on the domain size. Moreover, the choice of an optimal version is more complex than usually thought, the less appropriate domain having an intermediate size (about 3000 km × 3000 km), and the best versions nearly cover a quarter of the Northern Hemisphere. The use of periodically reinitialized trajectories does improve the climate of suboptimal models but leads to unrealistic dynamical behaviors. The implications for regional climate simulations are briefly discussed.

Corresponding author address: Dr. S. Vannitsem, Institut Royal Météorologique de Belgique, Avenue Circulaire, 3, 1180 Brussels, Belgium. Email: svn@oma.be

Abstract

The impact of domain size on regional climate simulations is explored in the context of a state-of-the-art regional model centered over western Europe. It is found that the quality of the climate simulations is highly dependent on the domain size. Moreover, the choice of an optimal version is more complex than usually thought, the less appropriate domain having an intermediate size (about 3000 km × 3000 km), and the best versions nearly cover a quarter of the Northern Hemisphere. The use of periodically reinitialized trajectories does improve the climate of suboptimal models but leads to unrealistic dynamical behaviors. The implications for regional climate simulations are briefly discussed.

Corresponding author address: Dr. S. Vannitsem, Institut Royal Météorologique de Belgique, Avenue Circulaire, 3, 1180 Brussels, Belgium. Email: svn@oma.be

Save
  • Chomé, F., S. Vannitsem, and C. Nicolis, 1999: Dynamics, statistics and predictability of a simple limited-area model. Tellus, 51A , 222232.

    • Search Google Scholar
    • Export Citation
  • Chomé, F., S. Vannitsem, and C. Nicolis, 2002: Intrinsic dynamics of the regional Eta Model: Role of the domain size. Meteor. Z., 11 , 403408.

    • Search Google Scholar
    • Export Citation
  • Denis, B., R. Laprise, D. Caya, and J. Coté, 2002: Downscaling ability of one-way nested regional climate models: The big-brother experiment. Climate Dyn., 18 , 627646.

    • Search Google Scholar
    • Export Citation
  • Jones, R. G., J. M. Murphy, and M. Noguer, 1995: Simulation of climate change over Europe using a nested regional-climate model. I: Assessment of control climate, including sensitivity to location of the lateral boundaries. Quart. J. Roy. Meteor. Soc., 121 , 14131449.

    • Search Google Scholar
    • Export Citation
  • Mesinger, F., 2000: Numerical methods: The Arakawa approach, horizontal grid, global, and limited-area modeling. General Circulation Model Development, D. A. Randall, Ed., Academic Press, 373–419.

    • Search Google Scholar
    • Export Citation
  • Qian, J-H., A. Seth, and S. Zebiak, 2003: Reinitialized versus continuous simulations for regional climate downscaling. Mon. Wea. Rev., 131 , 28572874.

    • Search Google Scholar
    • Export Citation
  • Rogers, E., T. L. Black, D. G. Deaven, G. J. DiMego, Q. Zhao, M. Baldwin, N. W. Junker, and Y. Lin, 1996: Changes to the operational “early” eta analysis/forecast system at the National Centers for Environmental Prediction. Wea. Forecasting, 11 , 391413.

    • Search Google Scholar
    • Export Citation
  • Rojas, M., and A. Seth, 2003: Simulation and sensitivity in a nested modeling system for South America. Part II: GCM boundary forcing. J. Climate, 16 , 24542471.

    • Search Google Scholar
    • Export Citation
  • Seth, A., and F. Giorgi, 1998: The effects of domain choice on summer precipitation simulation and sensitivity in a regional climate model. J. Climate, 11 , 26982712.

    • Search Google Scholar
    • Export Citation
  • Seth, A., and M. Rojas, 2003: Simulation and sensitivity in a nested modeling system for South America. Part I: Reanalyses boundary forcing. J. Climate, 16 , 24372453.

    • Search Google Scholar
    • Export Citation
  • Xie, P., and P. A. Arkin, 1997: Global precipitation: A 17-year monthly analysis based on gauge observations, satellite estimates, and numerical model outputs. Bull. Amer. Meteor. Soc., 78 , 25392558.

    • Search Google Scholar
    • Export Citation
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 337 106 4
PDF Downloads 255 83 0