Climate Dynamics

, Volume 31, Issue 7, pp 927–940

Investigation of regional climate models’ internal variability with a ten-member ensemble of 10-year simulations over a large domain

  • Philippe Lucas-Picher
  • Daniel Caya
  • Ramón de Elía
  • René Laprise
Article

DOI: 10.1007/s00382-008-0384-8

Cite this article as:
Lucas-Picher, P., Caya, D., de Elía, R. et al. Clim Dyn (2008) 31: 927. doi:10.1007/s00382-008-0384-8

Abstract

Previous investigations on regional climate models’ (RCM) internal variability (IV) were limited owing to small ensembles, short simulations and small domains. The present work extends previous studies with a ten-member ensemble of 10-year simulations performed with the Canadian Regional Climate Model over a large domain covering North America. The results show that the IV has no long-term tendency but rather fluctuates in time following the synoptic situation within the domain. The IV of mean-sea-level pressure (MSLP) and screen temperature (ST) show a small annual cycle with larger values in spring, which differs from previous studies. For precipitation (PCP), the IV shows a clear annual cycle with larger values in summer, as previously reported. The 10-year climatology of the IV for MSLP and ST shows a well-defined spatial distribution with larger values in the northeast of the domain, near the outflow boundary. A comparison of the IV of MSLP and ST in summer with the transient-eddy variance reveals that the IV is close to its maximum in a small region near the outflow boundary. Same analysis for PCP in summer shows that the IV reaches its maximum in most parts of the domain, except for a small region on the western side near the inflow boundary. Finally, a comparison of the 10-year climate of each simulation of the ensemble showed that the IV may have a significant impact on the climatology of some variables.

Keywords

Internal variability Regional climate models Ensemble of simulations North American climate Ten-year simulations 

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Philippe Lucas-Picher
    • 1
    • 2
  • Daniel Caya
    • 2
    • 3
  • Ramón de Elía
    • 2
    • 3
  • René Laprise
    • 2
  1. 1.Danish Meteorological InstituteCopenhagen EDenmark
  2. 2.Canadian Network for Regional Climate Modelling and Diagnostics, UQÀMMontrealCanada
  3. 3.Ouranos ConsortiumMontrealCanada

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