Acta Geophysica

, 59:1158 | Cite as

CAM-EULAG: A non-hydrostatic atmospheric climate model with grid stretching

  • Babatunde J. Abiodun
  • William J. Gutowski
  • Abayomi A. Abatan
  • Joseph M. Prusa


This study evaluates the capability of a non-hydrostatic global climate model with grid stretching (CEU) that uses NCAR Community Atmospheric Model (CAM) physics and EULAG dynamics. We compare CEU rainfall with that produced by CAM using finite volume dynamics (CFV). Both models simulated climate from 1996 to 2000, using the same parameterization schemes.

CEU and CFV both simulate well the observed global rainfall pattern. However, with same grid, CEU performs better than CFV in simulating the annual cycles of precipitation over our target region of West Africa. The reason is that it simulates African easterly jet and monsoon circulations better than CFV. CEU simulations with horizontal grid stretching to 0.5° are markedly better than those using CAM’s standard 2.0°×2.5° grid.

Key words

global climate model stretched grid non-hydrostatic dynamics 


  1. Abiodun, B.J., J.M. Prusa, and W.J. Gutowski (2008), Implementation of a nonhydrostatic, adaptive-grid dynamic core in CAM3. Part I: comparison of dynamics cores in aqua-planet simulations, Clim. Dyn. 31,7–8, 795–810, DOI: 10.1007/s00382-008-0381-y.CrossRefGoogle Scholar
  2. Andrejczuk, M., W.W. Grabowski, S.P. Malinowski, and P.K. Smolarkiewicz (2004), Numerical simulation of cloud-clear air interfacial mixing, J. Atmos. Sci. 61,14, 1726–1739, DOI: 10.1175/1520-0469(2004)061<1726:NSOCAI>2.0.CO;2.CrossRefGoogle Scholar
  3. Berrisford, P., D. Dee, K. Fielding, M. Fuentes, P. Kallberg, S. Kobayashi, and S. Uppala (2009), The ERA-Interim archive, ERA Report Series, 1, European Centre for Medium-Range Weather Forecasts, Shinfield Park, Reading, 16 pp.Google Scholar
  4. Collins, W.D., P.J. Rasch, B.A. Boville, J.J. Hack, J.R. McCaa, D.L. Williamson, J.T. Kiehl, B. Briegleb, C. Bitz, S.-J. Lin, M. Zhang, and Y. Dai (2004), Description of the NCAR community atmosphere model (CAM 3.0), Technical report NCAR/TN-464+STR, National Center for Atmospheric Research, Boulder, CO, 210 pp.Google Scholar
  5. Collins, W.D., P.J. Rasch, B.A. Boville, J.J. Hack, J.R. McCaa, D.L. Williamson, B.P. Briegleb, C.M. Bitz, S.-J. Lin, and M. Zhang (2006), The formulation and atmospheric simulation of the community atmosphere model Version 3 (CAM3), J. Climate 19,11, 2144–2161, DOI: 10.1175/JCLI3760.1.CrossRefGoogle Scholar
  6. Durran, D.R. (2008), A physically motivated approach for filtering acoustic waves from the equations governing compressible stratified flow, J. Fluid Mech. 601, 365–379, DOI: 10.1017/S0022112008000608.CrossRefGoogle Scholar
  7. Elliott, J.R., and P.K. Smolarkiewicz (2002), Eddy resolving simulations of turbulent solar convection, Int. J. Numer. Meth. Fluids 39,9, 855–864, DOI: 10.1002/fld.333.CrossRefGoogle Scholar
  8. Huffman, G.J., R.F. Adler, M.M. Morrissey, D.T. Bolvin, S. Curtis, R. Joyce, B. Mc-Gavock, and J. Susskind (2001), Global precipitation at One-Degree Daily resolution from multisatellite observations, J. Hydrometeor. 2,1, 36–50, DOI: 10.1175/1525-7541(2001)002<0036:GPAODD>2.0.CO;2.CrossRefGoogle Scholar
  9. Jenkins, G.S., A.T. Gaye, and B. Sylla (2005), Late 20th century attribution of drying trends in the Sahel from the Regional Climate Model (RegCM3), Geophys. Res. Lett. 32, L22705, DOI: 10.1029/2005GL024225.CrossRefGoogle Scholar
  10. Le Barbé, L., T. Lebel, and D. Tapsoba (2002), Rainfall variability in West Africa during the years 1950–1990, J. Climate 15,2, 187–202, DOI: 10.1175/1520-0442(2002)015<0187:RVIWAD>2.0.CO;2.CrossRefGoogle Scholar
  11. Mitchell, T.D., and P.D. Jones (2005), An improved method of constructing a database of monthly climate observations and associated high-resolution grids, Int. J. Climatol. 25,6, 693–712, DOI: 10.1002/joc.1181.CrossRefGoogle Scholar
  12. Nicholson, S.E. (2009), On the factors modulating the intensity of the tropical rainbelt over West Africa, Int. J. Climatol. 29,5, 673–689, DOI: 10.1002/joc.1702.CrossRefGoogle Scholar
  13. Omotosho, J.B., and B.J. Abiodun (2007), A numerical study of moisture buildup and rainfall over West Africa, Meteorol. Appl. 14,3, 209–225, DOI: 10.1002/met.11.CrossRefGoogle Scholar
  14. Prusa, J.M., and W.J. Gutowski (2006), MPDATA and grid adaptivity in geophysical fluid flow models, Int. J. Num. Meth. Fluids 50,10, 1207–1228, DOI: 10.1002/fld.1152.CrossRefGoogle Scholar
  15. Prusa, J.M., P.K. Smolarkiewicz, and A.A. Wyszogrodzki (2008), EULAG, a computational model for multi-scale flows, Comput. Fluids 37,9, 1193–1207, DOI: 10.1016/j.compfluid.2007.12.001.CrossRefGoogle Scholar
  16. Simpson, J., C. Kummerow, W.-K. Tao, and R.F. Adler (1996), On the Tropical Rainfall Mission (TRMM), Meteorol. Atmos. Phys. 60,1–3, 19–36, DOI: 10.1007/BF01029783.CrossRefGoogle Scholar
  17. Smolarkiewicz, P.K., and A. Dörnbrack (2008), Conservative integrals of adiabatic Durran’s equations, Int. J. Num. Meth. Fluids 56,8, 1513–1519, DOI: 10.1002/fld.160.CrossRefGoogle Scholar
  18. Sylla, M.B., A. Dell’Aquila, P.M. Ruti, and F. Giorgi (2010a), Simulation of the intraseasonal and the interannual variability of rainfall over West Africa with RegCM3 during the monsoon period, Int. J. Climatol. 30,12, 1865–1883, DOI: 10.1002/joc.2029.Google Scholar
  19. Sylla, M.B., A.T. Gaye, G.S. Jenkins, J.S. Pal, and F. Giorgi (2010b), Consistency of projected drought over the Sahel with changes in the monsoon circulation and extremes in a regional climate model projections, J. Geophys. Res. 115, D16108, DOI: 10.1029/2009JD012983.CrossRefGoogle Scholar

Copyright information

© © Versita Warsaw and Springer-Verlag Wien 2011

Authors and Affiliations

  • Babatunde J. Abiodun
    • 1
  • William J. Gutowski
    • 2
  • Abayomi A. Abatan
    • 2
  • Joseph M. Prusa
    • 3
  1. 1.Department of Environmental and Geographical SciencesUniversity of Cape TownCape TownSouth Africa
  2. 2.Department of Geological and Atmospheric SciencesIowa State UniversityAmesUSA
  3. 3.Teraflux CorporationBoca RatonUSA

Personalised recommendations