Impact of the LMDZ atmospheric grid configuration on the climate and sensitivity of the IPSL-CM5A coupled model View Full Text


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Article Info

DATE

2012-07-26

AUTHORS

Frédéric Hourdin, Marie-Alice Foujols, Francis Codron, Virginie Guemas, Jean-Louis Dufresne, Sandrine Bony, Sébastien Denvil, Lionel Guez, François Lott, Josefine Ghattas, Pascale Braconnot, Olivier Marti, Yann Meurdesoif, Laurent Bopp

ABSTRACT

The IPSL-CM5A climate model was used to perform a large number of control, historical and climate change simulations in the frame of CMIP5. The refined horizontal and vertical grid of the atmospheric component, LMDZ, constitutes a major difference compared to the previous IPSL-CM4 version used for CMIP3. From imposed-SST (Sea Surface Temperature) and coupled numerical experiments, we systematically analyze the impact of the horizontal and vertical grid resolution on the simulated climate. The refinement of the horizontal grid results in a systematic reduction of major biases in the mean tropospheric structures and SST. The mid-latitude jets, located too close to the equator with the coarsest grids, move poleward. This robust feature, is accompanied by a drying at mid-latitudes and a reduction of cold biases in mid-latitudes relative to the equator. The model was also extended to the stratosphere by increasing the number of layers on the vertical from 19 to 39 (15 in the stratosphere) and adding relevant parameterizations. The 39-layer version captures the dominant modes of the stratospheric variability and exhibits stratospheric sudden warmings. Changing either the vertical or horizontal resolution modifies the global energy balance in imposed-SST simulations by typically several W/m2 which translates in the coupled atmosphere-ocean simulations into a different global-mean SST. The sensitivity is of about 1.2 K per 1 W/m2 when varying the horizontal grid. A re-tuning of model parameters was thus required to restore this energy balance in the imposed-SST simulations and reduce the biases in the simulated mean surface temperature and, to some extent, latitudinal SST variations in the coupled experiments for the modern climate. The tuning hardly compensates, however, for robust biases of the coupled model. Despite the wide range of grid configurations explored and their significant impact on the present-day climate, the climate sensitivity remains essentially unchanged. More... »

PAGES

2167-2192

References to SciGraph publications

  • 2005-10-14. The stratospheric version of LMDz: dynamical climatologies, arctic oscillation, and impact on the surface climate in CLIMATE DYNAMICS
  • 2012-01-15. Interpretation of the positive low-cloud feedback predicted by a climate model under global warming in CLIMATE DYNAMICS
  • 2012-04-28. LMDZ5B: the atmospheric component of the IPSL climate model with revisited parameterizations for clouds and convection in CLIMATE DYNAMICS
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  • 2009-08-13. Key features of the IPSL ocean atmosphere model and its sensitivity to atmospheric resolution in CLIMATE DYNAMICS
  • 2004-05-29. Impact of horizontal resolution on the simulation of the Asian summer monsoon and tropical cyclones in the JMA global model in CLIMATE DYNAMICS
  • 2004-01. High-latitude controls of thermocline nutrients and low latitude biological productivity in NATURE
  • 2004-01-27. On dynamic and thermodynamic components of cloud changes in CLIMATE DYNAMICS
  • 2006-08-08. The LMDZ4 general circulation model: climate performance and sensitivity to parametrized physics with emphasis on tropical convection in CLIMATE DYNAMICS
  • 2006-07-18. The impact of global freshwater forcing on the thermohaline circulation: adjustment of North Atlantic convection sites in a CGCM in CLIMATE DYNAMICS
  • 1979-09. A parametric model of vertical eddy fluxes in the atmosphere in BOUNDARY-LAYER METEOROLOGY
  • 1995-09. Climate sensitivity of the NCAR Community Climate Model (CCM2) to horizontal resolution in CLIMATE DYNAMICS
  • 2007-04-11. Impact of different convective cloud schemes on the simulation of the tropical seasonal cycle in a coupled ocean–atmosphere model in CLIMATE DYNAMICS
  • 1989-12. Observational determination of the greenhouse effect in NATURE
  • 2007-10-16. Sensitivity of simulated wintertime Arctic atmosphere to vertical resolution in the ARPEGE/IFS model in CLIMATE DYNAMICS
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    http://scigraph.springernature.com/pub.10.1007/s00382-012-1411-3

    DOI

    http://dx.doi.org/10.1007/s00382-012-1411-3

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