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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Volume 4, issue 1
Geosci. Model Dev., 4, 69–83, 2011
https://doi.org/10.5194/gmd-4-69-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Geosci. Model Dev., 4, 69–83, 2011
https://doi.org/10.5194/gmd-4-69-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Model description paper 02 Feb 2011

Model description paper | 02 Feb 2011

Evaluation of a present-day climate simulation with a new coupled atmosphere-ocean model GENMOM

J. R. Alder1, S. W. Hostetler2, D. Pollard3, and A. Schmittner4 J. R. Alder et al.
  • 1Oregon State University, Department of Geosciences, Corvallis, OR 97331, USA
  • 2US Geological Survey, Oregon State University, Department of Geosciences, Corvallis, OR 97331, USA
  • 3Pennsylvania State University, EMS Earth and Environmental Systems, University Park, PA 16802, USA
  • 4Oregon State University, College of Ocean and Atmospheric Sciences, Corvallis, OR 97331, USA

Abstract. We present a new, non-flux corrected AOGCM, GENMOM, that combines the GENESIS version 3 atmospheric GCM (Global Environmental and Ecological Simulation of Interactive Systems) and MOM2 (Modular Ocean Model version 2) nominally at T31 resolution. We evaluate GENMOM by comparison with reanalysis products (e.g., NCEP2) and three models used in the IPCC AR4 assessment. GENMOM produces a global temperature bias of 0.6 °C. Atmospheric features such as the jet stream structure and major semi-permanent sea level pressure centers are well simulated as is the mean planetary-scale wind structure that is needed to produce the correct position of stormtracks. Most ocean surface currents are reproduced except where they are not resolvable at T31 resolution. Overall, GENMOM captures reasonably well the observed gradients and spatial distributions of annual surface temperature and precipitation and the simulations are on par with other AOGCMs. Deficiencies in the GENMOM simulations include a warm bias in the surface temperature over the southern oceans, a split in the ITCZ and weaker-than-observed overturning circulation.

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