Evaluation of a present-day climate simulation with a new coupled atmosphere-ocean model GENMOM 1Oregon State University, Department of Geosciences, Corvallis, OR 97331, USA
Model Description Paper
02 Feb 2011
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
Received: 22 September 2010 – Published in Geosci. Model Dev. Discuss.: 15 October 2010 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.
Revised: 20 January 2011 – Accepted: 21 January 2011 – Published: 02 February 2011
Citation: Alder, J. R., Hostetler, S. W., Pollard, D., and Schmittner, A.: Evaluation of a present-day climate simulation with a new coupled atmosphere-ocean model GENMOM, Geosci. Model Dev., 4, 69-83, doi:10.5194/gmd-4-69-2011, 2011.