Abstract
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.
Highlights
We present a new non-flux corrected coupled atmosphereocean general circulation model (AOGCM), GENMOM, which combines GENESIS version 3 (Global ENvironmental and Ecological Simulation of Interactive Systems) and MOM2 (Modular Ocean Model version 2) general circulation models
We evaluate a simulation of modern climate using observational and reanalysis data and we compare GENMOM surface temperature and precipitation with three other AOGCMs evaluated in the World Climate Research Programme (WCRP) Coupled Model Intercomparison Project phase 3 (CMIP3, Meehl et al, 2007a), a multi-model dataset that was subsequently used in the IPCC AR4
We present the first formal evaluation of the new AOGCM GENMOM, a non-flux corrected model comprised of GENESIS 3 atmospheric model, the MOM2 ocean model and LSX land-surface model
Summary
We present a new non-flux corrected coupled atmosphereocean general circulation model (AOGCM), GENMOM, which combines GENESIS version 3 (Global ENvironmental and Ecological Simulation of Interactive Systems) and MOM2 (Modular Ocean Model version 2) general circulation models. Both models have been used widely in climate studies that demonstrate their overall ability to produce climate simulations that are in agreement both with obser-. GENESIS version 1 was released in 1991 (Thompson and Pollard, 1995) and included a land-surface transfer model (LSX) and an atmospheric general circulation model derived from NCAR CCM1.
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