The structure and evolution of extratropical cyclones, fronts, jet streams, and the tropopause in the GEOS general circulation model

The realism of extratropical cyclones, fronts, jet streams. and the tropopa use in the Goddard Earth Observing System (GEOS) general circulation model (GCM), implemented in assimilation and simulation modes, is evaluated from climatological and case-study perspectives using the GEOS-1 reanalysis clim atology and applicable conceptual models as benchmarks for comparison. The latitude-longitude grid spacing of the datasets derived from the GEOS GCM r anges from 2 degrees x 2.5 degrees to 0.5 degrees x 0.5 degrees. Frontal sy stems in the higher-resolution datasets are characterized by horizontal pot ential temperature gradients that are narrower in scale and larger in magni tude than their lower-resolution counterparts, and various structural featu res in the Shapiro-Keyser cyclone model are replicated with reasonable fide lity at 1 degrees x 1 degrees resolution. The remainder of the evaluation f ocuses on a 3-month Northern Hemisphere winter simulation of the GEOS GCM a t 1 degrees x 1 degrees resolution. The simulation realistically reproduces various large-scale circulation features related to the North Pacific and Atlantic jet streams when compared with the GEOS-1 reanalysis climatology, and conforms closely to a conceptualization of the zonally averaged troposp here and stratosphere proposed originally by Napier Shaw and revised by Hos kins. An extratropical cyclone that developed over the North Atlantic Ocean in the simulation features surface and tropopause evolutions corresponding to the Norwegian cyclone model and to the LC2 life cycle proposed by Thorn croft et al., respectively. These evolutions are related to the position of the developing cyclone with respect to upper-level jets identified in the time-mean and instantaneous flow fields. This article concludes with the en umeration of several research opportunities that may be addressed through t he use of state-of-the-art GCMs possessing sufficient resolution to represe nt mesoscale phenomena and processes explicitly.