THE CLIMATOLOGY OF EXPLOSIVE CYCLOGENESIS IN 2 GENERAL-CIRCULATION MODELS

The occurence of explosive cyclogenesis is studied in two 180-day cold -season simulations by the Community Climate Models (CCM1 and CCM2) de veloped at the National Center for Atmospheric Research. The CCM1 run mas realistic in some respects but produced relatively few cases over the North Atlantic Ocean and failed to show concentration just off the east coasts of the continents and north of the warm ocean currents. T he intensity of cyclogenesis was underestimated in the CCM1 run. All o f these flaws were mended in the CCM2 run, in which the climatology of explosive cyclogenesis closely resembled that in the real atmosphere.