Abstract
Abstract As an extension of the work presented in an accompanying paper of Kao and Ogura, the Arakawa-Schubert cumulus parameterization scheme is examined prognostically in a modeling study of the evolution of a convectively driven tropical mesoscale rainband that developed on 12 August 1974 over the eastern Atlantic. A two-dimensional hydrostatic model is used with a mixed layer parameterization. Observed soundings were used as initial conditions and 24-h integrations of the model are made. In the control experiment, a prescribed time-independent large scale forcing is imposed in a limited area at low levels. Many aspects of the observed evolution of the rainband are well simulated by the model, including the shift of height of the area-averaged maximum upward motion from low levels to upper levels and the development of downward motion at low levels while upward motion of a significant magnitude is still present at upper levels. The predicted rainfall rate, in the mature stage, is also found to agree wi...
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