Effects of Parameterization of Latent Heating in a Tropical Prediction Model

Abstract

Diabatic experiments with a multi-level primitive equation model were performed using three latent heating parameterization schemes. The concept and method of application of the schemes is discussed, as well as physical interpretations. Initial experiments were made with a two-dimensional shearline case. Five-day forecasts show realistic simulation of convergence zones to the north and south of the shearline. Real data experiments in three dimensions were performed using data during the early stages of hurricane Betsy, 29 August 1965. Selected forecast fields are shown for each of the parameterization schemes, and compared to adiabatic prognoses. Heat and energy balances are shown for both two- and three-dimensional models.