PARAMETRIZATION OF THE PRECIPITATION IN THE NORTHERN-HEMISPHERE AND ITS VERIFICATION IN MEXICO

To improve results in monthly rainfall prediction, a parametrization o f precipitation has been developed. The thermodynamic energy equation used in the Adem thermodynamic model (ATM) and the Clausius and Clapey ron equation, were used to obtain a linear parametrization of the prec ipitation anomalies as a function of the surface temperature and the 7 00 mb temperature anomalies. The observed rainfall in Mexico over 36 m onths, from January 1981 to December 1983, was compared with the resul ts obtained of the heat released by condensation, which is proportiona l to precipitation, using our theoretical formula, and those obtained using a statistical formula, which was derived for the ATM using 12 ye ars of hemispheric real data. The verification using our formula in Me xico, showed better results than the one using the statistical formula .