A SPECTRAL MODEL FOR SIMULATION OF TIDES IN THE MIDDLE ATMOSPHERE .2.RESULTS FOR THE DIURNAL TIDE

We present calculations of the diurnal tide in the middle atmosphere m ade using the spectral tidal model described in Wood and Andrews (1996 a). The results are partly verified by comparisons with those from a ' classical' model for the case where background winds are absent. Calcu lations including the effects of background winds are compared with pr evious models and with observations. The convergence of the numerical algorithms is checked by a number of sensitivity Studies. A method of dealing with certain singular matrices that appear in the computation is described, as are experiments in which the tidal heating rates and the zonal-mean wind fields are adjusted. Copyright (C) 1996 Elsevier S cience Ltd.