Simulation study o fthe initial stage ofthe origin o fcyclonic and anticyclonicpairs in the intratropical convergence zone Longituge, deg 30 25 20 15 10 Ш 5 Ш 0 25 20 15 10 5 0 Fig. 1. The distributions of horizontal Fig. 2. The same as in Fig. 1, but obtained for the component of the air velocity (m/s) at the second initial configuration of the intratropical altitude of 600 m, assigned at the initial convergence zone. moment (top panel), computed 12 hours after the beginning of calculations (middle panel), and computed 27 hours after the beginning of calculations (bottom panel). The results are obtained for the first initial configuration of the intratropical convergence zone. emitted owing to phase transitions of water vapor to micro drops of water and ice particles due to the upward motion of air, into kinetic energy of the air flow. Conclusions A regional mathematical model of the neutral wind system of the lower atmosphere, developed recently in the Polar Geophysical Institute, was utilized to investigate the initial stage of the origin of cyclonic and anticyclonic vortexes at tropical latitudes of the northern hemisphere. The model produces three-dimensional distributions of the atmospheric parameters in the height range from 0 to 15 km over a limited region of the Earth's surface. The dimensions of the simulation domain in longitudinal and latitudinal directions are 32° and 25°, respectively. Calculations were performed for the cases when the simulation domain is intersected by the intratropical convergence zones with different configurations. Calculations were made for various cases in which the initial forms 191 00u -a < l T 00 3 00 10 0 5 10 15 20 25 30 Longitude, deg

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