CARACTERIZAÇÃO DE PERFIS DE VENTO NO AMBIENTE DE FORMAÇÃO DAS LINHAS DE INSTABILIDADE AMAZÔNICAS

Abstract

This research presents a profiles analysis of the zonal (u) and meridional (v) component of wind in a grid point near Belem city in Para State at 12 UTC for both days with squall lines (SL) formation and days without them. The aim is to inquire the dynamics technical features of the profiles that distinguish days with and without SL, such as wind vertical shear and medium and low level jets (LLJ) present in the formation environment of SL that may contribute for the development and intensity of these systems. The results showed that the zonal component profile of the winds on days with SL formation presents deeper and a little more intense LLJ in lower levels than on days without SL. The meridional component profile showed the presence of negative maximum about 900 hPa and a positive maximum close to 800 hPa and that there is a tendency for these maximum to be higher on days with SL. Therefore, the profiles behaviors show that there is an interaction of the LLJ in the formation and development of these systems, and the change in the wind direction in the meridional component seems to contribute for the formation of squall lines.