Estudo de uma situação convectiva (iniciação dissipação) utilizando dados do radar meteorológico Doppler de Manaus

Abstract

Mesoscale convective systems (SCM) systems are characteristic of the Amazon region. This region has factors to easy the formation of convective activity, i.e. high values of temperature and humidity of air. These systems usually cause strong winds, electrical atmospheric discharges and occasionally, hail, and high amounts of precipitation. The interest of various public and private companies as well as society in general, generates a great demand to track and predict severe storms in real time with precision. The aim of this work is to study the formation, properties, dynamic characteristics, structure and temporal evolution (growth, maturity and dissipation) of convective clouds of large vertical development and its association the structure of precipitation over the Manaus region, using data obtained by Doppler weather radar. Moreover, it is necessary to make the processing of raw data. Furthermore, it was necessary to make the processing of raw data. The treatment of the volume of radar data was done using the software TITAN (Thunderstorm, Identification, Tracking, analysis and Nowcasting) and visualization software for graphic Rview, both developed by NCAR. Results show that the presence of lines of precipitation detected in satellite images can be confirmed by the results obtained by processing the data generated by the Manaus radar. Besides the agreement in view of the events, the radar shows in detail the intensity and location of convection. Another advantage observed by comparing the radar data (reflectivity of field) with the satellite image is the possibility of obtaining vertical sections along the line of precipitation. Through this type of product you can determine the intensity of the fields of reflectivity and vertical location. The parameters that characterize the properties of storms such as average volume, average area, when the tops of echoes, reflectivity and maximum and average velocity and displacement of precipitating systems were determined considering the level of reflectivity equal to or greater than 35dBZ and volume greater than 50km3. The results indicate that small cells predominated but the volumes reach large values. About the areas of precipitation, the results show a predominance of small cells of precipitation during the period. Compared with results from studies in the literature it is evident the predominance of small cells associated with isolated thunderstorms and of short duration and multicellular storms. The information about how the storms observed by weather radar in Manaus are distributed on its duration and the time it takes to reach its maximum area summarize important information for a predictor operation that could of course taking into account other key parameters, use it to make a prediction about events of precipitation with a degree of confidence on a scale of very short term.