Desenvolvimento de um algoritmo para o cálculo da espessura óptica dos aerossóis a partir de dados de um fotómetro solar

Abstract

In this degree work, a study is made of the interaction of direct solar radiation with the constituents of the Earth's atmosphere, in particular aerosols. As it travels through the atmosphere, electromagnetic radiation is attenuated by scattering and absorption processes caused by particles (called aerosols) and atmospheric gas molecules. These phenomena are related by optical thickness. An algorithm for calculating the Optical Aerosol Thickness (OAE) from data measured by a solar photometer was developed. For this, two solar photometers were used, the Hazemeter and the Microtops II. Measurements were made in two phases. In the first phase, measurements of solar radiation intensities were made with the Hazemeter solar photometer at three points in the city of Maputo (Alto-Maé, Xipamanine and Campus Universitário), in order to test the algorithm. In the second phase, simultaneous measurements of solar radiation were made with the solar photometers Hazemeter and Microtops II, only in the Alto-Maé zone. The results indicate that with this algorithm reliable EOA values ​​can be obtained and these values ​​can be used as indicators of pollution levels. It is verified that there is a positive correlation with the EOA values ​​and the turbidity of the atmosphere.(TRADUÇÃO NOSSA)