ATMOSPHERIC TURBIDITY OF THE LINKE MODEL IN BOTUCATU/SAO PAULO, BRAZIL
DOI:
https://doi.org/10.59627/cbens.2014.2158Keywords:
Linke, Atmosphere, Aerosols, Water vapor, TurbidityAbstract
The attenuation of beam irradiance at normal incidence (Ib) in a clean and dry atmosphere is represented by atmospheric turbidity factor. This is an index that indirectly indicates the level of pollution in the local atmosphere, being of great importance in studies relative the climatology, atmospheric pollution, indirect measurement of aerosol concentration, an indirect measure of water vapor and indirect measurement of beam irradiance at normal incidence (Ib). In this work of Linke turbidity factor (TL) is calculated based on two methodologies (TLDj and TLLi), to Botucatu/SP. The data series used was the period from 1996 to 2008. The results show the highest values of turbidity in spring and summer (TLDj between 4.093 and 4.39; TLLi between 4.51 and 4.83). The months between April and August had the lowest values (TLDj = 3.21 ± 0.95 in may and TLDj = 3.46 ± 0.89 in august; TLLi = 3.55 ± 1.03 in may and 3.84 ± 0.98 in august). To TLLi approximately 92.06% of the occurrences of turbidity are in the interval (2.0-6.0) and 93.95% of occurrences for TLDj. The wind speed and air temperature positively correlated with atmospheric turbidity. The results indicate that when TLDj ≤ 2.0% occurred ≈ 41.83 hours of clear sky, representing a Rayleigh's atmosphere pure and clear. When (2.0 <TLDj ≤ 4.0) ≈ 30.50% of TL shows a cloudy atmosphere. About ≈ 28.12% of hours clean, the turbidity obtained exceeded 4.0, representing an atmosphere with high turbidity or polluted. The Botucatu region is strongly influenced by water vapor and aerosols source in adjacent locations.
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