Determination of Linke?￠????s Turbidity Factors from Model and Measure Solar Radiations in the Tropics Over Highland of South-East Ethiopia.

摘要

Linke’s turbidity factors T, and perceptible water vapor in the atmosphere are essential for evaluating pollution trends in the area. The rise of T, is directly related to deforestation, industrialization, urbanization and influx of dusts and particulate matters from closer and far distance to the region. In this study, there is a computation of T, from three methods global solar radiation (GSR) data. These are model, ground and satellite recorded GSR. The model codes of mathematical equations in determining model GSR and T, were handled by MATLAB tool. The T, from model GSR were compared with ground and satellite GSR in terms of statistical evaluation indicators: The coefficient of determination (R2), root mean squared error (RMSE), Nash-Sutcliffe efficiency (E), its relative efficiency criteria (Er), index agreement (d) and its relative efficiency criteria (dr). All T,s from the model, ground and satellite GSR are approximately varied between 4 and 8. The rising levels have been approximately found in the range between 20% and 37.5% as compared to T, of tropical warm air (continental) since 1947. Atmospheric turbidity is an important procedure for early warning on monitoring air, water, soil quality for stability of healthy ecosystem.