Abstract
Study of Atmospheric turbidity is important for purposes of meteorology, ecology, climatology and monitoring of atmospheric pollution. Linke Turbidity factor (LT) is commonly used to model the attenuation of solar radiation in the atmosphere. The probable dependence on the water vapor content of the relationship linking LT to Angstrom’s turbidity coefficient B, is discussed. In this study, a procedure for calculation of Linke turbidity factor is adopted using pyrheliometric measurements by Egyptian Typical Meteorological Year (ETMY) at a Thirteen stations at Egypt, during (from 1969 to 2006). Monthly variations of the LT turbidity factor are found in the three studied months, with a maximum in August and a minimum in July. Detailed studies on the effect of urbanization and industrialization on global solar radiation and the percentage values of radiation loss in the atmosphere, at Egypt, have been performed. The high values of LT (5-6) and B (0.48-0.52) lies between Lat. 28°N-30°N, low values of LT<3.5 and B<0.3 below of Lat. 26°N. 8 cities of the thirteen city used in the study are located in the maximum values of this period is the most civilized cities and concentrated a large part of the population which constitutes a danger to the health of the population and the spread of diseases resulting from atmospheric turbidity.
Highlights
Many locations, either on the basis of spectral irradiance or on all wavelengths direct irradiance data
The high values of Linke Turbidity factor (LT) (5-6) and B (0.48-0.52) lies between Lat. 28°N-30°N, low values of LT
Sites with an annual average wind speed of 8.0-10.0 msec−1 have been identified along the Red Sea coast and about 6.06.5 msec−1 along the Mediterranean coast
Summary
Many locations, either on the basis of spectral irradiance or on all wavelengths direct irradiance data. We estimate the atmospheric turbidity indices for different latitude of the thirteen stations at Egypt. With this selection it is possible to study the Monthly variation of atmospheric turbidity. With the solar radiation measurements, relative humidity, air temperature, mean total cloud cover, vapor pressure, rising sand, surface pressure, wind direction and wind speed were measured and recorded continuously on diurnal records. These atmospheric data characterize the types of air mass prevalent over the location of the radiation measurements. The design conditions are carefully generated, from a period of record (typically 30 years) to be representative of that location covered the almost region at Egypt
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