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A Study of linke turbidity factor over Qena / Egypt

Advances in Atmospheric Sciences 1996年第4期13卷 519-532页

作者： Sayed M. Elshazly Department of Physics Faculty of Science South Valley University Qena/A.R. Egypt

Data on instantaneous atmospheric linke turbidity factor TL (m) are reported for clear days at Qena/Egypt in the period from June 1992 to May ***(m) is determined using the values of irradiance of direct solar radiation (I),which are calculated from global (G) and diffuse (D) - solar radiation *** and seasonally variations of both diurnal and daily average values of TL (m) increases steadily in the direction of sunset in the months from June to December 1992 as well as Summer and Autumn seasons,while it falls generally in this direction for the months from January to March and Winter *** April and May,TL (m) fluctuates obviously through the day hours,it is also shown that the average values of TL(m) are particularly large during Summer months compared to other months of the *** behavior of TL(m) is discussed in view of the variations of some weather elements,which affect the content of water vapor and dust particle in the atmosphere of the study *** seems t be of similar trends to that of other locations inside and outside *** virtual variation of TL(m) is eliminated by reducing its value to relative optical air mass m=2,according to Kasten *** resulting TL (2) is more representative for the content of dust particles and water vapor in the atmosphere.

关键词： turbidity linke turbidity factor Seasonal and diurnal variations Solar radiations components measurements Aerosol

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Analysis of Atmospheric turbidity in Clear Skies at Wuhan,Central China

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Journal of Earth Science 2017年第4期28卷 729-738页

作者： Lunche Wang Yisen Chen Ying Niu German Ariel Salaza Wei Gong Department of Geography School of Earth SciencesChina University of GeosciencesWuhan 430074China Physics Department School of Exact SciencesSalta National UniversitySalta A4408FVYArgentina State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhan 430079China

The Angstr6m turbidity coefficient （β） and linke turbidity factor （TL） are used to study the atmospheric conditions in Wuhan, Central China, using measureβd direct solar radiation during 2010-2011 in this study. The results show that annual mean β values generally increase from 0.28 in the morning to 0.35 at noon, and then decrease to 0.1 in the late afternoon during the day; annual mean TL generally varies from 3 to 7 in Central China. Both turbidity coefficients have maximum values in spring and summer, while minimum values are observed in winter months. It also reveals that β values show preponderance （52.8%） between 0.15 and 0.35, 78.1% of TL values are between 3.3 and 7.7, which can be compared with other sites around the world. Relationship between turbidity coefficients and main me- teorological parameters （humidity, temperature and wind direction） have been further investigated, it is discovered that the local aerosol concentrations, dust events in northern China and Southwest Monsoon from the Indian Ocean influences the β values in the study area.

关键词： direct solar radiation AngstrOm turbidity coefficient linke turbidity factor Central China.

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