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标题：Diurnal Evolution of Solar Radiation in UV, PAR and NIR Bands in High Air Masses
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作者：Jackson H. W. Chang ; Jedol Dayou ; Justin Sentian 等
期刊名称：Nature, Environment and Pollution Technology
印刷版ISSN：0972-6268
出版年度：2013
卷号：12
期号：1
语种：English
出版社：Technoscience Publications
摘要：Solar surface insolation appears constant from an everyday’s point of view but this quantity has been foundto be changing in small scale that may lead to climate change over an extended period of time. However, thefactors impacting this variance are always a subject of much debate. In long term observations for low airmasses, the variation is governed by cloud cover, aerosol loading, relative humidity as well as water vaporcontent. Parallel observations in high air masses for the variation of received solar radiation are ratherlacking. To fill up the existing gap, this paper aims to investigate the diurnal evolution of solar radiationspectrum in UV, PAR and NIR bands in high air masses. In the current work, a total of 25 days of global anddiffuse solar spectrum ranges from air mass 2 to 6 were collected using shadowband technique. It is foundthat the evolution pattern for all spectral components follows a high coefficient of determination with respectto global radiation. The result analysis also shows that variation of solar radiation is the least in UV fraction,followed by PAR and the most in NIR fraction. It is deduced that the broader amplitude of fraction in PAR andNIR because they incorporate variation of aerosol and water vapor. Decreasing trend in NIR fraction forconstant UV fraction is likely associated to the increase of water vapor content. While reduction of PARfraction for specific air mass interval is due to the increase in aerosol loading.