版权所有:内蒙古大学图书馆 技术提供:维普资讯• 智图
内蒙古自治区呼和浩特市赛罕区大学西街235号 邮编: 010021
作者机构:Univ Estadual Paulista DRN Fac Ciencias Agron Sch Agron Sci BR-18603970 Botucatu SP Brazil Univ Sao Paulo Inst Astron Geophys & Atmospher Sci Dept Atmospher Sci Grp Micrometeorol Sao Paulo Brazil Univ Fed Goias Dept Geog Jatai Go Brazil
出 版 物:《THEORETICAL AND APPLIED CLIMATOLOGY》 (理论和应用气候学)
年 卷 期:2003年第75卷第3-4期
页 面:213-224页
核心收录:
学科分类:07[理学] 070601[理学-气象学] 0706[理学-大气科学]
主 题:solar radiation Probability functions Linear Combination Frequency distribution Indexes air masses Modeling
摘 要:Five minute-averaged values of sky clearness, direct and diffuse indices, were used to model the frequency distributions of these variables in terms of optical air mass. From more than four years of solar radiation observations it was found that variations in the frequency distributions of the three indices of optical air mass for Botucatu, Brazil, are similar to those in other places, as published in the literature. The proposed models were obtained by linear combination of normalized Beta probability functions, using the observed distributions derived from three years of data. The versatility of these functions allows modelling of all three irradiance indexes to similar levels of accuracy. A comparison with the observed distributions obtained from one year of observations indicate that the models are able to reproduce the observed frequency distributions of all three indices at the 95% confidence level.