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Determination of diurnal daylight courses for a central European region

机译:确定中欧地区白天的日间课程

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摘要

The diurnal course of daylight (exterior illuminance) during winter and summer in a central European town, Bratislava, Slovakia, is studied. By using multivariate statistical methods (Factor and Cluster Analysis), the most significant types of the diurnal variations of illuminance are determined. The database used consists of mean 5-min values of global horizontal illuminance for the 14-year period 1994-2007. Two sets of data (sunrise-noon, noon-sunset) are utilized for each season, consisting of the anomalies of the semi-diurnal courses of illuminance with respect to the mean semi-diurnal course on each calendar day of the year. For winter, six typical semi diurnal courses for sunrise-noon and nine for noon-sunrise are found, and for summer, six for sunrise-noon and seven for noon-sunset. For each type of semi-diurnal course, the most representative day is selected. Finally, for a verification of the results the atmospheric circulation patterns near the surface and at the 500-hPa level, the distribution of precipitation over Europe as well as the meteorological observations are presented, for these days.
机译:研究了斯洛伐克中部小镇布拉迪斯拉发在冬季和夏季白天的日照(外部照度)。通过使用多元统计方法(因子和聚类分析),可以确定照度日变化的最重要类型。使用的数据库由1994年至2007年这14年期间的全球水平照度的平均5分钟值组成。每个季节使用两组数据(日出-中午,日落-中午),包括照度半日照度过程与一年中每个日历日的平均半日照度过程的异常。在冬季,发现了六个典型的半日式课程,用于日出-中午,九个用于日中日出,而在夏季,则找到了六个典型的半日式课程,用于日出-中午,七个在日中-日落。对于每种半日制课程,选择最具代表性的一天。最后,为验证结果,近些年来,提出了近地表和500-hPa水平的大气环流模式,欧洲的降水分布以及气象观测资料。

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