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On the estimation of annual and monthly mean values of sunshine duration over Greece
Author(s) -
Flocas A. A.
Publication year - 1987
Publication title -
journal of climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.58
H-Index - 166
eISSN - 1097-0088
pISSN - 0196-1748
DOI - 10.1002/joc.3370070108
Subject(s) - sunshine duration , latitude , longitude , altitude (triangle) , climatology , atmospheric sciences , regression analysis , linear regression , duration (music) , environmental science , mathematics , statistics , meteorology , geography , geodesy , geology , relative humidity , physics , geometry , acoustics
Annual and monthly values of sunshine duration at thirty‐seven stations in Greece are examined with the three factors of latitude, longitude and altitude by means of stepwise multiple regression analysis. The validity of the assumption that there is a linear relationship between the mean values of sunshine duration and these three factors is examined. A seasonal variation is evident in all the computed gradients of the sunshine duration, with altitude effects being at a maximum in summer, whereas the effects of latitude were most pronounced during the cold season. The thirteen empirical formulae produced do not account completely for all the variability in the data, but the resultant correlation coefficients range from 0.830 to 0.906. The residuals (i.e. differences) between actual and calculated values of sunshine duration are shown on representative maps which may be used (with the regression equations) to estimate sunshine at any locality in Greece.