Open AccessInfluences of the clearness index for the whole spectrum and of the relative optical air mass on UV solar irradiance for two locations in the Mediterranean area, Valencia and Cordoba
Author(s) -
Cañada J.,
Pedrós G.,
López A.,
Boscá J. V.
Publication year - 2000
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/1999jd901106
Subject(s) - irradiance , valencia , solar irradiance , environmental science , air mass (solar energy) , atmospheric sciences , ultraviolet , physics , optics , ecology , boundary layer , biology , thermodynamics
Ultraviolet solar irradiance (290–385 nm) was analyzed in Valencia and Cordoba, Spain, during 1996–1997. Its relation to the instantaneous atmospheric clearness index k t , the relative optical mass m r , the time of the year, and the total or global irradiance on a horizontal surface was established. The maximum values of UV irradiance for each optical mass exponentially diminished with the optical mass, thus for Cordoba and Valencia, G uv = 62.23 m r −1.34 and G uv = 52.84 m r −1.30 , respectively. The UV irradiance in Cordoba represented 4.2% of the total irradiance while in Valencia this percentage was 4.9%. In the case of cloudy days ( k t <0.4), these percentages ranged between 5.6% and 6.8% in Valencia and between 5.1% and 5.5% in Cordoba.