Ratio of UV to global broad band irradiation in Valencia, Spain

✍ Scribed by Martinez-Lozano, J.A.; Tena, F.; Utrillas, M.P.

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 89 KB
• Volume: 19
• Category: Article
• ISSN: 0899-8418
• DOI: 10.1002/(sici)1097-0088(19990630)19:8<903::aid-joc400>3.0.co;2-n

✦ Synopsis

This paper presents the results of an analysis of 6 years of measurements of UV and broad band irradiation values in Valencia, Spain. Hourly and daily integrated UV irradiance, I TUV , measured by a TUVR Eppley radiometer, and global irradiance I T from a Kipp-Zonen CM-11 pyranometer, were highly correlated, with I TUV /I T percentages varying from 2.9% to 3.5% for hourly values and from 2.9% to 3.4% for daily values. If a general linear relation I TUV =mI T is considered, the correlation coefficient r is always greater than 0.96 for hourly values and 0.91 for daily values. However, the relation between I TUV /I T and the clearness index k T is poorly correlated, although improved results, with less dependence on a specific location, can be observed using the k TUV and k T clearness indices. For a general linear relation, k TUV =mk T , the correlation coefficient r is always greater than 0.89 for hourly values and 0.86 for daily values.