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Ratio of UV to global broad band irradiation in Valencia, Spain
Author(s) -
MartinezLozano J.A.,
Tena F.,
Utrillas M.P.
Publication year - 1999
Publication title -
international journal of climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.58
H-Index - 166
eISSN - 1097-0088
pISSN - 0899-8418
DOI - 10.1002/(sici)1097-0088(19990630)19:8<903::aid-joc400>3.0.co;2-n
Subject(s) - pyranometer , irradiance , radiometer , correlation coefficient , atmospheric sciences , environmental science , linear correlation , valencia , linear relationship , mathematics , meteorology , climatology , statistics , remote sensing , geography , physics , optics , geology , ecology , biology
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. Copyright © 1999 Royal Meteorological Society