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Comparison of measured and modelled spectral UV irradiance at Izaña high mountain station: estimation of the underlying effective albedo

2015; Wiley; Volume: 36; Issue: 1 Linguagem: Inglês

10.1002/joc.4355

1097-0088

Rosa Delia García, Victoria E. Cachorro, Emilio Cuevas, Carlos Toledano, Alberto Redondas, M. Blumthaler, Y. Benounna,

Atmospheric chemistry and aerosols

International Journal of ClimatologyVolume 36, Issue 1 p. 377-388 RESEARCH ARTICLE Comparison of measured and modelled spectral UV irradiance at Izaña high mountain station: estimation of the underlying effective albedo R. D. García, Corresponding Author R. D. García Atmospheric Optics Group, Valladolid University, Spain Izaña Atmospheric Research Center, Agencia Estatal de Meteorología (AEMET), Santa Cruz de Tenerife, SpainCorrespondence to: R. D. García, Atmospheric Optics Group, Valladolid University, Valladolid, Spain. E-mail: rgarciac@aemet.esSearch for more papers by this authorV. E. Cachorro, V. E. Cachorro Atmospheric Optics Group, Valladolid University, SpainSearch for more papers by this authorE. Cuevas, E. Cuevas Izaña Atmospheric Research Center, Agencia Estatal de Meteorología (AEMET), Santa Cruz de Tenerife, SpainSearch for more papers by this authorC. Toledano, C. Toledano Atmospheric Optics Group, Valladolid University, SpainSearch for more papers by this authorA. Redondas, A. Redondas Izaña Atmospheric Research Center, Agencia Estatal de Meteorología (AEMET), Santa Cruz de Tenerife, SpainSearch for more papers by this authorM. Blumthaler, M. Blumthaler Division of Biomedical Physics, Innsbruck Medical University, AustriaSearch for more papers by this authorY. Benounna, Y. Benounna Atmospheric Optics Group, Valladolid University, SpainSearch for more papers by this author R. D. García, Corresponding Author R. D. García Atmospheric Optics Group, Valladolid University, Spain Izaña Atmospheric Research Center, Agencia Estatal de Meteorología (AEMET), Santa Cruz de Tenerife, SpainCorrespondence to: R. D. García, Atmospheric Optics Group, Valladolid University, Valladolid, Spain. E-mail: rgarciac@aemet.esSearch for more papers by this authorV. E. Cachorro, V. E. Cachorro Atmospheric Optics Group, Valladolid University, SpainSearch for more papers by this authorE. Cuevas, E. Cuevas Izaña Atmospheric Research Center, Agencia Estatal de Meteorología (AEMET), Santa Cruz de Tenerife, SpainSearch for more papers by this authorC. Toledano, C. Toledano Atmospheric Optics Group, Valladolid University, SpainSearch for more papers by this authorA. Redondas, A. Redondas Izaña Atmospheric Research Center, Agencia Estatal de Meteorología (AEMET), Santa Cruz de Tenerife, SpainSearch for more papers by this authorM. Blumthaler, M. Blumthaler Division of Biomedical Physics, Innsbruck Medical University, AustriaSearch for more papers by this authorY. Benounna, Y. Benounna Atmospheric Optics Group, Valladolid University, SpainSearch for more papers by this author First published: 27 April 2015 https://doi.org/10.1002/joc.4355Citations: 10Read the full textAboutRelatedInformationPDFPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessClose modalShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL ABSTRACT In this work, we have carried out a comparison study between measured and modelled direct and global ultraviolet (UV) (300–400 nm) spectral irradiances and the determination of the surface effective albedo at the high altitude Izaña Observatory [IZO; 2400 m above sea level (a.s.l.)] located in Tenerife (Canary Islands, Spain). The spectral measurements were performed with a Bentham spectroradiometer during the Quality Assurance of Solar Ultraviolet Spectral Irradiance Measurements (QASUME) comparison campaign in June 2005. The simulations were obtained with the LibRadtran radiative transfer model. The model input parameters, such as total ozone and aerosol optical depth (AOD), were measured at IZO. The comparison between measured and modelled direct solar radiation component was made at 0.5 nm spectral resolution, showing excellent agreement, with differences below 5% for solar zenith angle (SZA) < 60°. These differences were attributed to the effect of the underlying surface albedo due to the frequent existence of a sea of clouds below the station altitude. The underlying surface albedo was determined using different methods. In spite of the variability of this parameter through the day due to the strong influence and variable structure of these underlying clouds, the mean of this effective surface albedo in the UV region gives a value between 0.2 and 0.5 in the UV range, 10 times higher than the local surface albedo (0.02–0.05). Citing Literature Supporting Information Filename Description joc4355-sup-0001-AppendixS1.docxWord 2007 document , 15.5 KB Appendix S1. Influence of AOD on the UV spectral. joc4355-sup-0002-FigureS1.docxWord 2007 document , 141 KB Figure S1. (a) AOD versus the wavelength (nm) for four combinations of α and β Angstrom parameters as indicated in the legend of the figure. (b) Relative differences (%) of the global irradiance at 340 nm as a function of the single scattering albedo (between 0.6 and 1) for different AOD values as indicated in the figure. SZA = 30° (see text for details). joc4355-sup-0003-FigureS2.docxWord 2007 document , 202.9 KB Figure S2. Relative differences between UV spectral global irradiance measurements and the simulations performed with LibRadtran model considering different values of surface albedo (see legend) on 1 June 2005 [1300 UTC, SZA = 6.3°, AOD (340 nm) = 0.082 and total ozone column = 294 DU]. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article. 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