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Performance of the FMI cosine error correction method for the Brewer spectral UV measurements
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dc.contributor.authorLakkala, Kaisaes_ES
dc.contributor.authorArola, Antties_ES
dc.contributor.authorGröbner, Julianes_ES
dc.contributor.authorLeón-Luis, Sergio Fabiánes_ES
dc.contributor.authorRedondas, Albertoes_ES
dc.contributor.authorKazadzis, Stelioses_ES
dc.contributor.authorKarppinen, Tomies_ES
dc.contributor.authorKarhu, Juha Matties_ES
dc.contributor.authorEgli, Lucaes_ES
dc.contributor.authorHeikkilä, Anues_ES
dc.contributor.authorKoskela, Tapanies_ES
dc.contributor.authorSerrano, Antonioes_ES
dc.contributor.authorVilaplana Guerrero, José Manueles_ES
dc.identifier.citationAtmospheric Measurement Techniques. 2018, 11(9), p. 5167–5180es_ES
dc.description.abstractNon-ideal angular response of a spectroradiometer is a well-known error source of spectral UV measurements and for that reason instrument specific cosine error correction is applied. In this paper, the performance of the cosine error correction method of Brewer spectral UV measurements in use at the Finnish Meteorological Institute (FMI) is studied. Ideally, the correction depends on the actual sky radiation distribution, which can change even during one spectral scan due to rapid changes in cloudiness. The FMI method has been developed to take into account the changes in the ratio of direct to diffuse sky radiation and it derives a correction coefficient for each measured wavelength. Measurements of five Brewers were corrected for the cosine error and the results were compared to the reference travelling spectroradiometer (QASUME). Measurements were performed during the RBCC-E (Regional Brewer Calibration Center – Europe) X Campaign held at El Arenosillo, Huelva (37∘ N, 7∘ W), Spain, in 2015. In addition, results of site audits of FMI's Brewers in Sodankylä (67∘ N, 27∘ E) and Jokioinen (61∘ N, 24∘ E) during 2002–2014 were studied. The results show that the spectral cosine error correction varied between 4 and 14 %. After that the correction was applied to Brewer UV spectra the relative differences between the QASUME and the Brewer diminished even by 10 %. The study confirms that the method, originally developed for measurements at high latitudes, can be used at mid-latitudes as well. The method is applicable to other Brewers as far as the required input parameters, i.e. total ozone, aerosol information, albedo, instrument specific angular response and slit function are available.es_ES
dc.description.sponsorshipThis article is based upon work from the COST Action ES1207 “A European Brewer Network (EUBREWNET)”, supported by COST (European Cooperation in Science and Technology). This study was partially supported by the research projects CGL2014-56255-C2-1-R and CGL2014-56255-C2-2-R granted by the Ministerio de Economa y Competitividad from Spain.es_ES
dc.publisherEuropean Geosciences Uniones_ES
dc.rightsLicencia CC: Reconocimiento CC BYes_ES
dc.subjectBrewer measurementes_ES
dc.subjectCosine errores_ES
dc.subjectBrewer measurementes_ES
dc.titlePerformance of the FMI cosine error correction method for the Brewer spectral UV measurementses_ES
Appears in Collections:Artículos científicos 2015-2018

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