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Comparison and Validation of Aerosol Optical Depth Obtained with the Langley Plot Method in the UV-B from Brewer Ozone Spectrophotometer Measurements

dc.contributor.authorCheymol, A.
dc.contributor.authorDe Backer, H.
dc.contributor.authorJosefsson, W.
dc.contributor.authorStübi, R.
dc.coverage.temporal21st century
dc.date2006
dc.date.accessioned2016-03-07T16:16:53Z
dc.date.accessioned2021-12-09T09:53:40Z
dc.date.available2016-03-07T16:16:53Z
dc.date.available2021-12-09T09:53:40Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/8717
dc.descriptionThe Aerosol Optical Depths (AODs) retrieved from Brewer Ozone Spectrophotometer measurements with a method previously developed (Cheymol and De Backer, 2003) are now validated by comparisons between AODs from six Brewer spectrophotometers and two CSEM SPM2000 sunphotometers: two Brewer spectrophotometers 016 and 178 at Uccle in Belgium; one Brewer spectrophotometer 128 and one sunphotometer CSEM SPM2000 at Norrko¨ping in Sweden; and three Brewer instruments 040, 072, 156 at Arosa and one CSEM SPM2000 sunphotometer at Davos in Switzerland. The comparison between AODs from Brewer spectrophotometer 128 at 320.1 nm and sunphotometer SPM2000 at 368 nm at Norrko¨ping shows that the AODs obtained from the Brewer measurements with the Langley Plot Method (LPM) are very accurate if the neutral density filter spectral transmittances are well known: with the measured values of these filters, the correlation coefficient, the slope, and the intercept of the regression line are 0.98, 0.85 ± 0.004, and 0.02 ± 0.0014, respectively. The bias observed is mainldy owing to the wavelength difference between the two instruments. The comparison between AODs from different Brewer spectrophotometers confirm that AODs will be in very good agreement if they are measured with several Brewer instruments at the same place: At Uccle, the correlation coefficient, slope, and intercept of the regression line are 0.98, 1.02 ± 0.003, and 0.06 ± 0.001, respectively; at Arosa, the comparisons between the AODs from three Brewer spectrophotometers 040, 072, and 156 give a correlation coefficient, a slope, and an intercept of the regression line above 0.94, 0.98 and below 0.04, respectively.
dc.languageeng
dc.publisherIRM
dc.publisherKMI
dc.publisherRMI
dc.relation.ispartofseriesJournal of Geophysical Research, 111, D16202,
dc.titleComparison and Validation of Aerosol Optical Depth Obtained with the Langley Plot Method in the UV-B from Brewer Ozone Spectrophotometer Measurements
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceGeneral Public
dc.audienceScientific
dc.subject.freeThe Aerosol Optical Depths (AODs)
dc.subject.freeBrewer Ozone Spectrophotometer
dc.subject.freesunphotometers
dc.subject.freespectrophotometers
dc.subject.freeDavos
dc.subject.freeSwitserland
dc.source.issueJournal of Geophysical Research, 111, D16202,
dc.source.page0-0
Orfeo.peerreviewedNot pertinent
dc.identifier.doidoi:10.1029/2006JD007131


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