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Slant column measurements of O3 and NO2 during the NDSC intercomparison of zenith-sky UV-visible spectrometers in June 1996

dc.contributor.authorRoscoe, H.K.
dc.contributor.authorJohnston, P.V.
dc.contributor.authorVan Roozendael, M.
dc.contributor.authorRichter, A.
dc.contributor.authorSarkissian, A.
dc.contributor.authorRoscoe, J.
dc.contributor.authorPreston, K.E.
dc.contributor.authorLambert, J.-C.
dc.contributor.authorHermans, C.
dc.contributor.authorDecuyper, W.
dc.contributor.authorDzienus, S.
dc.contributor.authorWinterrath, T.
dc.contributor.authorBurrows, J.
dc.contributor.authorGoutail, F.
dc.contributor.authorPommereau, J.-P.
dc.contributor.authorD'Almeida, E.
dc.contributor.authorHottier, J.
dc.contributor.authorCoureul, C.
dc.contributor.authorDidier, R.
dc.contributor.authorPundt, I.
dc.contributor.authorBartlett, L.M.
dc.contributor.authorMcElroy, C.T.
dc.contributor.authorKerr, J.E.
dc.contributor.authorElokhov, A.
dc.contributor.authorGiovanelli, G.
dc.contributor.authorRavegnani, F.
dc.contributor.authorPremuda, M.
dc.contributor.authorKostadinov, I.
dc.contributor.authorErle, F.
dc.contributor.authorWagner, T.
dc.contributor.authorPfeilsticker, K.
dc.contributor.authorKenntner, M.
dc.contributor.authorMarquard, L.C.
dc.contributor.authorGil, M.
dc.contributor.authorPuentedura, O.
dc.contributor.authorYela, M.
dc.contributor.authorArlander, D.W.
dc.contributor.authorKastad, Hoiskar, B.A.
dc.contributor.authorTellefsen, C.W.
dc.contributor.authorKarlsen Tornkvist, K.
dc.contributor.authorHeese, B.
dc.contributor.authorJones, R.L.
dc.contributor.authorAliwell, S.R.
dc.contributor.authorFreshwater, R.A.
dc.date1999
dc.date.accessioned2017-05-09T11:58:42Z
dc.date.available2017-05-09T11:58:42Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/5367
dc.descriptionIn June 1996, 16 UV-visible sensors from 11 institutes measured spectra of the zenith sky for more than 10 days. Spectra were analysed in real-time to determine slant column amounts of O3 and NO2. Spectra of Hg lamps and lasers were measured, and the amount of NO2 in a cell was determined by each spectrometer. Some spectra were re-analysed after obvious errors were found. Slant columns were compared in two ways: by examining regression analyses against comparison instruments over the whole range of solar zenith angles; and by taking fractional differences from a comparison instrument at solar zenith angles between 85°and 91°. Regression identified which pairs of instruments were most consistent, and so which could be used as universal comparison instruments. For O3, regression slopes for the whole campaign agreed within 5% for most instruments despite the use of different cross-sections and wavelength intervals, whereas similar agreement was only achieved for NO2 when the same cross-sections and wavelength intervals were used and only one half-day's data was analysed. Mean fractional differences in NO2 from a comparison instrument fall within ± 7% (1-sigma) for most instruments, with standard deviations of the mean differences averaging 4.5%. Mean differences in O3 fall within ± 2.5% (1-sigma) for most instruments, with standard deviations of the mean differences averaging 2%. Measurements of NO2 in the cell had similar agreement to measurements of NO2 in the atmosphere, but for some instruments measurements with cell and atmosphere relative to a comparison instrument disagreed by more than the error bars.
dc.languageeng
dc.titleSlant column measurements of O3 and NO2 during the NDSC intercomparison of zenith-sky UV-visible spectrometers in June 1996
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freenitrogen dioxide
dc.subject.freeozone
dc.subject.freenitrogen dioxide
dc.subject.freeozone
dc.subject.freeair analysis
dc.subject.freearticle
dc.subject.freeregression analysis
dc.subject.freereliability
dc.subject.freesensor
dc.subject.freespectrometer
dc.subject.freeultraviolet spectroscopy
dc.source.titleJournal of Atmospheric Chemistry
dc.source.volume32
dc.source.issue2
dc.source.page281-314
Orfeo.peerreviewedYes
dc.identifier.doi10.1023/A:1006111216966
dc.identifier.scopus2-s2.0-0032992860


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