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SAOZ measurements of NO2 at Aberystwyth

dc.contributor.authorVaughan, G.
dc.contributor.authorQuinn, P.T.
dc.contributor.authorGreen, A.C.
dc.contributor.authorBean, J.
dc.contributor.authorRoscoe, H.K.
dc.contributor.authorVan Roozendael, M.
dc.contributor.authorGoutail, F.
dc.date2006
dc.date.accessioned2016-11-22T11:27:18Z
dc.date.available2016-11-22T11:27:18Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/4496
dc.descriptionWe present in this paper fifteen years' measurements, from March 1991 to September 2005, of stratospheric NO2 vertical columns measured by a SAOZ zenith-sky visible spectrometer. The instrument spent most of its time at Aberystwyth, Wales, with occasional excursions to other locations. The data have been analysed with the WinDOAS analysis program with low-temperature high-resolution NO2 cross-sections and fitting a slit function to each spectrum. Because of a change in detector in May 1998 there is some uncertainty about the relative changes before and after this date, which are partially constrained by the results of an intercomparison exercise. However, the effect of the Mt Pinatubo aerosol cloud is very evident in the data from 1991-94, with a decrease of 10% in NO2 in the summer of 1992 (the SAOZ was located in Lerwick, Scotland during the winter of 1991-92 and observed very low NO2 values but these cannot be directly compared to the Aberystwyth data). To focus more on interannual and long-term variations in NO2, a seasonal variation comprising an annual and semi-annual component was fitted to the morning and evening twilight separately from 1995 to the present. This fit yielded average NO2 columns of 4.08 × 1015 cm-2 and 2.68 × 1015 cm-2 for the evening and morning twilight, respectively, with a corresponding annual amplitude of ±2.08 × 1015 cm-2 and ±1.50 × 1015 cm-2. Departures from the fitted curve show a trend of 6% per decade, consistent with that reported elsewhere, for the period 1998-2003, but in the past two years a distinct interannual variation of amplitude of ∼8% has emerged.
dc.languageeng
dc.titleSAOZ measurements of NO2 at Aberystwyth
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freenitrogen dioxide
dc.subject.freenitrogen dioxide
dc.subject.freeozone
dc.subject.freeaerosol
dc.subject.freearticle
dc.subject.freedata analysis
dc.subject.freedata analysis software
dc.subject.freelow temperature
dc.subject.freenight
dc.subject.freepriority journal
dc.subject.freeseasonal variation
dc.subject.freespectrometer
dc.subject.freestratosphere
dc.subject.freesummer
dc.subject.freeUnited Kingdom
dc.subject.freeair pollutant
dc.subject.freealgorithm
dc.subject.freeenvironmental monitoring
dc.subject.freeinstrumentation
dc.subject.freemethodology
dc.subject.freeseason
dc.subject.freespectrophotometry
dc.subject.freetime
dc.subject.freeAir Pollutants
dc.subject.freeAlgorithms
dc.subject.freeEnvironmental Monitoring
dc.subject.freeNitrogen Dioxide
dc.subject.freeOzone
dc.subject.freeSeasons
dc.subject.freeSpectrophotometry
dc.subject.freeTime Factors
dc.subject.freeWales
dc.source.titleJournal of Environmental Monitoring
dc.source.volume8
dc.source.issue3
dc.source.page353-361
Orfeo.peerreviewedYes
dc.identifier.doi10.1039/b511482a
dc.identifier.scopus2-s2.0-33644923843


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