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    SAOZ measurements of NO2 at Aberystwyth

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    Vaughan(2006).pdf (1.519Mb)
    Authors
    Vaughan, G.
    Quinn, P.T.
    Green, A.C.
    Bean, J.
    Roscoe, H.K.
    Van Roozendael, M.
    Goutail, F.
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    Discipline
    Earth and related Environmental sciences
    Subject
    nitrogen dioxide
    nitrogen dioxide
    ozone
    aerosol
    article
    data analysis
    data analysis software
    low temperature
    night
    priority journal
    seasonal variation
    spectrometer
    stratosphere
    summer
    United Kingdom
    air pollutant
    algorithm
    environmental monitoring
    instrumentation
    methodology
    season
    spectrophotometry
    time
    Air Pollutants
    Algorithms
    Environmental Monitoring
    Nitrogen Dioxide
    Ozone
    Seasons
    Spectrophotometry
    Time Factors
    Wales
    Audience
    Scientific
    Date
    2006
    Metadata
    Show full item record
    Description
    We 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.
    Citation
    Vaughan, G.; Quinn, P.T.; Green, A.C.; Bean, J.; Roscoe, H.K.; Van Roozendael, M.; Goutail, F. (2006). SAOZ measurements of NO2 at Aberystwyth. , Journal of Environmental Monitoring, Vol. 8, Issue 3, 353-361, DOI: 10.1039/b511482a.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/4496
    doi: http://dx.doi.org/10.1039/b511482a
    scopus: 2-s2.0-33644923843
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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