NDLI: SAOZ measurements of NO<sub>2</sub> at Aberystwyth

Content Provider	Royal Society of Chemistry (RSC)
Author	Bean, J. Green, A. C. Vaughan, G. Roscoe, H. K. Roozendael, M. Goutail, F. Quinn, P. T.
Copyright Year	2006
Abstract	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.
Starting Page	353
Ending Page	361
Page Count	9
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	8
Issue Number	3
Journal	Journal of Environmental Monitoring
DOI	10.1039/b511482a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Aberystwyth Wales Lerwick Scotland Spectrometer Mount Pinatubo Aerosol Cloud
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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