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SAOZ measurements of stratospheric NO2 at Aberystwyth

Vaughan, G.; Quinn, P.T.; Green, A.C.; Bean, J.; Roscoe, H.K.; Roozendael, M. Van; Goutail, F.. 2006 SAOZ measurements of stratospheric NO2 at Aberystwyth. Journal of Environmental Monitoring, 8 (3). 353-361. 10.1039/b511482a

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Abstract/Summary

-------------------------------------------------------------------------------- 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.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1039/b511482a
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Long-Term Monitoring and Survey – Physical Sciences Division
ISSN: 1464-0325
Format Availability: Electronic, Print
Additional Information. Not used in RCUK Gateway to Research.: Full text not available from this repository
Additional Keywords: Nitrogen dioxide ; Stratosphere
NORA Subject Terms: Meteorology and Climatology
Date made live: 24 Jul 2007 13:56
URI: http://nora.nerc.ac.uk/id/eprint/147

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