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Variability and trends in stratospheric NO2 in Antarctic summer, and implications for stratospheric NOy

Cook, P.A.; Roscoe, Howard K.. 2009 Variability and trends in stratospheric NO2 in Antarctic summer, and implications for stratospheric NOy. Atmospheric Chemistry and Physics, 9 (11). 3601-3612. 10.5194/acp-9-3601-2009

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Abstract/Summary

NO2 measurements during 1990-2007, obtained from a zenith-sky spectrometer in the Antarctic, are analysed to determine the long-term changes in NO2. An atmospheric photochemical box model and a radiative transfer model are used to improve the accuracy of determination of the vertical columns from the slant column measurements, and to deduce the amount of NOy from NO2. We find that the NO2 and NOy columns in midsummer have large inter-annual variability superimposed on a broad maximum in 2000, with little or no overall trend over the full time period. These changes are robust to a variety of alternative settings when determining vertical columns from slant columns or determining NOy from NO2. They may signify similar changes in speed of the Brewer-Dobson circulation but with opposite sign, i.e. a broad minimum around 2000. Multiple regressions show significant correlation with solar and quasi-biennial-oscillation indices, and weak correlation with El Nino, but no significant overall trend, corresponding to an increase in Brewer-Dobson circulation of 1.4+/-3.5%/decade. There remains an unexplained cycle of amplitude and period at least 15% and 17 years, with minimum speed in about 2000.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.5194/acp-9-3601-2009
Programmes: BAS Programmes > Other
ISSN: 1680-7316
Additional Information. Not used in RCUK Gateway to Research.: Open access article made available under a CC-BY Creative Commons Attribution license.
NORA Subject Terms: Atmospheric Sciences
Date made live: 20 Oct 2010 11:11
URI: http://nora.nerc.ac.uk/id/eprint/10748

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