Variability and trends in stratospheric NO 2 in Antarctic summer, and implications for stratospheric NO y
NO 2 measurements during 1990–2007, obtained from a zenith-sky spectrometer in the Antarctic, are analysed to determine the long-term changes in NO 2 . An atmospheric photochemical box model and a radiative transfer model are used to improve the accuracy of determination of the vertical columns from...
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ftdoajarticles:oai:doaj.org/article:84acb4c3796d4f96b9ee54a4a3854ba7 2023-05-15T13:44:09+02:00 Variability and trends in stratospheric NO 2 in Antarctic summer, and implications for stratospheric NO y H. K. Roscoe P. A. Cook 2009-06-01T00:00:00Z https://doaj.org/article/84acb4c3796d4f96b9ee54a4a3854ba7 EN eng Copernicus Publications http://www.atmos-chem-phys.net/9/3601/2009/acp-9-3601-2009.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/84acb4c3796d4f96b9ee54a4a3854ba7 Atmospheric Chemistry and Physics, Vol 9, Iss 11, Pp 3601-3612 (2009) Physics QC1-999 Chemistry QD1-999 article 2009 ftdoajarticles 2022-12-31T00:42:08Z NO 2 measurements during 1990–2007, obtained from a zenith-sky spectrometer in the Antarctic, are analysed to determine the long-term changes in NO 2 . 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 NO y from NO 2 . We find that the NO 2 and NO y 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 NO y from NO 2 . 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. Article in Journal/Newspaper Antarc* Antarctic Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 H. K. Roscoe P. A. Cook Variability and trends in stratospheric NO 2 in Antarctic summer, and implications for stratospheric NO y |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
NO 2 measurements during 1990–2007, obtained from a zenith-sky spectrometer in the Antarctic, are analysed to determine the long-term changes in NO 2 . 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 NO y from NO 2 . We find that the NO 2 and NO y 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 NO y from NO 2 . 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. |
format |
Article in Journal/Newspaper |
author |
H. K. Roscoe P. A. Cook |
author_facet |
H. K. Roscoe P. A. Cook |
author_sort |
H. K. Roscoe |
title |
Variability and trends in stratospheric NO 2 in Antarctic summer, and implications for stratospheric NO y |
title_short |
Variability and trends in stratospheric NO 2 in Antarctic summer, and implications for stratospheric NO y |
title_full |
Variability and trends in stratospheric NO 2 in Antarctic summer, and implications for stratospheric NO y |
title_fullStr |
Variability and trends in stratospheric NO 2 in Antarctic summer, and implications for stratospheric NO y |
title_full_unstemmed |
Variability and trends in stratospheric NO 2 in Antarctic summer, and implications for stratospheric NO y |
title_sort |
variability and trends in stratospheric no 2 in antarctic summer, and implications for stratospheric no y |
publisher |
Copernicus Publications |
publishDate |
2009 |
url |
https://doaj.org/article/84acb4c3796d4f96b9ee54a4a3854ba7 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Atmospheric Chemistry and Physics, Vol 9, Iss 11, Pp 3601-3612 (2009) |
op_relation |
http://www.atmos-chem-phys.net/9/3601/2009/acp-9-3601-2009.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/84acb4c3796d4f96b9ee54a4a3854ba7 |
_version_ |
1766198283643912192 |