Hemispheric asymmetry in stratospheric NO 2 trends
Over 20 years of stratospheric NO 2 vertical column density (VCD) data from ground-based zenith DOAS spectrometers were used for trend analysis, specifically, via multiple linear regression. Spectrometers from the Network for the Detection of Atmospheric Composition Change (NDACC) cover the subtropi...
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ftdoajarticles:oai:doaj.org/article:bdfbc50216e444fcb0fa0ec41a7352dc 2023-05-15T13:52:17+02:00 Hemispheric asymmetry in stratospheric NO 2 trends M. Yela M. Gil-Ojeda M. Navarro-Comas D. Gonzalez-Bartolomé O. Puentedura B. Funke J. Iglesias S. Rodríguez O. García H. Ochoa G. Deferrari 2017-11-01T00:00:00Z https://doi.org/10.5194/acp-17-13373-2017 https://doaj.org/article/bdfbc50216e444fcb0fa0ec41a7352dc EN eng Copernicus Publications https://www.atmos-chem-phys.net/17/13373/2017/acp-17-13373-2017.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-17-13373-2017 1680-7316 1680-7324 https://doaj.org/article/bdfbc50216e444fcb0fa0ec41a7352dc Atmospheric Chemistry and Physics, Vol 17, Pp 13373-13389 (2017) Physics QC1-999 Chemistry QD1-999 article 2017 ftdoajarticles https://doi.org/10.5194/acp-17-13373-2017 2022-12-30T22:49:25Z Over 20 years of stratospheric NO 2 vertical column density (VCD) data from ground-based zenith DOAS spectrometers were used for trend analysis, specifically, via multiple linear regression. Spectrometers from the Network for the Detection of Atmospheric Composition Change (NDACC) cover the subtropical latitudes in the Northern Hemisphere (Izaña, 28° N), the southern Subantarctic (Ushuaia, 55° S) and Antarctica (Marambio, 64° S, and Belgrano, 78° S). The results show that for the period 1993–2014, a mean positive decadal trend of +8.7 % was found in the subtropical Northern Hemisphere stations, and negative decadal trends of −8.7 and −13.8 % were found in the Southern Hemisphere at Ushuaia and Marambio, respectively; all trends are statistically significant at 95 %. Belgrano only shows a significant decadal trend of −11.3 % in the summer/autumn period. Most of the trends result from variations after 2005. The trend in the diurnal build-up per hour (DBU) was used to estimate the change in the rate of N 2 O 5 conversion to NO 2 during the day. With minor differences, the results reproduce those obtained for NO 2 . The trends computed for individual months show large month-to-month variability. At Izaña, the maximum occurs in December (+13.1 %), dropping abruptly to lower values in the first part of the year. In the Southern Hemisphere, the polar vortex dominates the monthly distributions of the trends. At Marambio, the maximum occurs in mid-winter (−21 %), whereas at the same time, the Ushuaia trend is close to its annual minimum (−7 %). The large difference in the trends at these two relatively close stations suggests a vortex shift towards the Atlantic/South American area over the past few years. Finally, the hemispheric asymmetry obtained in this work is discussed in the framework of the results obtained by previous works that considered tracer analysis and Brewer–Dobson circulation. The results obtained here provide evidence that the NO 2 produced by N 2 O decomposition is not the only cause of the observed ... Article in Journal/Newspaper Antarc* Antarctica Directory of Open Access Journals: DOAJ Articles Belgrano ENVELOPE(-64.967,-64.967,-65.150,-65.150) Marambio ENVELOPE(-56.750,-56.750,-64.283,-64.283) Ushuaia ENVELOPE(-40.000,-40.000,-82.167,-82.167) Atmospheric Chemistry and Physics 17 21 13373 13389 |
institution |
Open Polar |
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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 M. Yela M. Gil-Ojeda M. Navarro-Comas D. Gonzalez-Bartolomé O. Puentedura B. Funke J. Iglesias S. Rodríguez O. García H. Ochoa G. Deferrari Hemispheric asymmetry in stratospheric NO 2 trends |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Over 20 years of stratospheric NO 2 vertical column density (VCD) data from ground-based zenith DOAS spectrometers were used for trend analysis, specifically, via multiple linear regression. Spectrometers from the Network for the Detection of Atmospheric Composition Change (NDACC) cover the subtropical latitudes in the Northern Hemisphere (Izaña, 28° N), the southern Subantarctic (Ushuaia, 55° S) and Antarctica (Marambio, 64° S, and Belgrano, 78° S). The results show that for the period 1993–2014, a mean positive decadal trend of +8.7 % was found in the subtropical Northern Hemisphere stations, and negative decadal trends of −8.7 and −13.8 % were found in the Southern Hemisphere at Ushuaia and Marambio, respectively; all trends are statistically significant at 95 %. Belgrano only shows a significant decadal trend of −11.3 % in the summer/autumn period. Most of the trends result from variations after 2005. The trend in the diurnal build-up per hour (DBU) was used to estimate the change in the rate of N 2 O 5 conversion to NO 2 during the day. With minor differences, the results reproduce those obtained for NO 2 . The trends computed for individual months show large month-to-month variability. At Izaña, the maximum occurs in December (+13.1 %), dropping abruptly to lower values in the first part of the year. In the Southern Hemisphere, the polar vortex dominates the monthly distributions of the trends. At Marambio, the maximum occurs in mid-winter (−21 %), whereas at the same time, the Ushuaia trend is close to its annual minimum (−7 %). The large difference in the trends at these two relatively close stations suggests a vortex shift towards the Atlantic/South American area over the past few years. Finally, the hemispheric asymmetry obtained in this work is discussed in the framework of the results obtained by previous works that considered tracer analysis and Brewer–Dobson circulation. The results obtained here provide evidence that the NO 2 produced by N 2 O decomposition is not the only cause of the observed ... |
format |
Article in Journal/Newspaper |
author |
M. Yela M. Gil-Ojeda M. Navarro-Comas D. Gonzalez-Bartolomé O. Puentedura B. Funke J. Iglesias S. Rodríguez O. García H. Ochoa G. Deferrari |
author_facet |
M. Yela M. Gil-Ojeda M. Navarro-Comas D. Gonzalez-Bartolomé O. Puentedura B. Funke J. Iglesias S. Rodríguez O. García H. Ochoa G. Deferrari |
author_sort |
M. Yela |
title |
Hemispheric asymmetry in stratospheric NO 2 trends |
title_short |
Hemispheric asymmetry in stratospheric NO 2 trends |
title_full |
Hemispheric asymmetry in stratospheric NO 2 trends |
title_fullStr |
Hemispheric asymmetry in stratospheric NO 2 trends |
title_full_unstemmed |
Hemispheric asymmetry in stratospheric NO 2 trends |
title_sort |
hemispheric asymmetry in stratospheric no 2 trends |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/acp-17-13373-2017 https://doaj.org/article/bdfbc50216e444fcb0fa0ec41a7352dc |
long_lat |
ENVELOPE(-64.967,-64.967,-65.150,-65.150) ENVELOPE(-56.750,-56.750,-64.283,-64.283) ENVELOPE(-40.000,-40.000,-82.167,-82.167) |
geographic |
Belgrano Marambio Ushuaia |
geographic_facet |
Belgrano Marambio Ushuaia |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Atmospheric Chemistry and Physics, Vol 17, Pp 13373-13389 (2017) |
op_relation |
https://www.atmos-chem-phys.net/17/13373/2017/acp-17-13373-2017.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-17-13373-2017 1680-7316 1680-7324 https://doaj.org/article/bdfbc50216e444fcb0fa0ec41a7352dc |
op_doi |
https://doi.org/10.5194/acp-17-13373-2017 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
17 |
container_issue |
21 |
container_start_page |
13373 |
op_container_end_page |
13389 |
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1766256579451027456 |