Ozone trends at northern mid- and high latitudes – a European perspective
The EU CANDIDOZ project investigated the chemical and dynamical influences on decadal ozone trends focusing on the Northern Hemisphere. High quality long-term ozone data sets, satellite-based as well as ground-based, and the long-term meteorological reanalyses from ECMWF and NCEP are used together w...
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Online Access: | https://doi.org/10.5194/angeo-26-1207-2008 https://doaj.org/article/83d8951034f64c308e8287314b0b1eab |
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ftdoajarticles:oai:doaj.org/article:83d8951034f64c308e8287314b0b1eab 2023-05-15T15:01:51+02:00 Ozone trends at northern mid- and high latitudes – a European perspective N. R. P. Harris E. Kyrö J. Staehelin D. Brunner S.-B. Andersen S. Godin-Beekmann S. Dhomse P. Hadjinicolaou G. Hansen I. Isaksen A. Jrrar A. Karpetchko R. Kivi B. Knudsen P. Krizan J. Lastovicka J. Maeder Y. Orsolini J. A. Pyle M. Rex K. Vanicek M. Weber I. Wohltmann P. Zanis C. Zerefos 2008-05-01T00:00:00Z https://doi.org/10.5194/angeo-26-1207-2008 https://doaj.org/article/83d8951034f64c308e8287314b0b1eab EN eng Copernicus Publications https://www.ann-geophys.net/26/1207/2008/angeo-26-1207-2008.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-26-1207-2008 0992-7689 1432-0576 https://doaj.org/article/83d8951034f64c308e8287314b0b1eab Annales Geophysicae, Vol 26, Pp 1207-1220 (2008) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2008 ftdoajarticles https://doi.org/10.5194/angeo-26-1207-2008 2022-12-31T01:07:35Z The EU CANDIDOZ project investigated the chemical and dynamical influences on decadal ozone trends focusing on the Northern Hemisphere. High quality long-term ozone data sets, satellite-based as well as ground-based, and the long-term meteorological reanalyses from ECMWF and NCEP are used together with advanced multiple regression models and atmospheric models to assess the relative roles of chemistry and transport in stratospheric ozone changes. This overall synthesis of the individual analyses in CANDIDOZ shows clearly one common feature in the NH mid latitudes and in the Arctic: an almost monotonic negative trend from the late 1970s to the mid 1990s followed by an increase. In most trend studies, the Equivalent Effective Stratospheric Chlorine (EESC) which peaked in 1997 as a consequence of the Montreal Protocol was observed to describe ozone loss better than a simple linear trend. Furthermore, all individual analyses point to changes in dynamical drivers, such as the residual circulation (responsible for the meridional transport of ozone into middle and high latitudes) playing a key role in the observed turnaround. The changes in ozone transport are associated with variations in polar chemical ozone loss via heterogeneous ozone chemistry on PSCs (polar stratospheric clouds). Synoptic scale processes as represented by the new equivalent latitude proxy, by conventional tropopause altitude or by 250 hPa geopotential height have also been successfully linked to the recent ozone increases in the lowermost stratosphere. These show significant regional variation with a large impact over Europe and seem to be linked to changes in tropospheric climate patterns such as the North Atlantic Oscillation. Some influence in recent ozone increases was also attributed to the rise in solar cycle number 23. Changes from the late 1970s to the mid 1990s were found in a number of characteristics of the Arctic vortex. However, only one trend was found when more recent years are also considered, namely the tendency for cold winters ... Article in Journal/Newspaper Arctic North Atlantic North Atlantic oscillation Directory of Open Access Journals: DOAJ Articles Arctic Annales Geophysicae 26 5 1207 1220 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 N. R. P. Harris E. Kyrö J. Staehelin D. Brunner S.-B. Andersen S. Godin-Beekmann S. Dhomse P. Hadjinicolaou G. Hansen I. Isaksen A. Jrrar A. Karpetchko R. Kivi B. Knudsen P. Krizan J. Lastovicka J. Maeder Y. Orsolini J. A. Pyle M. Rex K. Vanicek M. Weber I. Wohltmann P. Zanis C. Zerefos Ozone trends at northern mid- and high latitudes – a European perspective |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
The EU CANDIDOZ project investigated the chemical and dynamical influences on decadal ozone trends focusing on the Northern Hemisphere. High quality long-term ozone data sets, satellite-based as well as ground-based, and the long-term meteorological reanalyses from ECMWF and NCEP are used together with advanced multiple regression models and atmospheric models to assess the relative roles of chemistry and transport in stratospheric ozone changes. This overall synthesis of the individual analyses in CANDIDOZ shows clearly one common feature in the NH mid latitudes and in the Arctic: an almost monotonic negative trend from the late 1970s to the mid 1990s followed by an increase. In most trend studies, the Equivalent Effective Stratospheric Chlorine (EESC) which peaked in 1997 as a consequence of the Montreal Protocol was observed to describe ozone loss better than a simple linear trend. Furthermore, all individual analyses point to changes in dynamical drivers, such as the residual circulation (responsible for the meridional transport of ozone into middle and high latitudes) playing a key role in the observed turnaround. The changes in ozone transport are associated with variations in polar chemical ozone loss via heterogeneous ozone chemistry on PSCs (polar stratospheric clouds). Synoptic scale processes as represented by the new equivalent latitude proxy, by conventional tropopause altitude or by 250 hPa geopotential height have also been successfully linked to the recent ozone increases in the lowermost stratosphere. These show significant regional variation with a large impact over Europe and seem to be linked to changes in tropospheric climate patterns such as the North Atlantic Oscillation. Some influence in recent ozone increases was also attributed to the rise in solar cycle number 23. Changes from the late 1970s to the mid 1990s were found in a number of characteristics of the Arctic vortex. However, only one trend was found when more recent years are also considered, namely the tendency for cold winters ... |
format |
Article in Journal/Newspaper |
author |
N. R. P. Harris E. Kyrö J. Staehelin D. Brunner S.-B. Andersen S. Godin-Beekmann S. Dhomse P. Hadjinicolaou G. Hansen I. Isaksen A. Jrrar A. Karpetchko R. Kivi B. Knudsen P. Krizan J. Lastovicka J. Maeder Y. Orsolini J. A. Pyle M. Rex K. Vanicek M. Weber I. Wohltmann P. Zanis C. Zerefos |
author_facet |
N. R. P. Harris E. Kyrö J. Staehelin D. Brunner S.-B. Andersen S. Godin-Beekmann S. Dhomse P. Hadjinicolaou G. Hansen I. Isaksen A. Jrrar A. Karpetchko R. Kivi B. Knudsen P. Krizan J. Lastovicka J. Maeder Y. Orsolini J. A. Pyle M. Rex K. Vanicek M. Weber I. Wohltmann P. Zanis C. Zerefos |
author_sort |
N. R. P. Harris |
title |
Ozone trends at northern mid- and high latitudes – a European perspective |
title_short |
Ozone trends at northern mid- and high latitudes – a European perspective |
title_full |
Ozone trends at northern mid- and high latitudes – a European perspective |
title_fullStr |
Ozone trends at northern mid- and high latitudes – a European perspective |
title_full_unstemmed |
Ozone trends at northern mid- and high latitudes – a European perspective |
title_sort |
ozone trends at northern mid- and high latitudes – a european perspective |
publisher |
Copernicus Publications |
publishDate |
2008 |
url |
https://doi.org/10.5194/angeo-26-1207-2008 https://doaj.org/article/83d8951034f64c308e8287314b0b1eab |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic North Atlantic North Atlantic oscillation |
genre_facet |
Arctic North Atlantic North Atlantic oscillation |
op_source |
Annales Geophysicae, Vol 26, Pp 1207-1220 (2008) |
op_relation |
https://www.ann-geophys.net/26/1207/2008/angeo-26-1207-2008.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-26-1207-2008 0992-7689 1432-0576 https://doaj.org/article/83d8951034f64c308e8287314b0b1eab |
op_doi |
https://doi.org/10.5194/angeo-26-1207-2008 |
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Annales Geophysicae |
container_volume |
26 |
container_issue |
5 |
container_start_page |
1207 |
op_container_end_page |
1220 |
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