A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013
In Canada routine ozone soundings have been carried at Resolute Bay since 1966, making this record the longest in the world. Similar measurements started in the 1970s at three other sites, and the network was expanded in stages to 10 sites by 2003. This important record for understanding long-term c...
Published in: | Atmospheric Measurement Techniques |
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2016
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00014199 2023-05-15T15:14:48+02:00 A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013 Tarasick, D. W. Davies, J. Smit, H. G. J. Oltmans, S. J. 2016-01 electronic https://doi.org/10.5194/amt-9-195-2016 https://noa.gwlb.de/receive/cop_mods_00014199 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00014155/amt-9-195-2016.pdf https://amt.copernicus.org/articles/9/195/2016/amt-9-195-2016.pdf eng eng Copernicus Publications Atmospheric Measurement Techniques -- http://www.bibliothek.uni-regensburg.de/ezeit/?2505596 -- http://www.atmospheric-measurement-techniques.net/ -- 1867-8548 https://doi.org/10.5194/amt-9-195-2016 https://noa.gwlb.de/receive/cop_mods_00014199 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00014155/amt-9-195-2016.pdf https://amt.copernicus.org/articles/9/195/2016/amt-9-195-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/amt-9-195-2016 2022-02-08T22:55:13Z In Canada routine ozone soundings have been carried at Resolute Bay since 1966, making this record the longest in the world. Similar measurements started in the 1970s at three other sites, and the network was expanded in stages to 10 sites by 2003. This important record for understanding long-term changes in tropospheric and stratospheric ozone has been re-evaluated as part of the SPARC/IO3C/IGACO-O3/NDACC (SI2N) initiative. The Brewer–Mast sonde, used in the Canadian network until 1980, is different in construction from the electrochemical concentration cell (ECC) sonde, and the ECC sonde itself has also undergone a variety of minor design changes over the period 1980–2013. Corrections have been made for the estimated effects of these changes to produce a more homogeneous data set. The effect of the corrections is generally modest. However, the overall result is entirely positive: the comparison with co-located total ozone spectrometers is improved, in terms of both bias and standard deviation, and trends in the bias have been reduced or eliminated. An uncertainty analysis (including the additional uncertainty from the corrections, where appropriate) has also been conducted, and the altitude-dependent estimated uncertainty is included with each revised profile. The resulting time series show negative trends in the lower stratosphere of up to 5 % decade−1 for the period 1966–2013. Most of this decline occurred before 1997, and linear trends for the more recent period are generally not significant. The time series also show large variations from year to year. Some of these anomalies can be related to cold winters (in the Arctic stratosphere) or changes in the Brewer–Dobson circulation, which may thereby be influencing trends. In the troposphere, trends for the 48-year period are small and for the most part not significant. This suggests that ozone levels in the free troposphere over Canada have not changed significantly in nearly 50 years. Article in Journal/Newspaper Arctic Resolute Bay Niedersächsisches Online-Archiv NOA Arctic Canada Resolute Bay ENVELOPE(-94.842,-94.842,74.677,74.677) Atmospheric Measurement Techniques 9 1 195 214 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Tarasick, D. W. Davies, J. Smit, H. G. J. Oltmans, S. J. A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013 |
topic_facet |
article Verlagsveröffentlichung |
description |
In Canada routine ozone soundings have been carried at Resolute Bay since 1966, making this record the longest in the world. Similar measurements started in the 1970s at three other sites, and the network was expanded in stages to 10 sites by 2003. This important record for understanding long-term changes in tropospheric and stratospheric ozone has been re-evaluated as part of the SPARC/IO3C/IGACO-O3/NDACC (SI2N) initiative. The Brewer–Mast sonde, used in the Canadian network until 1980, is different in construction from the electrochemical concentration cell (ECC) sonde, and the ECC sonde itself has also undergone a variety of minor design changes over the period 1980–2013. Corrections have been made for the estimated effects of these changes to produce a more homogeneous data set. The effect of the corrections is generally modest. However, the overall result is entirely positive: the comparison with co-located total ozone spectrometers is improved, in terms of both bias and standard deviation, and trends in the bias have been reduced or eliminated. An uncertainty analysis (including the additional uncertainty from the corrections, where appropriate) has also been conducted, and the altitude-dependent estimated uncertainty is included with each revised profile. The resulting time series show negative trends in the lower stratosphere of up to 5 % decade−1 for the period 1966–2013. Most of this decline occurred before 1997, and linear trends for the more recent period are generally not significant. The time series also show large variations from year to year. Some of these anomalies can be related to cold winters (in the Arctic stratosphere) or changes in the Brewer–Dobson circulation, which may thereby be influencing trends. In the troposphere, trends for the 48-year period are small and for the most part not significant. This suggests that ozone levels in the free troposphere over Canada have not changed significantly in nearly 50 years. |
format |
Article in Journal/Newspaper |
author |
Tarasick, D. W. Davies, J. Smit, H. G. J. Oltmans, S. J. |
author_facet |
Tarasick, D. W. Davies, J. Smit, H. G. J. Oltmans, S. J. |
author_sort |
Tarasick, D. W. |
title |
A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013 |
title_short |
A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013 |
title_full |
A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013 |
title_fullStr |
A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013 |
title_full_unstemmed |
A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013 |
title_sort |
re-evaluated canadian ozonesonde record: measurements of the vertical distribution of ozone over canada from 1966 to 2013 |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/amt-9-195-2016 https://noa.gwlb.de/receive/cop_mods_00014199 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00014155/amt-9-195-2016.pdf https://amt.copernicus.org/articles/9/195/2016/amt-9-195-2016.pdf |
long_lat |
ENVELOPE(-94.842,-94.842,74.677,74.677) |
geographic |
Arctic Canada Resolute Bay |
geographic_facet |
Arctic Canada Resolute Bay |
genre |
Arctic Resolute Bay |
genre_facet |
Arctic Resolute Bay |
op_relation |
Atmospheric Measurement Techniques -- http://www.bibliothek.uni-regensburg.de/ezeit/?2505596 -- http://www.atmospheric-measurement-techniques.net/ -- 1867-8548 https://doi.org/10.5194/amt-9-195-2016 https://noa.gwlb.de/receive/cop_mods_00014199 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00014155/amt-9-195-2016.pdf https://amt.copernicus.org/articles/9/195/2016/amt-9-195-2016.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/amt-9-195-2016 |
container_title |
Atmospheric Measurement Techniques |
container_volume |
9 |
container_issue |
1 |
container_start_page |
195 |
op_container_end_page |
214 |
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1766345209121079296 |