Denitrification, dehydration and ozone loss during the 2015/2016 Arctic winter
The 2015/2016 Arctic winter was one of the coldest stratospheric winters in recent years. A stable vortex formed by early December and the early winter was exceptionally cold. Cold pool temperatures dropped below the nitric acid trihydrate (NAT) existence temperature of about 195 K, thus allowing po...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00042139 2023-05-15T14:42:46+02:00 Denitrification, dehydration and ozone loss during the 2015/2016 Arctic winter Khosrawi, Farahnaz Kirner, Oliver Sinnhuber, Björn-Martin Johansson, Sören Höpfner, Michael Santee, Michelle L. Froidevaux, Lucien Ungermann, Jörn Ruhnke, Roland Woiwode, Wolfgang Oelhaf, Hermann Braesicke, Peter 2017-11 electronic https://doi.org/10.5194/acp-17-12893-2017 https://noa.gwlb.de/receive/cop_mods_00042139 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041759/acp-17-12893-2017.pdf https://acp.copernicus.org/articles/17/12893/2017/acp-17-12893-2017.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-17-12893-2017 https://noa.gwlb.de/receive/cop_mods_00042139 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041759/acp-17-12893-2017.pdf https://acp.copernicus.org/articles/17/12893/2017/acp-17-12893-2017.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2017 ftnonlinearchiv https://doi.org/10.5194/acp-17-12893-2017 2022-02-08T22:41:12Z The 2015/2016 Arctic winter was one of the coldest stratospheric winters in recent years. A stable vortex formed by early December and the early winter was exceptionally cold. Cold pool temperatures dropped below the nitric acid trihydrate (NAT) existence temperature of about 195 K, thus allowing polar stratospheric clouds (PSCs) to form. The low temperatures in the polar stratosphere persisted until early March, allowing chlorine activation and catalytic ozone destruction. Satellite observations indicate that sedimentation of PSC particles led to denitrification as well as dehydration of stratospheric layers. Model simulations of the 2015/2016 Arctic winter nudged toward European Centre for Medium-Range Weather Forecasts (ECMWF) analysis data were performed with the atmospheric chemistry–climate model ECHAM5/MESSy Atmospheric Chemistry (EMAC) for the Polar Stratosphere in a Changing Climate (POLSTRACC) campaign. POLSTRACC is a High Altitude and Long Range Research Aircraft (HALO) mission aimed at the investigation of the structure, composition and evolution of the Arctic upper troposphere and lower stratosphere (UTLS). The chemical and physical processes involved in Arctic stratospheric ozone depletion, transport and mixing processes in the UTLS at high latitudes, PSCs and cirrus clouds are investigated. In this study, an overview of the chemistry and dynamics of the 2015/2016 Arctic winter as simulated with EMAC is given. Further, chemical–dynamical processes such as denitrification, dehydration and ozone loss during the 2015/2016 Arctic winter are investigated. Comparisons to satellite observations by the Aura Microwave Limb Sounder (Aura/MLS) as well as to airborne measurements with the Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) performed aboard HALO during the POLSTRACC campaign show that the EMAC simulations nudged toward ECMWF analysis generally agree well with observations. We derive a maximum polar stratospheric O3 loss of ∼ 2 ppmv or 117 DU in terms of column ozone in mid-March. The stratosphere was denitrified by about 4–8 ppbv HNO3 and dehydrated by about 0.6–1 ppmv H2O from the middle to the end of February. While ozone loss was quite strong, but not as strong as in 2010/2011, denitrification and dehydration were so far the strongest observed in the Arctic stratosphere in at least the past 10 years. Article in Journal/Newspaper Arctic Niedersächsisches Online-Archiv NOA Arctic Atmospheric Chemistry and Physics 17 21 12893 12910 |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Khosrawi, Farahnaz Kirner, Oliver Sinnhuber, Björn-Martin Johansson, Sören Höpfner, Michael Santee, Michelle L. Froidevaux, Lucien Ungermann, Jörn Ruhnke, Roland Woiwode, Wolfgang Oelhaf, Hermann Braesicke, Peter Denitrification, dehydration and ozone loss during the 2015/2016 Arctic winter |
topic_facet |
article Verlagsveröffentlichung |
description |
The 2015/2016 Arctic winter was one of the coldest stratospheric winters in recent years. A stable vortex formed by early December and the early winter was exceptionally cold. Cold pool temperatures dropped below the nitric acid trihydrate (NAT) existence temperature of about 195 K, thus allowing polar stratospheric clouds (PSCs) to form. The low temperatures in the polar stratosphere persisted until early March, allowing chlorine activation and catalytic ozone destruction. Satellite observations indicate that sedimentation of PSC particles led to denitrification as well as dehydration of stratospheric layers. Model simulations of the 2015/2016 Arctic winter nudged toward European Centre for Medium-Range Weather Forecasts (ECMWF) analysis data were performed with the atmospheric chemistry–climate model ECHAM5/MESSy Atmospheric Chemistry (EMAC) for the Polar Stratosphere in a Changing Climate (POLSTRACC) campaign. POLSTRACC is a High Altitude and Long Range Research Aircraft (HALO) mission aimed at the investigation of the structure, composition and evolution of the Arctic upper troposphere and lower stratosphere (UTLS). The chemical and physical processes involved in Arctic stratospheric ozone depletion, transport and mixing processes in the UTLS at high latitudes, PSCs and cirrus clouds are investigated. In this study, an overview of the chemistry and dynamics of the 2015/2016 Arctic winter as simulated with EMAC is given. Further, chemical–dynamical processes such as denitrification, dehydration and ozone loss during the 2015/2016 Arctic winter are investigated. Comparisons to satellite observations by the Aura Microwave Limb Sounder (Aura/MLS) as well as to airborne measurements with the Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) performed aboard HALO during the POLSTRACC campaign show that the EMAC simulations nudged toward ECMWF analysis generally agree well with observations. We derive a maximum polar stratospheric O3 loss of ∼ 2 ppmv or 117 DU in terms of column ozone in mid-March. The stratosphere was denitrified by about 4–8 ppbv HNO3 and dehydrated by about 0.6–1 ppmv H2O from the middle to the end of February. While ozone loss was quite strong, but not as strong as in 2010/2011, denitrification and dehydration were so far the strongest observed in the Arctic stratosphere in at least the past 10 years. |
format |
Article in Journal/Newspaper |
author |
Khosrawi, Farahnaz Kirner, Oliver Sinnhuber, Björn-Martin Johansson, Sören Höpfner, Michael Santee, Michelle L. Froidevaux, Lucien Ungermann, Jörn Ruhnke, Roland Woiwode, Wolfgang Oelhaf, Hermann Braesicke, Peter |
author_facet |
Khosrawi, Farahnaz Kirner, Oliver Sinnhuber, Björn-Martin Johansson, Sören Höpfner, Michael Santee, Michelle L. Froidevaux, Lucien Ungermann, Jörn Ruhnke, Roland Woiwode, Wolfgang Oelhaf, Hermann Braesicke, Peter |
author_sort |
Khosrawi, Farahnaz |
title |
Denitrification, dehydration and ozone loss during the 2015/2016 Arctic winter |
title_short |
Denitrification, dehydration and ozone loss during the 2015/2016 Arctic winter |
title_full |
Denitrification, dehydration and ozone loss during the 2015/2016 Arctic winter |
title_fullStr |
Denitrification, dehydration and ozone loss during the 2015/2016 Arctic winter |
title_full_unstemmed |
Denitrification, dehydration and ozone loss during the 2015/2016 Arctic winter |
title_sort |
denitrification, dehydration and ozone loss during the 2015/2016 arctic winter |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/acp-17-12893-2017 https://noa.gwlb.de/receive/cop_mods_00042139 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041759/acp-17-12893-2017.pdf https://acp.copernicus.org/articles/17/12893/2017/acp-17-12893-2017.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-17-12893-2017 https://noa.gwlb.de/receive/cop_mods_00042139 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00041759/acp-17-12893-2017.pdf https://acp.copernicus.org/articles/17/12893/2017/acp-17-12893-2017.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-17-12893-2017 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
17 |
container_issue |
21 |
container_start_page |
12893 |
op_container_end_page |
12910 |
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1766314494249664512 |