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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ftdoajarticles:oai:doaj.org/article:85df99486a26482092e088b419c10cf5 2023-05-15T14:41:21+02:00 Denitrification, dehydration and ozone loss during the 2015/2016 Arctic winter F. Khosrawi O. Kirner B.-M. Sinnhuber S. Johansson M. Höpfner M. L. Santee L. Froidevaux J. Ungermann R. Ruhnke W. Woiwode H. Oelhaf P. Braesicke 2017-11-01T00:00:00Z https://doi.org/10.5194/acp-17-12893-2017 https://doaj.org/article/85df99486a26482092e088b419c10cf5 EN eng Copernicus Publications https://www.atmos-chem-phys.net/17/12893/2017/acp-17-12893-2017.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-17-12893-2017 1680-7316 1680-7324 https://doaj.org/article/85df99486a26482092e088b419c10cf5 Atmospheric Chemistry and Physics, Vol 17, Pp 12893-12910 (2017) Physics QC1-999 Chemistry QD1-999 article 2017 ftdoajarticles https://doi.org/10.5194/acp-17-12893-2017 2022-12-31T14:41:52Z 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 O 3 loss of ∼ 2 ppmv or 117 DU in terms of column ozone in ... Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Atmospheric Chemistry and Physics 17 21 12893 12910 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 F. Khosrawi O. Kirner B.-M. Sinnhuber S. Johansson M. Höpfner M. L. Santee L. Froidevaux J. Ungermann R. Ruhnke W. Woiwode H. Oelhaf P. Braesicke Denitrification, dehydration and ozone loss during the 2015/2016 Arctic winter |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
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 O 3 loss of ∼ 2 ppmv or 117 DU in terms of column ozone in ... |
format |
Article in Journal/Newspaper |
author |
F. Khosrawi O. Kirner B.-M. Sinnhuber S. Johansson M. Höpfner M. L. Santee L. Froidevaux J. Ungermann R. Ruhnke W. Woiwode H. Oelhaf P. Braesicke |
author_facet |
F. Khosrawi O. Kirner B.-M. Sinnhuber S. Johansson M. Höpfner M. L. Santee L. Froidevaux J. Ungermann R. Ruhnke W. Woiwode H. Oelhaf P. Braesicke |
author_sort |
F. Khosrawi |
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://doaj.org/article/85df99486a26482092e088b419c10cf5 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Atmospheric Chemistry and Physics, Vol 17, Pp 12893-12910 (2017) |
op_relation |
https://www.atmos-chem-phys.net/17/12893/2017/acp-17-12893-2017.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-17-12893-2017 1680-7316 1680-7324 https://doaj.org/article/85df99486a26482092e088b419c10cf5 |
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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1766313147849768960 |