Improvements to stratospheric chemistry scheme in the UM-UKCA (v10.7) model: solar cycle and heterogeneous reactions
Improvements are made to two areas of the United Kingdom Chemistry and Aerosol (UKCA) module, which forms part of the Met Office Unified Model (UM) used for weather and climate applications. Firstly, a solar cycle is added to the photolysis scheme. The effect on total column ozone of this addition w...
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Language: | English |
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Online Access: | https://doi.org/10.5194/gmd-12-1227-2019 https://gmd.copernicus.org/articles/12/1227/2019/ |
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ftcopernicus:oai:publications.copernicus.org:gmd72604 2023-05-15T13:55:28+02:00 Improvements to stratospheric chemistry scheme in the UM-UKCA (v10.7) model: solar cycle and heterogeneous reactions Dennison, Fraser Keeble, James Morgenstern, Olaf Zeng, Guang Abraham, N. Luke Yang, Xin 2019-03-29 info:eu-repo/semantics/application/pdf https://doi.org/10.5194/gmd-12-1227-2019 https://gmd.copernicus.org/articles/12/1227/2019/ eng eng info:eu-repo/grantAgreement/EC/FP7/603557 doi:10.5194/gmd-12-1227-2019 https://gmd.copernicus.org/articles/12/1227/2019/ info:eu-repo/semantics/openAccess eISSN: 1991-9603 info:eu-repo/semantics/Text 2019 ftcopernicus https://doi.org/10.5194/gmd-12-1227-2019 2020-07-20T16:22:53Z Improvements are made to two areas of the United Kingdom Chemistry and Aerosol (UKCA) module, which forms part of the Met Office Unified Model (UM) used for weather and climate applications. Firstly, a solar cycle is added to the photolysis scheme. The effect on total column ozone of this addition was found to be around 1 %–2 % in midlatitude and equatorial regions, in phase with the solar cycle. Secondly, reactions occurring on the surfaces of polar stratospheric clouds and sulfate aerosol are updated and extended by modification of the uptake coefficients of five existing reactions and the addition of a further eight reactions involving bromine species. These modifications are shown to reduce the overabundance of modelled total column ozone in the Arctic during October to February, southern midlatitudes during August and the Antarctic during September. Antarctic springtime ozone depletion is shown to be enhanced by 25 DU on average, which now causes the ozone hole to be somewhat too deep compared to observations. We show that this is in part due to a cold bias of the Antarctic polar vortex in the model. Other/Unknown Material Antarc* Antarctic Arctic Copernicus Publications: E-Journals Antarctic Arctic The Antarctic Geoscientific Model Development 12 3 1227 1239 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Improvements are made to two areas of the United Kingdom Chemistry and Aerosol (UKCA) module, which forms part of the Met Office Unified Model (UM) used for weather and climate applications. Firstly, a solar cycle is added to the photolysis scheme. The effect on total column ozone of this addition was found to be around 1 %–2 % in midlatitude and equatorial regions, in phase with the solar cycle. Secondly, reactions occurring on the surfaces of polar stratospheric clouds and sulfate aerosol are updated and extended by modification of the uptake coefficients of five existing reactions and the addition of a further eight reactions involving bromine species. These modifications are shown to reduce the overabundance of modelled total column ozone in the Arctic during October to February, southern midlatitudes during August and the Antarctic during September. Antarctic springtime ozone depletion is shown to be enhanced by 25 DU on average, which now causes the ozone hole to be somewhat too deep compared to observations. We show that this is in part due to a cold bias of the Antarctic polar vortex in the model. |
format |
Other/Unknown Material |
author |
Dennison, Fraser Keeble, James Morgenstern, Olaf Zeng, Guang Abraham, N. Luke Yang, Xin |
spellingShingle |
Dennison, Fraser Keeble, James Morgenstern, Olaf Zeng, Guang Abraham, N. Luke Yang, Xin Improvements to stratospheric chemistry scheme in the UM-UKCA (v10.7) model: solar cycle and heterogeneous reactions |
author_facet |
Dennison, Fraser Keeble, James Morgenstern, Olaf Zeng, Guang Abraham, N. Luke Yang, Xin |
author_sort |
Dennison, Fraser |
title |
Improvements to stratospheric chemistry scheme in the UM-UKCA (v10.7) model: solar cycle and heterogeneous reactions |
title_short |
Improvements to stratospheric chemistry scheme in the UM-UKCA (v10.7) model: solar cycle and heterogeneous reactions |
title_full |
Improvements to stratospheric chemistry scheme in the UM-UKCA (v10.7) model: solar cycle and heterogeneous reactions |
title_fullStr |
Improvements to stratospheric chemistry scheme in the UM-UKCA (v10.7) model: solar cycle and heterogeneous reactions |
title_full_unstemmed |
Improvements to stratospheric chemistry scheme in the UM-UKCA (v10.7) model: solar cycle and heterogeneous reactions |
title_sort |
improvements to stratospheric chemistry scheme in the um-ukca (v10.7) model: solar cycle and heterogeneous reactions |
publishDate |
2019 |
url |
https://doi.org/10.5194/gmd-12-1227-2019 https://gmd.copernicus.org/articles/12/1227/2019/ |
geographic |
Antarctic Arctic The Antarctic |
geographic_facet |
Antarctic Arctic The Antarctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
eISSN: 1991-9603 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/603557 doi:10.5194/gmd-12-1227-2019 https://gmd.copernicus.org/articles/12/1227/2019/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/gmd-12-1227-2019 |
container_title |
Geoscientific Model Development |
container_volume |
12 |
container_issue |
3 |
container_start_page |
1227 |
op_container_end_page |
1239 |
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1766262116318183424 |