Hemispheric ozone variability indices derived from satellite observations and comparison to a coupled chemistry-climate model
Total column ozone is used to trace the dynamics of the lower and middle stratosphere which is governed by planetary waves. In order to analyse the planetary wave activity a Harmonic Analysis is applied to global multi-year total ozone observations from the Total Ozone Monitoring Spectrometer (TOMS)...
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ftdoajarticles:oai:doaj.org/article:d622051b269b4ff9aa1d193fce99a5a3 2023-05-15T13:59:59+02:00 Hemispheric ozone variability indices derived from satellite observations and comparison to a coupled chemistry-climate model T. Erbertseder V. Eyring M. Bittner M. Dameris V. Grewe 2006-01-01T00:00:00Z https://doaj.org/article/d622051b269b4ff9aa1d193fce99a5a3 EN eng Copernicus Publications http://www.atmos-chem-phys.net/6/5105/2006/acp-6-5105-2006.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/d622051b269b4ff9aa1d193fce99a5a3 Atmospheric Chemistry and Physics, Vol 6, Iss 12, Pp 5105-5120 (2006) Physics QC1-999 Chemistry QD1-999 article 2006 ftdoajarticles 2022-12-31T03:13:25Z Total column ozone is used to trace the dynamics of the lower and middle stratosphere which is governed by planetary waves. In order to analyse the planetary wave activity a Harmonic Analysis is applied to global multi-year total ozone observations from the Total Ozone Monitoring Spectrometer (TOMS). As diagnostic variables we introduce the hemispheric ozone variability indices one and two. They are defined as the hemispheric means of the amplitudes of the zonal waves number one and two, respectively, as traced by the total ozone field. The application of these indices as a simple diagnostic for the evaluation of coupled chemistry-climate models (CCMs) is demonstrated by comparing results of the CCM ECHAM4.L39(DLR)/CHEM (hereafter: E39/C) against satellite observations. It is quantified to what extent a multi-year model simulation of E39/C (representing "2000" climate conditions) is able to reproduce the zonal and hemispheric planetary wave activity derived from TOMS data (1996–2004, Version 8). Compared to the reference observations the hemispheric ozone variability indices one and two of E39/C are too high in the Northern Hemisphere and too low in the Southern Hemisphere. In the Northern Hemisphere, where the agreement is generally better, E39/C produces too strong a planetary wave one activity in winter and spring and too high an interannual variability. For the Southern Hemisphere we reveal that the indices from observations and model differ significantly during the ozone hole season. The indices are used to give reasons for the late formation of the Antarctic ozone hole, the insufficient vortex elongation and eventually the delayed final warming in E39/C. In general, the hemispheric ozone variability indices can be regarded as a simple and robust diagnostic to quantify model-observation differences concerning planetary wave activity. It allows a first-guess on how the dynamics is represented in a model simulation before applying costly and more specific diagnostics. Article in Journal/Newspaper Antarc* Antarctic Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic |
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Directory of Open Access Journals: DOAJ Articles |
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language |
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topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 T. Erbertseder V. Eyring M. Bittner M. Dameris V. Grewe Hemispheric ozone variability indices derived from satellite observations and comparison to a coupled chemistry-climate model |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Total column ozone is used to trace the dynamics of the lower and middle stratosphere which is governed by planetary waves. In order to analyse the planetary wave activity a Harmonic Analysis is applied to global multi-year total ozone observations from the Total Ozone Monitoring Spectrometer (TOMS). As diagnostic variables we introduce the hemispheric ozone variability indices one and two. They are defined as the hemispheric means of the amplitudes of the zonal waves number one and two, respectively, as traced by the total ozone field. The application of these indices as a simple diagnostic for the evaluation of coupled chemistry-climate models (CCMs) is demonstrated by comparing results of the CCM ECHAM4.L39(DLR)/CHEM (hereafter: E39/C) against satellite observations. It is quantified to what extent a multi-year model simulation of E39/C (representing "2000" climate conditions) is able to reproduce the zonal and hemispheric planetary wave activity derived from TOMS data (1996–2004, Version 8). Compared to the reference observations the hemispheric ozone variability indices one and two of E39/C are too high in the Northern Hemisphere and too low in the Southern Hemisphere. In the Northern Hemisphere, where the agreement is generally better, E39/C produces too strong a planetary wave one activity in winter and spring and too high an interannual variability. For the Southern Hemisphere we reveal that the indices from observations and model differ significantly during the ozone hole season. The indices are used to give reasons for the late formation of the Antarctic ozone hole, the insufficient vortex elongation and eventually the delayed final warming in E39/C. In general, the hemispheric ozone variability indices can be regarded as a simple and robust diagnostic to quantify model-observation differences concerning planetary wave activity. It allows a first-guess on how the dynamics is represented in a model simulation before applying costly and more specific diagnostics. |
format |
Article in Journal/Newspaper |
author |
T. Erbertseder V. Eyring M. Bittner M. Dameris V. Grewe |
author_facet |
T. Erbertseder V. Eyring M. Bittner M. Dameris V. Grewe |
author_sort |
T. Erbertseder |
title |
Hemispheric ozone variability indices derived from satellite observations and comparison to a coupled chemistry-climate model |
title_short |
Hemispheric ozone variability indices derived from satellite observations and comparison to a coupled chemistry-climate model |
title_full |
Hemispheric ozone variability indices derived from satellite observations and comparison to a coupled chemistry-climate model |
title_fullStr |
Hemispheric ozone variability indices derived from satellite observations and comparison to a coupled chemistry-climate model |
title_full_unstemmed |
Hemispheric ozone variability indices derived from satellite observations and comparison to a coupled chemistry-climate model |
title_sort |
hemispheric ozone variability indices derived from satellite observations and comparison to a coupled chemistry-climate model |
publisher |
Copernicus Publications |
publishDate |
2006 |
url |
https://doaj.org/article/d622051b269b4ff9aa1d193fce99a5a3 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Atmospheric Chemistry and Physics, Vol 6, Iss 12, Pp 5105-5120 (2006) |
op_relation |
http://www.atmos-chem-phys.net/6/5105/2006/acp-6-5105-2006.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/d622051b269b4ff9aa1d193fce99a5a3 |
_version_ |
1766268912356294656 |