Results of an interactively coupled atmospheric chemistry – general circulation model: Comparison with observations
The coupled climate-chemistry model ECHAM4.L39(DLR)/CHEM is presented which enables a simultaneous treatment of meteorology and atmospheric chemistry and their feedbacks. This is the first model which interactively combines a general circulation model with a chemical model, employing most of the imp...
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ftdoajarticles:oai:doaj.org/article:c56f97bda66a4a7a8b6bf4ff820a8e02 2023-05-15T13:37:55+02:00 Results of an interactively coupled atmospheric chemistry – general circulation model: Comparison with observations R. Hein M. Dameris C. Schnadt C. Land V. Grewe I. Köhler M. Ponater R. Sausen B. B. Steil J. Landgraf C. Brühl 2001-04-01T00:00:00Z https://doi.org/10.5194/angeo-19-435-2001 https://doaj.org/article/c56f97bda66a4a7a8b6bf4ff820a8e02 EN eng Copernicus Publications https://www.ann-geophys.net/19/435/2001/angeo-19-435-2001.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-19-435-2001 0992-7689 1432-0576 https://doaj.org/article/c56f97bda66a4a7a8b6bf4ff820a8e02 Annales Geophysicae, Vol 19, Pp 435-457 (2001) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2001 ftdoajarticles https://doi.org/10.5194/angeo-19-435-2001 2023-01-08T01:37:26Z The coupled climate-chemistry model ECHAM4.L39(DLR)/CHEM is presented which enables a simultaneous treatment of meteorology and atmospheric chemistry and their feedbacks. This is the first model which interactively combines a general circulation model with a chemical model, employing most of the important reactions and species necessary to describe the stratospheric and upper tropospheric ozone chemistry, and which is computationally fast enough to allow long-term integrations with currently available computer resources. This is possible as the model time-step used for the chemistry can be chosen as large as the integration time-step for the dynamics. Vertically the atmosphere is discretized by 39 levels from the surface up to the top layer which is centred at 10 hPa, with a relatively high vertical resolution of approximately 700 m near the extra-tropical tropopause. We present the results of a control simulation representing recent conditions (1990) and compare it to available observations. The focus is on investigations of stratospheric dynamics and chemistry relevant to describe the stratospheric ozone layer. ECHAM4.L39(DLR)/CHEM reproduces main features of stratospheric dynamics in the arctic vortex region, including stratospheric warming events. This constitutes a major improvement compared to earlier model versions. However, apparent shortcomings in Antarctic circulation and temperatures persist. The seasonal and interannual variability of the ozone layer is simulated in accordance with observations. Activation and deactivation of chlorine in the polar stratospheric vortices and their inter-hemispheric differences are reproduced. Considering methane oxidation as part of the dynamic-chemistry feedback results in an improved representation of the spatial distribution of stratospheric water vapour concentrations. The current model constitutes a powerful tool to investigate, for instance, the combined direct and indirect effects of anthropogenic trace gas emissions. Key words. Atmospheric composition and ... Article in Journal/Newspaper Antarc* Antarctic Arctic Directory of Open Access Journals: DOAJ Articles Antarctic Arctic Annales Geophysicae 19 4 435 457 |
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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 |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 R. Hein M. Dameris C. Schnadt C. Land V. Grewe I. Köhler M. Ponater R. Sausen B. B. Steil J. Landgraf C. Brühl Results of an interactively coupled atmospheric chemistry – general circulation model: Comparison with observations |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
The coupled climate-chemistry model ECHAM4.L39(DLR)/CHEM is presented which enables a simultaneous treatment of meteorology and atmospheric chemistry and their feedbacks. This is the first model which interactively combines a general circulation model with a chemical model, employing most of the important reactions and species necessary to describe the stratospheric and upper tropospheric ozone chemistry, and which is computationally fast enough to allow long-term integrations with currently available computer resources. This is possible as the model time-step used for the chemistry can be chosen as large as the integration time-step for the dynamics. Vertically the atmosphere is discretized by 39 levels from the surface up to the top layer which is centred at 10 hPa, with a relatively high vertical resolution of approximately 700 m near the extra-tropical tropopause. We present the results of a control simulation representing recent conditions (1990) and compare it to available observations. The focus is on investigations of stratospheric dynamics and chemistry relevant to describe the stratospheric ozone layer. ECHAM4.L39(DLR)/CHEM reproduces main features of stratospheric dynamics in the arctic vortex region, including stratospheric warming events. This constitutes a major improvement compared to earlier model versions. However, apparent shortcomings in Antarctic circulation and temperatures persist. The seasonal and interannual variability of the ozone layer is simulated in accordance with observations. Activation and deactivation of chlorine in the polar stratospheric vortices and their inter-hemispheric differences are reproduced. Considering methane oxidation as part of the dynamic-chemistry feedback results in an improved representation of the spatial distribution of stratospheric water vapour concentrations. The current model constitutes a powerful tool to investigate, for instance, the combined direct and indirect effects of anthropogenic trace gas emissions. Key words. Atmospheric composition and ... |
format |
Article in Journal/Newspaper |
author |
R. Hein M. Dameris C. Schnadt C. Land V. Grewe I. Köhler M. Ponater R. Sausen B. B. Steil J. Landgraf C. Brühl |
author_facet |
R. Hein M. Dameris C. Schnadt C. Land V. Grewe I. Köhler M. Ponater R. Sausen B. B. Steil J. Landgraf C. Brühl |
author_sort |
R. Hein |
title |
Results of an interactively coupled atmospheric chemistry – general circulation model: Comparison with observations |
title_short |
Results of an interactively coupled atmospheric chemistry – general circulation model: Comparison with observations |
title_full |
Results of an interactively coupled atmospheric chemistry – general circulation model: Comparison with observations |
title_fullStr |
Results of an interactively coupled atmospheric chemistry – general circulation model: Comparison with observations |
title_full_unstemmed |
Results of an interactively coupled atmospheric chemistry – general circulation model: Comparison with observations |
title_sort |
results of an interactively coupled atmospheric chemistry – general circulation model: comparison with observations |
publisher |
Copernicus Publications |
publishDate |
2001 |
url |
https://doi.org/10.5194/angeo-19-435-2001 https://doaj.org/article/c56f97bda66a4a7a8b6bf4ff820a8e02 |
geographic |
Antarctic Arctic |
geographic_facet |
Antarctic Arctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
Annales Geophysicae, Vol 19, Pp 435-457 (2001) |
op_relation |
https://www.ann-geophys.net/19/435/2001/angeo-19-435-2001.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-19-435-2001 0992-7689 1432-0576 https://doaj.org/article/c56f97bda66a4a7a8b6bf4ff820a8e02 |
op_doi |
https://doi.org/10.5194/angeo-19-435-2001 |
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Annales Geophysicae |
container_volume |
19 |
container_issue |
4 |
container_start_page |
435 |
op_container_end_page |
457 |
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1766099459378249728 |