Implementation issues in chemistry and transport models
International audience Offline chemistry and transport models (CTMs) are versatile tools for studying composition and climate issues requiring multi-decadal simulations. They are computationally fast compared to coupled chemistry climate models, making them well-suited for integrating sensitivity ex...
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ftinsu:oai:HAL:hal-00301863v1 2023-11-12T04:04:14+01:00 Implementation issues in chemistry and transport models Strahan, S. E. Polansky, B. C. University of Maryland College Park University of Maryland System Science Systems and Applications, Inc. Lanham (SSAI) 2005-10-21 https://hal.science/hal-00301863 https://hal.science/hal-00301863/document https://hal.science/hal-00301863/file/acpd-5-10217-2005.pdf en eng HAL CCSD European Geosciences Union hal-00301863 https://hal.science/hal-00301863 https://hal.science/hal-00301863/document https://hal.science/hal-00301863/file/acpd-5-10217-2005.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00301863 Atmospheric Chemistry and Physics Discussions, 2005, 5 (5), pp.10217-10258 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2005 ftinsu 2023-10-25T16:26:50Z International audience Offline chemistry and transport models (CTMs) are versatile tools for studying composition and climate issues requiring multi-decadal simulations. They are computationally fast compared to coupled chemistry climate models, making them well-suited for integrating sensitivity experiments necessary for understanding model performance and interpreting results. The archived meteorological fields used by CTMs can be implemented with lower horizontal or vertical resolution than the original meteorological fields in order to shorten integration time, but the effects of these shortcuts on transport processes must be understood if the CTM is to have credibility. In this paper we present a series of CTM experiments, each differing from another by a single feature of the implementation. Transport effects arising from changes in resolution and model lid height are evaluated using process-oriented diagnostics that intercompare CH 4 , O 3 , and age tracer carried in the simulations. Some of the diagnostics used are derived from observations and are shown as a reality check for the model. Processes evaluated include the tropical ascent, tropical-midlatitude exchange, the poleward circulation in the upper stratosphere, and the development of the Antarctic vortex. We find that faithful representation of stratospheric transport in this CTM using Lin and Rood advection is possible with a full mesosphere, ~1 km resolution in the lower stratosphere, and relatively low vertical resolution (>4 km spacing) in the middle stratosphere and above, but lowering the lid from the upper to lower mesosphere leads to less realistic constituent distributions in the upper stratosphere. Ultimately, this affects the polar lower stratosphere, but the effects are greater for the Antarctic than the Arctic. The fidelity of lower stratospheric transport requires realistic tropical and high latitude mixing barriers which are produced at 2°×2.5°, but not lower resolution. At 2°×2.5° resolution, the CTM produces a vortex capable ... Article in Journal/Newspaper Antarc* Antarctic Arctic Institut national des sciences de l'Univers: HAL-INSU Antarctic Arctic The Antarctic |
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Institut national des sciences de l'Univers: HAL-INSU |
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English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Strahan, S. E. Polansky, B. C. Implementation issues in chemistry and transport models |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Offline chemistry and transport models (CTMs) are versatile tools for studying composition and climate issues requiring multi-decadal simulations. They are computationally fast compared to coupled chemistry climate models, making them well-suited for integrating sensitivity experiments necessary for understanding model performance and interpreting results. The archived meteorological fields used by CTMs can be implemented with lower horizontal or vertical resolution than the original meteorological fields in order to shorten integration time, but the effects of these shortcuts on transport processes must be understood if the CTM is to have credibility. In this paper we present a series of CTM experiments, each differing from another by a single feature of the implementation. Transport effects arising from changes in resolution and model lid height are evaluated using process-oriented diagnostics that intercompare CH 4 , O 3 , and age tracer carried in the simulations. Some of the diagnostics used are derived from observations and are shown as a reality check for the model. Processes evaluated include the tropical ascent, tropical-midlatitude exchange, the poleward circulation in the upper stratosphere, and the development of the Antarctic vortex. We find that faithful representation of stratospheric transport in this CTM using Lin and Rood advection is possible with a full mesosphere, ~1 km resolution in the lower stratosphere, and relatively low vertical resolution (>4 km spacing) in the middle stratosphere and above, but lowering the lid from the upper to lower mesosphere leads to less realistic constituent distributions in the upper stratosphere. Ultimately, this affects the polar lower stratosphere, but the effects are greater for the Antarctic than the Arctic. The fidelity of lower stratospheric transport requires realistic tropical and high latitude mixing barriers which are produced at 2°×2.5°, but not lower resolution. At 2°×2.5° resolution, the CTM produces a vortex capable ... |
author2 |
University of Maryland College Park University of Maryland System Science Systems and Applications, Inc. Lanham (SSAI) |
format |
Article in Journal/Newspaper |
author |
Strahan, S. E. Polansky, B. C. |
author_facet |
Strahan, S. E. Polansky, B. C. |
author_sort |
Strahan, S. E. |
title |
Implementation issues in chemistry and transport models |
title_short |
Implementation issues in chemistry and transport models |
title_full |
Implementation issues in chemistry and transport models |
title_fullStr |
Implementation issues in chemistry and transport models |
title_full_unstemmed |
Implementation issues in chemistry and transport models |
title_sort |
implementation issues in chemistry and transport models |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00301863 https://hal.science/hal-00301863/document https://hal.science/hal-00301863/file/acpd-5-10217-2005.pdf |
geographic |
Antarctic Arctic The Antarctic |
geographic_facet |
Antarctic Arctic The Antarctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00301863 Atmospheric Chemistry and Physics Discussions, 2005, 5 (5), pp.10217-10258 |
op_relation |
hal-00301863 https://hal.science/hal-00301863 https://hal.science/hal-00301863/document https://hal.science/hal-00301863/file/acpd-5-10217-2005.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782341276906029056 |