Sensitivity of tracer transport to model resolution, forcing data and tracer lifetime in the general circulation model ECHAM5
International audience The transport of tracers in the general circulation model ECHAM5 is analysed using 9 independent idealized tracers with constant lifetimes released in different altitude regions of the atmosphere. The source regions were split into the tropics, Northern and Southern Hemisphere...
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ftccsdartic:oai:HAL:hal-00303227v1 2023-11-12T04:26:03+01:00 Sensitivity of tracer transport to model resolution, forcing data and tracer lifetime in the general circulation model ECHAM5 Aghedo, A. Rast, S. Schultz, M. G. Max Planck Institute for Meteorology (MPI-M) Max-Planck-Gesellschaft ICG-2 2008-01-08 https://hal.science/hal-00303227 https://hal.science/hal-00303227/document https://hal.science/hal-00303227/file/acpd-8-137-2008.pdf en eng HAL CCSD European Geosciences Union hal-00303227 https://hal.science/hal-00303227 https://hal.science/hal-00303227/document https://hal.science/hal-00303227/file/acpd-8-137-2008.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00303227 Atmospheric Chemistry and Physics Discussions, 2008, 8 (1), pp.137-160 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2008 ftccsdartic 2023-10-21T23:11:40Z International audience The transport of tracers in the general circulation model ECHAM5 is analysed using 9 independent idealized tracers with constant lifetimes released in different altitude regions of the atmosphere. The source regions were split into the tropics, Northern and Southern Hemisphere. The dependency of tracer transport on model resolution is tested in the resolutions T21L19, T42L19, T42L31, T63L31 and T106L31, by employing tracers with a globally uniform lifetime of 5 months. Each of the experiments uses prescribed sea surface temperatures and sea ice fields of the 1990s. The influence of meteorology and tracer lifetimes were tested by performing additional experiments in the T63L31 resolution, by nudging ECHAM5 towards the European Centre for Medium Range Weather Forecast 40 years re-analysis data (ERA40), and by using tracer lifetimes of 0.5 and 50 months, respectively. The transport of tracers is faster in the finer resolution models and is mostly dependent on the number of vertical levels. We found a decrease in the inter-hemispheric transport of tracers with source region at the surface or the tropopause in the coarse resolution models due to increasing recirculation within the source region and vertical mixing. However, a coarse model resolution leads to enhanced inter-hemispheric transport in the stratosphere. The use of ERA40 data only slightly affects the inter-hemispheric transport of surface and tropopause tracers, whereas it increases the inter-hemispheric and vertical transport in the stratosphere by up to 100% and by a factor of 2.5, respectively. The inter-hemispheric transport time was deduced from simulations with tracers of infinite lifetime and source regions at the surface in the Northern and Southern Hemisphere. Again, the transport was found to be faster for models with higher vertical resolution. We find inter-hemispheric transport times of about 7 to 9 months which are lower than the values reported in the literature, based for example on 85 Kr observations. Article in Journal/Newspaper Sea ice Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Aghedo, A. Rast, S. Schultz, M. G. Sensitivity of tracer transport to model resolution, forcing data and tracer lifetime in the general circulation model ECHAM5 |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience The transport of tracers in the general circulation model ECHAM5 is analysed using 9 independent idealized tracers with constant lifetimes released in different altitude regions of the atmosphere. The source regions were split into the tropics, Northern and Southern Hemisphere. The dependency of tracer transport on model resolution is tested in the resolutions T21L19, T42L19, T42L31, T63L31 and T106L31, by employing tracers with a globally uniform lifetime of 5 months. Each of the experiments uses prescribed sea surface temperatures and sea ice fields of the 1990s. The influence of meteorology and tracer lifetimes were tested by performing additional experiments in the T63L31 resolution, by nudging ECHAM5 towards the European Centre for Medium Range Weather Forecast 40 years re-analysis data (ERA40), and by using tracer lifetimes of 0.5 and 50 months, respectively. The transport of tracers is faster in the finer resolution models and is mostly dependent on the number of vertical levels. We found a decrease in the inter-hemispheric transport of tracers with source region at the surface or the tropopause in the coarse resolution models due to increasing recirculation within the source region and vertical mixing. However, a coarse model resolution leads to enhanced inter-hemispheric transport in the stratosphere. The use of ERA40 data only slightly affects the inter-hemispheric transport of surface and tropopause tracers, whereas it increases the inter-hemispheric and vertical transport in the stratosphere by up to 100% and by a factor of 2.5, respectively. The inter-hemispheric transport time was deduced from simulations with tracers of infinite lifetime and source regions at the surface in the Northern and Southern Hemisphere. Again, the transport was found to be faster for models with higher vertical resolution. We find inter-hemispheric transport times of about 7 to 9 months which are lower than the values reported in the literature, based for example on 85 Kr observations. |
author2 |
Max Planck Institute for Meteorology (MPI-M) Max-Planck-Gesellschaft ICG-2 |
format |
Article in Journal/Newspaper |
author |
Aghedo, A. Rast, S. Schultz, M. G. |
author_facet |
Aghedo, A. Rast, S. Schultz, M. G. |
author_sort |
Aghedo, A. |
title |
Sensitivity of tracer transport to model resolution, forcing data and tracer lifetime in the general circulation model ECHAM5 |
title_short |
Sensitivity of tracer transport to model resolution, forcing data and tracer lifetime in the general circulation model ECHAM5 |
title_full |
Sensitivity of tracer transport to model resolution, forcing data and tracer lifetime in the general circulation model ECHAM5 |
title_fullStr |
Sensitivity of tracer transport to model resolution, forcing data and tracer lifetime in the general circulation model ECHAM5 |
title_full_unstemmed |
Sensitivity of tracer transport to model resolution, forcing data and tracer lifetime in the general circulation model ECHAM5 |
title_sort |
sensitivity of tracer transport to model resolution, forcing data and tracer lifetime in the general circulation model echam5 |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00303227 https://hal.science/hal-00303227/document https://hal.science/hal-00303227/file/acpd-8-137-2008.pdf |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00303227 Atmospheric Chemistry and Physics Discussions, 2008, 8 (1), pp.137-160 |
op_relation |
hal-00303227 https://hal.science/hal-00303227 https://hal.science/hal-00303227/document https://hal.science/hal-00303227/file/acpd-8-137-2008.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782340191977996288 |