Key aspects of stratospheric tracer modeling
International audience This study describes key aspects of global chemistry-transport models and the impact on stratospheric tracer transport. We concentrate on global models that use assimilated winds from numerical weather predictions, but the results also apply to tracer transport in general circ...
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ftinsu:oai:HAL:hal-00301342v1 2023-11-12T04:12:36+01:00 Key aspects of stratospheric tracer modeling Bregman, B. Meijer, E. Scheele, R. Royal Netherlands Meteorological Institute (KNMI) 2006-06-06 https://hal.science/hal-00301342 https://hal.science/hal-00301342/document https://hal.science/hal-00301342/file/acpd-6-4375-2006.pdf en eng HAL CCSD European Geosciences Union hal-00301342 https://hal.science/hal-00301342 https://hal.science/hal-00301342/document https://hal.science/hal-00301342/file/acpd-6-4375-2006.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00301342 Atmospheric Chemistry and Physics Discussions, 2006, 6 (3), pp.4375-4414 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2006 ftinsu 2023-10-25T16:27:04Z International audience This study describes key aspects of global chemistry-transport models and the impact on stratospheric tracer transport. We concentrate on global models that use assimilated winds from numerical weather predictions, but the results also apply to tracer transport in general circulation models. We examined grid resolution, numerical diffusion and dispersion of the winds fields, the meteorology update time intervals, update frequency, and time interpolation. For this study we applied the three-dimensional chemistry-transport Tracer Model version 5 (TM5) and a trajectory model and performed several diagnoses focusing on different transport regimes. Covering different time and spatial scales, we examined (1) polar vortex dynamics during the Arctic winter, (2) the large-scale stratospheric meridional circulation, and (3) air parcel dispersion in the tropical lower stratosphere. Tracer distributions inside the Arctic polar vortex show considerably worse agreement with observations when the model grid resolution in the polar region is reduced to avoid numerical instability. Using time interpolated winds improve the tracer distributions only marginally. Considerable improvement is found when the update frequency of the assimilated winds is increased from 6 to 3h, both in the large-scale tracer distribution and the polar regions. It further reduces in particular the vertical dispersion of air parcels in the tropical lower stratosphere. The results in this study demonstrates significant progress in the use of assimilated meteorology in chemistry-transport models, which is important for both short- and long-term integrations. Article in Journal/Newspaper Arctic Institut national des sciences de l'Univers: HAL-INSU Arctic |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
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ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Bregman, B. Meijer, E. Scheele, R. Key aspects of stratospheric tracer modeling |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience This study describes key aspects of global chemistry-transport models and the impact on stratospheric tracer transport. We concentrate on global models that use assimilated winds from numerical weather predictions, but the results also apply to tracer transport in general circulation models. We examined grid resolution, numerical diffusion and dispersion of the winds fields, the meteorology update time intervals, update frequency, and time interpolation. For this study we applied the three-dimensional chemistry-transport Tracer Model version 5 (TM5) and a trajectory model and performed several diagnoses focusing on different transport regimes. Covering different time and spatial scales, we examined (1) polar vortex dynamics during the Arctic winter, (2) the large-scale stratospheric meridional circulation, and (3) air parcel dispersion in the tropical lower stratosphere. Tracer distributions inside the Arctic polar vortex show considerably worse agreement with observations when the model grid resolution in the polar region is reduced to avoid numerical instability. Using time interpolated winds improve the tracer distributions only marginally. Considerable improvement is found when the update frequency of the assimilated winds is increased from 6 to 3h, both in the large-scale tracer distribution and the polar regions. It further reduces in particular the vertical dispersion of air parcels in the tropical lower stratosphere. The results in this study demonstrates significant progress in the use of assimilated meteorology in chemistry-transport models, which is important for both short- and long-term integrations. |
author2 |
Royal Netherlands Meteorological Institute (KNMI) |
format |
Article in Journal/Newspaper |
author |
Bregman, B. Meijer, E. Scheele, R. |
author_facet |
Bregman, B. Meijer, E. Scheele, R. |
author_sort |
Bregman, B. |
title |
Key aspects of stratospheric tracer modeling |
title_short |
Key aspects of stratospheric tracer modeling |
title_full |
Key aspects of stratospheric tracer modeling |
title_fullStr |
Key aspects of stratospheric tracer modeling |
title_full_unstemmed |
Key aspects of stratospheric tracer modeling |
title_sort |
key aspects of stratospheric tracer modeling |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00301342 https://hal.science/hal-00301342/document https://hal.science/hal-00301342/file/acpd-6-4375-2006.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00301342 Atmospheric Chemistry and Physics Discussions, 2006, 6 (3), pp.4375-4414 |
op_relation |
hal-00301342 https://hal.science/hal-00301342 https://hal.science/hal-00301342/document https://hal.science/hal-00301342/file/acpd-6-4375-2006.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782331039134253056 |