The impact of model grid zooming on tracer transport in the 1999/2000 Arctic polar vortex
We have used a 3D chemistry transport model to evaluate the transport of HF and CH 4 in the stratosphere during the Arctic winter of 1999/2000. Several model experiments were carried out with the use of a zoom algorithm to investigate the effect of different horizontal resolutions. Balloon-borne and...
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ftcopernicus:oai:publications.copernicus.org:acp3566 2023-05-15T14:57:52+02:00 The impact of model grid zooming on tracer transport in the 1999/2000 Arctic polar vortex Broek, M. M. P. Aalst, M. K. Bregman, A. Krol, M. Lelieveld, J. Toon, G. C. Garcelon, S. Hansford, G. M. Jones, R. L. Gardiner, T. D. 2018-06-28 application/pdf https://doi.org/10.5194/acp-3-1833-2003 https://www.atmos-chem-phys.net/3/1833/2003/ eng eng doi:10.5194/acp-3-1833-2003 https://www.atmos-chem-phys.net/3/1833/2003/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acp-3-1833-2003 2019-12-24T09:59:27Z We have used a 3D chemistry transport model to evaluate the transport of HF and CH 4 in the stratosphere during the Arctic winter of 1999/2000. Several model experiments were carried out with the use of a zoom algorithm to investigate the effect of different horizontal resolutions. Balloon-borne and satellite-borne observations of HF and CH 4 were used to test the model. In addition, air mass descent rates within the polar vortex were calculated and compared to observations. Outside the vortex the model results agree well with the observations, but inside the vortex the model underestimates the observed vertical gradient in HF and CH 4 , even when the highest available resolution (1º x 1º) is applied. The calculated diabatic descent rates agree with observations above potential temperature levels of 450 K. These model results suggest that too strong mixing through the vortex edge could be a plausible cause for the model discrepancies, associated with the calculated mass fluxes, although other reasons are also discussed. Based on our model experiments we conclude that a global 6º x 9º resolution is too coarse to represent the polar vortex, whereas the higher resolutions, 3º x 2º and 1º x 1º, yield similar results, even with a 6º x 9º resolution in the tropical region. Text Arctic Copernicus Publications: E-Journals Arctic Atmospheric Chemistry and Physics 3 5 1833 1847 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
We have used a 3D chemistry transport model to evaluate the transport of HF and CH 4 in the stratosphere during the Arctic winter of 1999/2000. Several model experiments were carried out with the use of a zoom algorithm to investigate the effect of different horizontal resolutions. Balloon-borne and satellite-borne observations of HF and CH 4 were used to test the model. In addition, air mass descent rates within the polar vortex were calculated and compared to observations. Outside the vortex the model results agree well with the observations, but inside the vortex the model underestimates the observed vertical gradient in HF and CH 4 , even when the highest available resolution (1º x 1º) is applied. The calculated diabatic descent rates agree with observations above potential temperature levels of 450 K. These model results suggest that too strong mixing through the vortex edge could be a plausible cause for the model discrepancies, associated with the calculated mass fluxes, although other reasons are also discussed. Based on our model experiments we conclude that a global 6º x 9º resolution is too coarse to represent the polar vortex, whereas the higher resolutions, 3º x 2º and 1º x 1º, yield similar results, even with a 6º x 9º resolution in the tropical region. |
format |
Text |
author |
Broek, M. M. P. Aalst, M. K. Bregman, A. Krol, M. Lelieveld, J. Toon, G. C. Garcelon, S. Hansford, G. M. Jones, R. L. Gardiner, T. D. |
spellingShingle |
Broek, M. M. P. Aalst, M. K. Bregman, A. Krol, M. Lelieveld, J. Toon, G. C. Garcelon, S. Hansford, G. M. Jones, R. L. Gardiner, T. D. The impact of model grid zooming on tracer transport in the 1999/2000 Arctic polar vortex |
author_facet |
Broek, M. M. P. Aalst, M. K. Bregman, A. Krol, M. Lelieveld, J. Toon, G. C. Garcelon, S. Hansford, G. M. Jones, R. L. Gardiner, T. D. |
author_sort |
Broek, M. M. P. |
title |
The impact of model grid zooming on tracer transport in the 1999/2000 Arctic polar vortex |
title_short |
The impact of model grid zooming on tracer transport in the 1999/2000 Arctic polar vortex |
title_full |
The impact of model grid zooming on tracer transport in the 1999/2000 Arctic polar vortex |
title_fullStr |
The impact of model grid zooming on tracer transport in the 1999/2000 Arctic polar vortex |
title_full_unstemmed |
The impact of model grid zooming on tracer transport in the 1999/2000 Arctic polar vortex |
title_sort |
impact of model grid zooming on tracer transport in the 1999/2000 arctic polar vortex |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-3-1833-2003 https://www.atmos-chem-phys.net/3/1833/2003/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-3-1833-2003 https://www.atmos-chem-phys.net/3/1833/2003/ |
op_doi |
https://doi.org/10.5194/acp-3-1833-2003 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
3 |
container_issue |
5 |
container_start_page |
1833 |
op_container_end_page |
1847 |
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1766329969076600832 |