Stratospheric temperatures and tracer transport in a nudged 4-year middle atmosphere GCM simulation
International audience We have performed a 4-year simulation with the Middle Atmosphere General Circulation Model MAECHAM5/MESSy, while slightly nudging the model's meteorology in the free troposphere (below 113 hPa) towards ECMWF analyses. We show that the nudging 5 technique, which leaves the...
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ftccsdartic:oai:HAL:hal-00301035v1 2023-12-03T10:13:53+01:00 Stratospheric temperatures and tracer transport in a nudged 4-year middle atmosphere GCM simulation van Aalst, M. K. Lelieveld, J. Steil, B. Brühl, C. Jöckel, P. Giorgetta, M. A. Roelofs, G.-J. Institute for Marine and Atmospheric Research Utrecht (IMAU) Universiteit Utrecht / Utrecht University Utrecht Max Planck Institute for Chemistry (MPIC) Max-Planck-Gesellschaft Max Planck Institute for Meteorology (MPI-M) 2005-02-21 https://hal.science/hal-00301035 https://hal.science/hal-00301035/document https://hal.science/hal-00301035/file/acpd-5-961-2005.pdf en eng HAL CCSD European Geosciences Union hal-00301035 https://hal.science/hal-00301035 https://hal.science/hal-00301035/document https://hal.science/hal-00301035/file/acpd-5-961-2005.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00301035 Atmospheric Chemistry and Physics Discussions, 2005, 5 (1), pp.961-1006 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2005 ftccsdartic 2023-11-04T23:55:13Z International audience We have performed a 4-year simulation with the Middle Atmosphere General Circulation Model MAECHAM5/MESSy, while slightly nudging the model's meteorology in the free troposphere (below 113 hPa) towards ECMWF analyses. We show that the nudging 5 technique, which leaves the middle atmosphere almost entirely free, enables comparisons with synoptic observations. The model successfully reproduces many specific features of the interannual variability, including details of the Antarctic vortex structure. In the Arctic, the model captures general features of the interannual variability, but falls short in reproducing the timing of sudden stratospheric warmings. A 10 detailed comparison of the nudged model simulations with ECMWF data shows that the model simulates realistic stratospheric temperature distributions and variabilities, including the temperature minima in the Antarctic vortex. Some small (a few K) model biases were also identified, including a summer cold bias at both poles, and a general cold bias in the lower stratosphere, most pronounced in midlatitudes. A comparison 15 of tracer distributions with HALOE observations shows that the model successfully reproduces specific aspects of the instantaneous circulation. The main tracer transport deficiencies occur in the polar lowermost stratosphere. These are related to the tropopause altitude as well as the tracer advection scheme and model resolution. The additional nudging of equatorial zonal winds, forcing the quasi-biennial oscillation, sig20 nificantly improves stratospheric temperatures and tracer distributions. Article in Journal/Newspaper Antarc* Antarctic Arctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Antarctic The Antarctic |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere van Aalst, M. K. Lelieveld, J. Steil, B. Brühl, C. Jöckel, P. Giorgetta, M. A. Roelofs, G.-J. Stratospheric temperatures and tracer transport in a nudged 4-year middle atmosphere GCM simulation |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience We have performed a 4-year simulation with the Middle Atmosphere General Circulation Model MAECHAM5/MESSy, while slightly nudging the model's meteorology in the free troposphere (below 113 hPa) towards ECMWF analyses. We show that the nudging 5 technique, which leaves the middle atmosphere almost entirely free, enables comparisons with synoptic observations. The model successfully reproduces many specific features of the interannual variability, including details of the Antarctic vortex structure. In the Arctic, the model captures general features of the interannual variability, but falls short in reproducing the timing of sudden stratospheric warmings. A 10 detailed comparison of the nudged model simulations with ECMWF data shows that the model simulates realistic stratospheric temperature distributions and variabilities, including the temperature minima in the Antarctic vortex. Some small (a few K) model biases were also identified, including a summer cold bias at both poles, and a general cold bias in the lower stratosphere, most pronounced in midlatitudes. A comparison 15 of tracer distributions with HALOE observations shows that the model successfully reproduces specific aspects of the instantaneous circulation. The main tracer transport deficiencies occur in the polar lowermost stratosphere. These are related to the tropopause altitude as well as the tracer advection scheme and model resolution. The additional nudging of equatorial zonal winds, forcing the quasi-biennial oscillation, sig20 nificantly improves stratospheric temperatures and tracer distributions. |
author2 |
Institute for Marine and Atmospheric Research Utrecht (IMAU) Universiteit Utrecht / Utrecht University Utrecht Max Planck Institute for Chemistry (MPIC) Max-Planck-Gesellschaft Max Planck Institute for Meteorology (MPI-M) |
format |
Article in Journal/Newspaper |
author |
van Aalst, M. K. Lelieveld, J. Steil, B. Brühl, C. Jöckel, P. Giorgetta, M. A. Roelofs, G.-J. |
author_facet |
van Aalst, M. K. Lelieveld, J. Steil, B. Brühl, C. Jöckel, P. Giorgetta, M. A. Roelofs, G.-J. |
author_sort |
van Aalst, M. K. |
title |
Stratospheric temperatures and tracer transport in a nudged 4-year middle atmosphere GCM simulation |
title_short |
Stratospheric temperatures and tracer transport in a nudged 4-year middle atmosphere GCM simulation |
title_full |
Stratospheric temperatures and tracer transport in a nudged 4-year middle atmosphere GCM simulation |
title_fullStr |
Stratospheric temperatures and tracer transport in a nudged 4-year middle atmosphere GCM simulation |
title_full_unstemmed |
Stratospheric temperatures and tracer transport in a nudged 4-year middle atmosphere GCM simulation |
title_sort |
stratospheric temperatures and tracer transport in a nudged 4-year middle atmosphere gcm simulation |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00301035 https://hal.science/hal-00301035/document https://hal.science/hal-00301035/file/acpd-5-961-2005.pdf |
geographic |
Arctic Antarctic The Antarctic |
geographic_facet |
Arctic Antarctic 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-00301035 Atmospheric Chemistry and Physics Discussions, 2005, 5 (1), pp.961-1006 |
op_relation |
hal-00301035 https://hal.science/hal-00301035 https://hal.science/hal-00301035/document https://hal.science/hal-00301035/file/acpd-5-961-2005.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1784260861575036928 |