The stratospheric version of LMDz: dynamical climatologies, arctic oscillation, and impact on the surface climate
International audience A climatology of the stratosphere is determined from a 20-year integration with the stratospheric version of the Atmospheric General Circulation Model LMDz. The model has an upper boundary at near 65 km, uses a Doppler spread non-orographic gravity waves drag parameterization...
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ftsorbonneuniv:oai:HAL:hal-04109941v1 2024-06-09T07:44:00+00:00 The stratospheric version of LMDz: dynamical climatologies, arctic oscillation, and impact on the surface climate Lott, François Fairhead, Laurent Hourdin, Frederic Levan, Phu Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) 2005 https://hal.science/hal-04109941 https://doi.org/10.1007/s00382-005-0064-x en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-005-0064-x hal-04109941 https://hal.science/hal-04109941 BIBCODE: 2005ClDy.25.851L doi:10.1007/s00382-005-0064-x ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-04109941 Climate Dynamics, 2005, 25, pp.851-868. ⟨10.1007/s00382-005-0064-x⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2005 ftsorbonneuniv https://doi.org/10.1007/s00382-005-0064-x 2024-05-16T23:52:45Z International audience A climatology of the stratosphere is determined from a 20-year integration with the stratospheric version of the Atmospheric General Circulation Model LMDz. The model has an upper boundary at near 65 km, uses a Doppler spread non-orographic gravity waves drag parameterization and a subgrid-scale orography parameterization. It also has a Rayleigh damping layer for resolved waves only (not the zonal mean flow) over the top 5 km. This paper describes the basic features of the model and some aspects of its radiative-dynamical climatology. Standard first order diagnostics are presented but some emphasis is given to the model’s ability to reproduce the low frequency variability of the stratosphere in the winter northern hemisphere. In this model, the stratospheric variability is dominated at each altitudes by patterns which have some similarities with the arctic oscillation (AO). For those patterns, the signal sometimes descends from the stratosphere to the troposphere. In an experiment where the parameterized orographic gravity waves that reach the stratosphere are exaggerated, the model stratosphere in the NH presents much less variability. Although the stratospheric variability is still dominated by patterns that resemble to the AO, the downward influence of the stratosphere along these patterns is near entirely lost. In the same time, the persistence of the surface AO decreases, which is consistent with the picture that this persistence is linked to the descent of the AO signal from the stratosphere to the troposphere. A comparison between the stratospheric version of the model, and its routinely used tropospheric version is also done. It shows that the introduction of the stratosphere in a model that already has a realistic AO persistence can lead to overestimate the actual influence of the stratospheric dynamics onto the surface AO. Although this result is certainly model dependent, it suggests that the introduction of the stratosphere in a GCM also call for a new adjustment of the model ... Article in Journal/Newspaper Arctic HAL Sorbonne Université Arctic Climate Dynamics 25 7-8 851 868 |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Lott, François Fairhead, Laurent Hourdin, Frederic Levan, Phu The stratospheric version of LMDz: dynamical climatologies, arctic oscillation, and impact on the surface climate |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience A climatology of the stratosphere is determined from a 20-year integration with the stratospheric version of the Atmospheric General Circulation Model LMDz. The model has an upper boundary at near 65 km, uses a Doppler spread non-orographic gravity waves drag parameterization and a subgrid-scale orography parameterization. It also has a Rayleigh damping layer for resolved waves only (not the zonal mean flow) over the top 5 km. This paper describes the basic features of the model and some aspects of its radiative-dynamical climatology. Standard first order diagnostics are presented but some emphasis is given to the model’s ability to reproduce the low frequency variability of the stratosphere in the winter northern hemisphere. In this model, the stratospheric variability is dominated at each altitudes by patterns which have some similarities with the arctic oscillation (AO). For those patterns, the signal sometimes descends from the stratosphere to the troposphere. In an experiment where the parameterized orographic gravity waves that reach the stratosphere are exaggerated, the model stratosphere in the NH presents much less variability. Although the stratospheric variability is still dominated by patterns that resemble to the AO, the downward influence of the stratosphere along these patterns is near entirely lost. In the same time, the persistence of the surface AO decreases, which is consistent with the picture that this persistence is linked to the descent of the AO signal from the stratosphere to the troposphere. A comparison between the stratospheric version of the model, and its routinely used tropospheric version is also done. It shows that the introduction of the stratosphere in a model that already has a realistic AO persistence can lead to overestimate the actual influence of the stratospheric dynamics onto the surface AO. Although this result is certainly model dependent, it suggests that the introduction of the stratosphere in a GCM also call for a new adjustment of the model ... |
author2 |
Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) |
format |
Article in Journal/Newspaper |
author |
Lott, François Fairhead, Laurent Hourdin, Frederic Levan, Phu |
author_facet |
Lott, François Fairhead, Laurent Hourdin, Frederic Levan, Phu |
author_sort |
Lott, François |
title |
The stratospheric version of LMDz: dynamical climatologies, arctic oscillation, and impact on the surface climate |
title_short |
The stratospheric version of LMDz: dynamical climatologies, arctic oscillation, and impact on the surface climate |
title_full |
The stratospheric version of LMDz: dynamical climatologies, arctic oscillation, and impact on the surface climate |
title_fullStr |
The stratospheric version of LMDz: dynamical climatologies, arctic oscillation, and impact on the surface climate |
title_full_unstemmed |
The stratospheric version of LMDz: dynamical climatologies, arctic oscillation, and impact on the surface climate |
title_sort |
stratospheric version of lmdz: dynamical climatologies, arctic oscillation, and impact on the surface climate |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-04109941 https://doi.org/10.1007/s00382-005-0064-x |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.science/hal-04109941 Climate Dynamics, 2005, 25, pp.851-868. ⟨10.1007/s00382-005-0064-x⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-005-0064-x hal-04109941 https://hal.science/hal-04109941 BIBCODE: 2005ClDy.25.851L doi:10.1007/s00382-005-0064-x |
op_doi |
https://doi.org/10.1007/s00382-005-0064-x |
container_title |
Climate Dynamics |
container_volume |
25 |
container_issue |
7-8 |
container_start_page |
851 |
op_container_end_page |
868 |
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1801372817872125952 |