Links between the mountain torque and the Arctic Oscillation in the Laboratoire de Météorologie Dynamique (LMDz), general circulation model
International audience Recent papers suggest that in the National Center for Environmental Prediction (NCEP) reanalysis data there is a dynamical link between the mountain torque and the Arctic Oscillation (AO) at periodicities near and below 30 days. This link essentially occurs because the AO is a...
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Online Access: | https://hal.science/hal-04109942 https://hal.science/hal-04109942/document https://hal.science/hal-04109942/file/Journal%20of%20Geophysical%20Research%20Atmospheres%20-%202005%20-%20Lott%20-%20Links%20between%20the%20mountain%20torque%20and%20the%20Arctic%20Oscillation.pdf https://doi.org/10.1029/2005JD006073 |
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ftecoleponts:oai:HAL:hal-04109942v1 2024-06-09T07:40:25+00:00 Links between the mountain torque and the Arctic Oscillation in the Laboratoire de Météorologie Dynamique (LMDz), general circulation model Lott, F. Goudard, L. Martin, A. 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-04109942 https://hal.science/hal-04109942/document https://hal.science/hal-04109942/file/Journal%20of%20Geophysical%20Research%20Atmospheres%20-%202005%20-%20Lott%20-%20Links%20between%20the%20mountain%20torque%20and%20the%20Arctic%20Oscillation.pdf https://doi.org/10.1029/2005JD006073 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2005JD006073 hal-04109942 https://hal.science/hal-04109942 https://hal.science/hal-04109942/document https://hal.science/hal-04109942/file/Journal%20of%20Geophysical%20Research%20Atmospheres%20-%202005%20-%20Lott%20-%20Links%20between%20the%20mountain%20torque%20and%20the%20Arctic%20Oscillation.pdf BIBCODE: 2005JGRD.11022107L doi:10.1029/2005JD006073 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal.science/hal-04109942 Journal of Geophysical Research: Atmospheres, 2005, 110, ⟨10.1029/2005JD006073⟩ mountain torque Arctic Oscillation atmospheric angular momentum Earth Science [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2005 ftecoleponts https://doi.org/10.1029/2005JD006073 2024-05-16T12:32:04Z International audience Recent papers suggest that in the National Center for Environmental Prediction (NCEP) reanalysis data there is a dynamical link between the mountain torque and the Arctic Oscillation (AO) at periodicities near and below 30 days. This link essentially occurs because the AO is associated with a redistribution of mass from the polar regions to the midlatitudes, hence giving a substantial contribution to the mass term of the atmospheric angular momentum (AAM). These results are confirmed here by using a 30-year simulation done with the Laboratoire de Météorologie Dynamique, zoom (LMDz), general circulation model. In particular, we verify that the changes in mass AAM occurring during intraseasonal variations of the AO are in good part driven by the mountain torque in the model also. In this respect, the LMDz model has the great advantage of closing the AAM budget nearly exactly, which is not the case with the NCEP reanalysis data. As the Antarctic Oscillation (AAO) is also associated with a redistribution of mass from the polar regions to the midlatitudes, its contribution to the AAM budget is also presented. As there are many fewer mountains in the Southern Hemisphere, we show that in the model as well as in the reanalysis the changes in mass AAM during intraseasonal variations of the AAO are in good part equilibrated by changes of opposite sign in wind AAM. The main interest of these results is that the mountain torque drives the changes in AAM, so it can sometimes participate actively in changes of the AO. It has a predictive value that is significant but small, around 10-15% for periodicities near and below one month, while a good fraction of the AO variability occurs at longer timescales. Article in Journal/Newspaper Antarc* Antarctic Arctic École des Ponts ParisTech: HAL Arctic Antarctic The Antarctic Journal of Geophysical Research 110 D22 |
institution |
Open Polar |
collection |
École des Ponts ParisTech: HAL |
op_collection_id |
ftecoleponts |
language |
English |
topic |
mountain torque Arctic Oscillation atmospheric angular momentum Earth Science [SDU]Sciences of the Universe [physics] |
spellingShingle |
mountain torque Arctic Oscillation atmospheric angular momentum Earth Science [SDU]Sciences of the Universe [physics] Lott, F. Goudard, L. Martin, A. Links between the mountain torque and the Arctic Oscillation in the Laboratoire de Météorologie Dynamique (LMDz), general circulation model |
topic_facet |
mountain torque Arctic Oscillation atmospheric angular momentum Earth Science [SDU]Sciences of the Universe [physics] |
description |
International audience Recent papers suggest that in the National Center for Environmental Prediction (NCEP) reanalysis data there is a dynamical link between the mountain torque and the Arctic Oscillation (AO) at periodicities near and below 30 days. This link essentially occurs because the AO is associated with a redistribution of mass from the polar regions to the midlatitudes, hence giving a substantial contribution to the mass term of the atmospheric angular momentum (AAM). These results are confirmed here by using a 30-year simulation done with the Laboratoire de Météorologie Dynamique, zoom (LMDz), general circulation model. In particular, we verify that the changes in mass AAM occurring during intraseasonal variations of the AO are in good part driven by the mountain torque in the model also. In this respect, the LMDz model has the great advantage of closing the AAM budget nearly exactly, which is not the case with the NCEP reanalysis data. As the Antarctic Oscillation (AAO) is also associated with a redistribution of mass from the polar regions to the midlatitudes, its contribution to the AAM budget is also presented. As there are many fewer mountains in the Southern Hemisphere, we show that in the model as well as in the reanalysis the changes in mass AAM during intraseasonal variations of the AAO are in good part equilibrated by changes of opposite sign in wind AAM. The main interest of these results is that the mountain torque drives the changes in AAM, so it can sometimes participate actively in changes of the AO. It has a predictive value that is significant but small, around 10-15% for periodicities near and below one month, while a good fraction of the AO variability occurs at longer timescales. |
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, F. Goudard, L. Martin, A. |
author_facet |
Lott, F. Goudard, L. Martin, A. |
author_sort |
Lott, F. |
title |
Links between the mountain torque and the Arctic Oscillation in the Laboratoire de Météorologie Dynamique (LMDz), general circulation model |
title_short |
Links between the mountain torque and the Arctic Oscillation in the Laboratoire de Météorologie Dynamique (LMDz), general circulation model |
title_full |
Links between the mountain torque and the Arctic Oscillation in the Laboratoire de Météorologie Dynamique (LMDz), general circulation model |
title_fullStr |
Links between the mountain torque and the Arctic Oscillation in the Laboratoire de Météorologie Dynamique (LMDz), general circulation model |
title_full_unstemmed |
Links between the mountain torque and the Arctic Oscillation in the Laboratoire de Météorologie Dynamique (LMDz), general circulation model |
title_sort |
links between the mountain torque and the arctic oscillation in the laboratoire de météorologie dynamique (lmdz), general circulation model |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-04109942 https://hal.science/hal-04109942/document https://hal.science/hal-04109942/file/Journal%20of%20Geophysical%20Research%20Atmospheres%20-%202005%20-%20Lott%20-%20Links%20between%20the%20mountain%20torque%20and%20the%20Arctic%20Oscillation.pdf https://doi.org/10.1029/2005JD006073 |
geographic |
Arctic Antarctic The Antarctic |
geographic_facet |
Arctic Antarctic The Antarctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal.science/hal-04109942 Journal of Geophysical Research: Atmospheres, 2005, 110, ⟨10.1029/2005JD006073⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2005JD006073 hal-04109942 https://hal.science/hal-04109942 https://hal.science/hal-04109942/document https://hal.science/hal-04109942/file/Journal%20of%20Geophysical%20Research%20Atmospheres%20-%202005%20-%20Lott%20-%20Links%20between%20the%20mountain%20torque%20and%20the%20Arctic%20Oscillation.pdf BIBCODE: 2005JGRD.11022107L doi:10.1029/2005JD006073 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2005JD006073 |
container_title |
Journal of Geophysical Research |
container_volume |
110 |
container_issue |
D22 |
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1801383831492624384 |