On the intermittency of gravity wave momentum flux in the stratosphere
International audience In this article, long-duration balloon and spaceborne observations, and mesoscale numerical simulations are used to study the intermittency of gravity waves in the lower stratosphere above Antarctica and the Southern Ocean; namely, the characteristics of the gravity wave momen...
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Online Access: | https://hal.science/hal-01113617 https://hal.science/hal-01113617/document https://hal.science/hal-01113617/file/JAS-D-12-09.pdf https://doi.org/10.1175/JAS-D-12-09.1 |
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ftinsu:oai:HAL:hal-01113617v1 2023-06-18T03:37:12+02:00 On the intermittency of gravity wave momentum flux in the stratosphere Hertzog, Albert Alexander, J.M. Plougonven, Riwal 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) Colorado Research Associates Boulder (CoRA) NorthWest Research Associates (NWRA) 2012 https://hal.science/hal-01113617 https://hal.science/hal-01113617/document https://hal.science/hal-01113617/file/JAS-D-12-09.pdf https://doi.org/10.1175/JAS-D-12-09.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JAS-D-12-09.1 hal-01113617 https://hal.science/hal-01113617 https://hal.science/hal-01113617/document https://hal.science/hal-01113617/file/JAS-D-12-09.pdf doi:10.1175/JAS-D-12-09.1 info:eu-repo/semantics/OpenAccess ISSN: 0022-4928 EISSN: 1520-0469 Journal of the Atmospheric Sciences https://hal.science/hal-01113617 Journal of the Atmospheric Sciences, 2012, 69 (11), pp.3433-3448. ⟨10.1175/JAS-D-12-09.1⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2012 ftinsu https://doi.org/10.1175/JAS-D-12-09.1 2023-06-06T01:25:38Z International audience In this article, long-duration balloon and spaceborne observations, and mesoscale numerical simulations are used to study the intermittency of gravity waves in the lower stratosphere above Antarctica and the Southern Ocean; namely, the characteristics of the gravity wave momentum-flux probability density functions (pdfs) obtained with these three datasets are described. The pdfs consistently exhibit long tails associated with the occurrence of rare and large-amplitude events. The pdf tails are even longer above mountains than above oceanic areas, which is in agreement with previous studies of gravity wave intermittency in this region. It is moreover found that these rare, large-amplitude events represent the main contribution to the total momentum flux during the winter regime of the stratospheric circulation. In contrast, the wave intermittency significantly decreases when stratospheric easterlies develop in late spring and summer. It is also shown that, except above mountainous areas in winter, the momentum-flux pdfs tend to behave like lognormal distributions. Monte Carlo simulations are undertaken to examine the role played by critical levels in influencing the shape of momentum-flux pdfs. In particular, the study finds that the lognormal shape may result from the propagation of a wave spectrum into a varying background wind field that generates the occurrence of frequent critical levels. © 2012 American Meteorological Society. Article in Journal/Newspaper Antarc* Antarctica Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Southern Ocean Journal of the Atmospheric Sciences 69 11 3433 3448 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Hertzog, Albert Alexander, J.M. Plougonven, Riwal On the intermittency of gravity wave momentum flux in the stratosphere |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience In this article, long-duration balloon and spaceborne observations, and mesoscale numerical simulations are used to study the intermittency of gravity waves in the lower stratosphere above Antarctica and the Southern Ocean; namely, the characteristics of the gravity wave momentum-flux probability density functions (pdfs) obtained with these three datasets are described. The pdfs consistently exhibit long tails associated with the occurrence of rare and large-amplitude events. The pdf tails are even longer above mountains than above oceanic areas, which is in agreement with previous studies of gravity wave intermittency in this region. It is moreover found that these rare, large-amplitude events represent the main contribution to the total momentum flux during the winter regime of the stratospheric circulation. In contrast, the wave intermittency significantly decreases when stratospheric easterlies develop in late spring and summer. It is also shown that, except above mountainous areas in winter, the momentum-flux pdfs tend to behave like lognormal distributions. Monte Carlo simulations are undertaken to examine the role played by critical levels in influencing the shape of momentum-flux pdfs. In particular, the study finds that the lognormal shape may result from the propagation of a wave spectrum into a varying background wind field that generates the occurrence of frequent critical levels. © 2012 American Meteorological Society. |
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) Colorado Research Associates Boulder (CoRA) NorthWest Research Associates (NWRA) |
format |
Article in Journal/Newspaper |
author |
Hertzog, Albert Alexander, J.M. Plougonven, Riwal |
author_facet |
Hertzog, Albert Alexander, J.M. Plougonven, Riwal |
author_sort |
Hertzog, Albert |
title |
On the intermittency of gravity wave momentum flux in the stratosphere |
title_short |
On the intermittency of gravity wave momentum flux in the stratosphere |
title_full |
On the intermittency of gravity wave momentum flux in the stratosphere |
title_fullStr |
On the intermittency of gravity wave momentum flux in the stratosphere |
title_full_unstemmed |
On the intermittency of gravity wave momentum flux in the stratosphere |
title_sort |
on the intermittency of gravity wave momentum flux in the stratosphere |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-01113617 https://hal.science/hal-01113617/document https://hal.science/hal-01113617/file/JAS-D-12-09.pdf https://doi.org/10.1175/JAS-D-12-09.1 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_source |
ISSN: 0022-4928 EISSN: 1520-0469 Journal of the Atmospheric Sciences https://hal.science/hal-01113617 Journal of the Atmospheric Sciences, 2012, 69 (11), pp.3433-3448. ⟨10.1175/JAS-D-12-09.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JAS-D-12-09.1 hal-01113617 https://hal.science/hal-01113617 https://hal.science/hal-01113617/document https://hal.science/hal-01113617/file/JAS-D-12-09.pdf doi:10.1175/JAS-D-12-09.1 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JAS-D-12-09.1 |
container_title |
Journal of the Atmospheric Sciences |
container_volume |
69 |
container_issue |
11 |
container_start_page |
3433 |
op_container_end_page |
3448 |
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1769010089217228800 |