Case studies of nonorographic gravity waves over the Southern Ocean emphasize the role of moisture
International audience Two case studies of nonorographic gravity waves are carried out for wave events that occurred over the Southern Ocean in November 2005. Mesoscale simulations were carried out with the Weather and Research Forecast model. The simulated waves were compared to observations from s...
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Online Access: | https://hal.science/hal-04115210 https://hal.science/hal-04115210/document https://hal.science/hal-04115210/file/JGR%20Atmospheres%20-%202015%20-%20Plougonven%20-%20Case%20studies%20of%20nonorographic%20gravity%20waves%20over%20the%20Southern%20Ocean%20emphasize%20the.pdf https://doi.org/10.1002/2014JD022332 |
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ftsorbonneuniv:oai:HAL:hal-04115210v1 2024-06-09T07:49:44+00:00 Case studies of nonorographic gravity waves over the Southern Ocean emphasize the role of moisture Plougonven, Riwal Hertzog, Albert Alexander, M. Joan 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) 2015 https://hal.science/hal-04115210 https://hal.science/hal-04115210/document https://hal.science/hal-04115210/file/JGR%20Atmospheres%20-%202015%20-%20Plougonven%20-%20Case%20studies%20of%20nonorographic%20gravity%20waves%20over%20the%20Southern%20Ocean%20emphasize%20the.pdf https://doi.org/10.1002/2014JD022332 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2014JD022332 hal-04115210 https://hal.science/hal-04115210 https://hal.science/hal-04115210/document https://hal.science/hal-04115210/file/JGR%20Atmospheres%20-%202015%20-%20Plougonven%20-%20Case%20studies%20of%20nonorographic%20gravity%20waves%20over%20the%20Southern%20Ocean%20emphasize%20the.pdf BIBCODE: 2015JGRD.120.1278P doi:10.1002/2014JD022332 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-04115210 Journal of Geophysical Research: Atmospheres, 2015, 120, pp.1278-1299. ⟨10.1002/2014JD022332⟩ gravity waves fronts mesoscale simulations balloons Earth Science [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2015 ftsorbonneuniv https://doi.org/10.1002/2014JD022332 2024-05-16T23:52:45Z International audience Two case studies of nonorographic gravity waves are carried out for wave events that occurred over the Southern Ocean in November 2005. Mesoscale simulations were carried out with the Weather and Research Forecast model. The simulated waves were compared to observations from superpressure balloons of the Vorcore campaign and from the High Resolution Dynamic Limb Sounder satellite. Satisfactory agreement is found, giving confidence in the estimations of wave parameters and amplitudes. For the amplitudes, both the model and observations provide a lower bound, for different reasons. Waves are found in the lower stratosphere with horizontal wavelengths of the order of 150-200 km in the horizontal, 5-8 km in the vertical, corresponding to intrinsic frequencies between 5 and 10 f, where f is the Coriolis parameter. Although the tropospheric flow is very different between the two cases, there are features which are common and appear significant for the gravity waves: these include intense localized updrafts associated with convection in the troposphere and a displaced polar vortex inducing strong winds in the stratosphere above the frontal region. Relative to theoretical expectations, the simulations emphasize the role of moisture. Intrinsic frequencies are significantly higher than those expected for waves produced by dry spontaneous generation from jets. To quantify the contribution of moisture, dry simulations were carried out, yielding momentum fluxes over oceanic regions that were 2.5 times weaker. Identification of the generation mechanisms in these complex flows calls for further study, and these should include moisture and a realistic stratospheric jet. Article in Journal/Newspaper Southern Ocean HAL Sorbonne Université Southern Ocean Journal of Geophysical Research: Atmospheres 120 4 1278 1299 |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
gravity waves fronts mesoscale simulations balloons Earth Science [SDU]Sciences of the Universe [physics] |
spellingShingle |
gravity waves fronts mesoscale simulations balloons Earth Science [SDU]Sciences of the Universe [physics] Plougonven, Riwal Hertzog, Albert Alexander, M. Joan Case studies of nonorographic gravity waves over the Southern Ocean emphasize the role of moisture |
topic_facet |
gravity waves fronts mesoscale simulations balloons Earth Science [SDU]Sciences of the Universe [physics] |
description |
International audience Two case studies of nonorographic gravity waves are carried out for wave events that occurred over the Southern Ocean in November 2005. Mesoscale simulations were carried out with the Weather and Research Forecast model. The simulated waves were compared to observations from superpressure balloons of the Vorcore campaign and from the High Resolution Dynamic Limb Sounder satellite. Satisfactory agreement is found, giving confidence in the estimations of wave parameters and amplitudes. For the amplitudes, both the model and observations provide a lower bound, for different reasons. Waves are found in the lower stratosphere with horizontal wavelengths of the order of 150-200 km in the horizontal, 5-8 km in the vertical, corresponding to intrinsic frequencies between 5 and 10 f, where f is the Coriolis parameter. Although the tropospheric flow is very different between the two cases, there are features which are common and appear significant for the gravity waves: these include intense localized updrafts associated with convection in the troposphere and a displaced polar vortex inducing strong winds in the stratosphere above the frontal region. Relative to theoretical expectations, the simulations emphasize the role of moisture. Intrinsic frequencies are significantly higher than those expected for waves produced by dry spontaneous generation from jets. To quantify the contribution of moisture, dry simulations were carried out, yielding momentum fluxes over oceanic regions that were 2.5 times weaker. Identification of the generation mechanisms in these complex flows calls for further study, and these should include moisture and a realistic stratospheric jet. |
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 |
Plougonven, Riwal Hertzog, Albert Alexander, M. Joan |
author_facet |
Plougonven, Riwal Hertzog, Albert Alexander, M. Joan |
author_sort |
Plougonven, Riwal |
title |
Case studies of nonorographic gravity waves over the Southern Ocean emphasize the role of moisture |
title_short |
Case studies of nonorographic gravity waves over the Southern Ocean emphasize the role of moisture |
title_full |
Case studies of nonorographic gravity waves over the Southern Ocean emphasize the role of moisture |
title_fullStr |
Case studies of nonorographic gravity waves over the Southern Ocean emphasize the role of moisture |
title_full_unstemmed |
Case studies of nonorographic gravity waves over the Southern Ocean emphasize the role of moisture |
title_sort |
case studies of nonorographic gravity waves over the southern ocean emphasize the role of moisture |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.science/hal-04115210 https://hal.science/hal-04115210/document https://hal.science/hal-04115210/file/JGR%20Atmospheres%20-%202015%20-%20Plougonven%20-%20Case%20studies%20of%20nonorographic%20gravity%20waves%20over%20the%20Southern%20Ocean%20emphasize%20the.pdf https://doi.org/10.1002/2014JD022332 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal.science/hal-04115210 Journal of Geophysical Research: Atmospheres, 2015, 120, pp.1278-1299. ⟨10.1002/2014JD022332⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2014JD022332 hal-04115210 https://hal.science/hal-04115210 https://hal.science/hal-04115210/document https://hal.science/hal-04115210/file/JGR%20Atmospheres%20-%202015%20-%20Plougonven%20-%20Case%20studies%20of%20nonorographic%20gravity%20waves%20over%20the%20Southern%20Ocean%20emphasize%20the.pdf BIBCODE: 2015JGRD.120.1278P doi:10.1002/2014JD022332 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2014JD022332 |
container_title |
Journal of Geophysical Research: Atmospheres |
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120 |
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4 |
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1278 |
op_container_end_page |
1299 |
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