On the Relation between Gravity Waves and Wind Speed in the Lower Stratosphere over the Southern Ocean
International audience The relationship between gravity wave momentum fluxes and local wind speed is investigated for oceanic regions at high southern latitudes during austral spring. The motivation is to better describe the gravity wave field by identifying a simple relationship between gravity wav...
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Online Access: | https://insu.hal.science/insu-03727072 https://insu.hal.science/insu-03727072/document https://insu.hal.science/insu-03727072/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20On%20the%20Relation%20between%20Gravity%20Waves%20and%20Wind%20Speed%20in%20the%20Lower%20Stratosphere%20over%20the%20Southern%20Ocean.pdf https://doi.org/10.1175/JAS-D-16-0096.1 |
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ftsorbonneuniv:oai:HAL:insu-03727072v1 2024-09-15T18:37:19+00:00 On the Relation between Gravity Waves and Wind Speed in the Lower Stratosphere over the Southern Ocean Plougonven, Riwal Jewtoukoff, Valérian Lott, François Hertzog, Albert 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) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-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) 2017 https://insu.hal.science/insu-03727072 https://insu.hal.science/insu-03727072/document https://insu.hal.science/insu-03727072/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20On%20the%20Relation%20between%20Gravity%20Waves%20and%20Wind%20Speed%20in%20the%20Lower%20Stratosphere%20over%20the%20Southern%20Ocean.pdf https://doi.org/10.1175/JAS-D-16-0096.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JAS-D-16-0096.1 insu-03727072 https://insu.hal.science/insu-03727072 https://insu.hal.science/insu-03727072/document https://insu.hal.science/insu-03727072/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20On%20the%20Relation%20between%20Gravity%20Waves%20and%20Wind%20Speed%20in%20the%20Lower%20Stratosphere%20over%20the%20Southern%20Ocean.pdf BIBCODE: 2017JAtS.74.1075P doi:10.1175/JAS-D-16-0096.1 info:eu-repo/semantics/OpenAccess ISSN: 0022-4928 EISSN: 1520-0469 Journal of the Atmospheric Sciences https://insu.hal.science/insu-03727072 Journal of the Atmospheric Sciences, 2017, 74, pp.1075-1093. ⟨10.1175/JAS-D-16-0096.1⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2017 ftsorbonneuniv https://doi.org/10.1175/JAS-D-16-0096.1 2024-08-01T23:46:51Z International audience The relationship between gravity wave momentum fluxes and local wind speed is investigated for oceanic regions at high southern latitudes during austral spring. The motivation is to better describe the gravity wave field by identifying a simple relationship between gravity waves and the large-scale flow. The tools used to describe the gravity waves are probability density functions of the gravity wave momentum fluxes. Three independent datasets covering high latitudes in the Southern Hemisphere springtime are analyzed: simulations with a mesoscale model, analyses from the European Centre for Medium-Range Weather Forecasts, and observations from superpressure balloons of the Concordiasi campaign in 2010. A remarkably robust relation is found, with stronger momentum fluxes much more likely in regions of strong winds. The tails of the probability density functions are well described as lognormal. The median momentum flux increases linearly with background wind speed: for winds stronger than 50 m s -1 , the median gravity wave momentum fluxes are about 4 times larger than for winds weaker than 10 m s -1 . From model output, this relation is found to be relevant from the tropopause to the midstratosphere at least. The flux dependence on wind speed shows a somewhat steeper slope at higher altitude. Several different processes contribute to this relation, involving both the distribution of sources and the effects of propagation and filtering. It is argued that the location of tropospheric sources is the main contributor in the upper troposphere and lowermost stratosphere and that lateral propagation into regions of strong winds becomes increasingly important above. Article in Journal/Newspaper Southern Ocean HAL Sorbonne Université Journal of the Atmospheric Sciences 74 4 1075 1093 |
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Open Polar |
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HAL Sorbonne Université |
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ftsorbonneuniv |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Plougonven, Riwal Jewtoukoff, Valérian Lott, François Hertzog, Albert On the Relation between Gravity Waves and Wind Speed in the Lower Stratosphere over the Southern Ocean |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience The relationship between gravity wave momentum fluxes and local wind speed is investigated for oceanic regions at high southern latitudes during austral spring. The motivation is to better describe the gravity wave field by identifying a simple relationship between gravity waves and the large-scale flow. The tools used to describe the gravity waves are probability density functions of the gravity wave momentum fluxes. Three independent datasets covering high latitudes in the Southern Hemisphere springtime are analyzed: simulations with a mesoscale model, analyses from the European Centre for Medium-Range Weather Forecasts, and observations from superpressure balloons of the Concordiasi campaign in 2010. A remarkably robust relation is found, with stronger momentum fluxes much more likely in regions of strong winds. The tails of the probability density functions are well described as lognormal. The median momentum flux increases linearly with background wind speed: for winds stronger than 50 m s -1 , the median gravity wave momentum fluxes are about 4 times larger than for winds weaker than 10 m s -1 . From model output, this relation is found to be relevant from the tropopause to the midstratosphere at least. The flux dependence on wind speed shows a somewhat steeper slope at higher altitude. Several different processes contribute to this relation, involving both the distribution of sources and the effects of propagation and filtering. It is argued that the location of tropospheric sources is the main contributor in the upper troposphere and lowermost stratosphere and that lateral propagation into regions of strong winds becomes increasingly important above. |
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) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-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 Jewtoukoff, Valérian Lott, François Hertzog, Albert |
author_facet |
Plougonven, Riwal Jewtoukoff, Valérian Lott, François Hertzog, Albert |
author_sort |
Plougonven, Riwal |
title |
On the Relation between Gravity Waves and Wind Speed in the Lower Stratosphere over the Southern Ocean |
title_short |
On the Relation between Gravity Waves and Wind Speed in the Lower Stratosphere over the Southern Ocean |
title_full |
On the Relation between Gravity Waves and Wind Speed in the Lower Stratosphere over the Southern Ocean |
title_fullStr |
On the Relation between Gravity Waves and Wind Speed in the Lower Stratosphere over the Southern Ocean |
title_full_unstemmed |
On the Relation between Gravity Waves and Wind Speed in the Lower Stratosphere over the Southern Ocean |
title_sort |
on the relation between gravity waves and wind speed in the lower stratosphere over the southern ocean |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://insu.hal.science/insu-03727072 https://insu.hal.science/insu-03727072/document https://insu.hal.science/insu-03727072/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20On%20the%20Relation%20between%20Gravity%20Waves%20and%20Wind%20Speed%20in%20the%20Lower%20Stratosphere%20over%20the%20Southern%20Ocean.pdf https://doi.org/10.1175/JAS-D-16-0096.1 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0022-4928 EISSN: 1520-0469 Journal of the Atmospheric Sciences https://insu.hal.science/insu-03727072 Journal of the Atmospheric Sciences, 2017, 74, pp.1075-1093. ⟨10.1175/JAS-D-16-0096.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JAS-D-16-0096.1 insu-03727072 https://insu.hal.science/insu-03727072 https://insu.hal.science/insu-03727072/document https://insu.hal.science/insu-03727072/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20On%20the%20Relation%20between%20Gravity%20Waves%20and%20Wind%20Speed%20in%20the%20Lower%20Stratosphere%20over%20the%20Southern%20Ocean.pdf BIBCODE: 2017JAtS.74.1075P doi:10.1175/JAS-D-16-0096.1 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JAS-D-16-0096.1 |
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Journal of the Atmospheric Sciences |
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74 |
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4 |
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1075 |
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1093 |
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1810481688122228736 |