Local Mixing Events in the Upper Troposphere and Lower Stratosphere. Part II: Seasonal and Interannual Variability
International audience The Lyapunov diffusivity is used to investigate local isentropic mixing events in the upper troposphere–lower stratosphere (UTLS) region. The diagnostic highlights the seasonal cycle of the longitudinally varying mixing properties, in particular those associated with the monso...
Published in: | Journal of the Atmospheric Sciences |
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Main Authors: | , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2009
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Online Access: | https://hal.archives-ouvertes.fr/hal-00763159 https://hal.archives-ouvertes.fr/hal-00763159/document https://hal.archives-ouvertes.fr/hal-00763159/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20Local%20Mixing%20Events%20in%20the%20Upper%20Troposphere%20and%20Lower%20Stratosphere.%20Part%20II%20Seasonal%20and%20Interannual%20Variability.pdf https://doi.org/10.1175/2009JAS2983.1 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Shuckburgh, Emily D'Ovidio, Francesco Legras, Bernard Local Mixing Events in the Upper Troposphere and Lower Stratosphere. Part II: Seasonal and Interannual Variability |
topic_facet |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
International audience The Lyapunov diffusivity is used to investigate local isentropic mixing events in the upper troposphere–lower stratosphere (UTLS) region. The diagnostic highlights the seasonal cycle of the longitudinally varying mixing properties, in particular those associated with the monsoon circulations and the westerly ducts in the subtropics. The results are broadly consistent with studies of Rossby wave–breaking frequencies. The mixing structure is shown to be modulated by modes of atmospheric variability. El Niño–Southern Oscillation (ENSO) is found to strongly influence the mixing structure throughout the tropics and subtropics. The subtropical jet is associated with longitudinal bands of mixing minima (isentropic mixing barriers) separated by synoptic-scale regions of strong mixing activity. The greatest ENSO modulation in December–February is confined to the Pacific sector, where the barriers associated with the subtropical jets extend farther into the eastern Pacific, and in the western Pacific a barrier is found at the equator during the positive phase. During June–August, the influence is seen to extend beyond the Pacific region, with the barrier at the subtropical jet in the Southern Hemisphere increasing in strength at all longitudes and with an increase in strength (and isolation of) monsoon-related mixing over Asia and North America. The local influence of the North Atlantic Oscillation in wintertime is investigated. During the positive phase, a double-barrier structure is associated with the subtropical jet, the northern branch crosses the Atlantic toward Scandinavia, and the southern branch tends toward North Africa. The Antarctic Oscillation is shown to influence whether the subvortex region is isolated from midlatitudes. |
author2 |
British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Shuckburgh, Emily D'Ovidio, Francesco Legras, Bernard |
author_facet |
Shuckburgh, Emily D'Ovidio, Francesco Legras, Bernard |
author_sort |
Shuckburgh, Emily |
title |
Local Mixing Events in the Upper Troposphere and Lower Stratosphere. Part II: Seasonal and Interannual Variability |
title_short |
Local Mixing Events in the Upper Troposphere and Lower Stratosphere. Part II: Seasonal and Interannual Variability |
title_full |
Local Mixing Events in the Upper Troposphere and Lower Stratosphere. Part II: Seasonal and Interannual Variability |
title_fullStr |
Local Mixing Events in the Upper Troposphere and Lower Stratosphere. Part II: Seasonal and Interannual Variability |
title_full_unstemmed |
Local Mixing Events in the Upper Troposphere and Lower Stratosphere. Part II: Seasonal and Interannual Variability |
title_sort |
local mixing events in the upper troposphere and lower stratosphere. part ii: seasonal and interannual variability |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.archives-ouvertes.fr/hal-00763159 https://hal.archives-ouvertes.fr/hal-00763159/document https://hal.archives-ouvertes.fr/hal-00763159/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20Local%20Mixing%20Events%20in%20the%20Upper%20Troposphere%20and%20Lower%20Stratosphere.%20Part%20II%20Seasonal%20and%20Interannual%20Variability.pdf https://doi.org/10.1175/2009JAS2983.1 |
geographic |
Antarctic The Antarctic Pacific |
geographic_facet |
Antarctic The Antarctic Pacific |
genre |
Antarc* Antarctic North Atlantic North Atlantic oscillation |
genre_facet |
Antarc* Antarctic North Atlantic North Atlantic oscillation |
op_source |
ISSN: 0022-4928 EISSN: 1520-0469 Journal of the Atmospheric Sciences https://hal.archives-ouvertes.fr/hal-00763159 Journal of the Atmospheric Sciences, American Meteorological Society, 2009, 66, pp.3695. ⟨10.1175/2009JAS2983.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/2009JAS2983.1 hal-00763159 https://hal.archives-ouvertes.fr/hal-00763159 https://hal.archives-ouvertes.fr/hal-00763159/document https://hal.archives-ouvertes.fr/hal-00763159/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20Local%20Mixing%20Events%20in%20the%20Upper%20Troposphere%20and%20Lower%20Stratosphere.%20Part%20II%20Seasonal%20and%20Interannual%20Variability.pdf BIBCODE: 2009JAtS.66.3695S doi:10.1175/2009JAS2983.1 WOS: 000272616600010 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/2009JAS2983.1 |
container_title |
Journal of the Atmospheric Sciences |
container_volume |
66 |
container_issue |
12 |
container_start_page |
3695 |
op_container_end_page |
3706 |
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1766061566353997824 |
spelling |
ftccsdartic:oai:HAL:hal-00763159v1 2023-05-15T13:35:08+02:00 Local Mixing Events in the Upper Troposphere and Lower Stratosphere. Part II: Seasonal and Interannual Variability Shuckburgh, Emily D'Ovidio, Francesco Legras, Bernard British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 2009 https://hal.archives-ouvertes.fr/hal-00763159 https://hal.archives-ouvertes.fr/hal-00763159/document https://hal.archives-ouvertes.fr/hal-00763159/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20Local%20Mixing%20Events%20in%20the%20Upper%20Troposphere%20and%20Lower%20Stratosphere.%20Part%20II%20Seasonal%20and%20Interannual%20Variability.pdf https://doi.org/10.1175/2009JAS2983.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/2009JAS2983.1 hal-00763159 https://hal.archives-ouvertes.fr/hal-00763159 https://hal.archives-ouvertes.fr/hal-00763159/document https://hal.archives-ouvertes.fr/hal-00763159/file/%5B15200469%20-%20Journal%20of%20the%20Atmospheric%20Sciences%5D%20Local%20Mixing%20Events%20in%20the%20Upper%20Troposphere%20and%20Lower%20Stratosphere.%20Part%20II%20Seasonal%20and%20Interannual%20Variability.pdf BIBCODE: 2009JAtS.66.3695S doi:10.1175/2009JAS2983.1 WOS: 000272616600010 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0022-4928 EISSN: 1520-0469 Journal of the Atmospheric Sciences https://hal.archives-ouvertes.fr/hal-00763159 Journal of the Atmospheric Sciences, American Meteorological Society, 2009, 66, pp.3695. ⟨10.1175/2009JAS2983.1⟩ [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2009 ftccsdartic https://doi.org/10.1175/2009JAS2983.1 2021-12-04T23:50:50Z International audience The Lyapunov diffusivity is used to investigate local isentropic mixing events in the upper troposphere–lower stratosphere (UTLS) region. The diagnostic highlights the seasonal cycle of the longitudinally varying mixing properties, in particular those associated with the monsoon circulations and the westerly ducts in the subtropics. The results are broadly consistent with studies of Rossby wave–breaking frequencies. The mixing structure is shown to be modulated by modes of atmospheric variability. El Niño–Southern Oscillation (ENSO) is found to strongly influence the mixing structure throughout the tropics and subtropics. The subtropical jet is associated with longitudinal bands of mixing minima (isentropic mixing barriers) separated by synoptic-scale regions of strong mixing activity. The greatest ENSO modulation in December–February is confined to the Pacific sector, where the barriers associated with the subtropical jets extend farther into the eastern Pacific, and in the western Pacific a barrier is found at the equator during the positive phase. During June–August, the influence is seen to extend beyond the Pacific region, with the barrier at the subtropical jet in the Southern Hemisphere increasing in strength at all longitudes and with an increase in strength (and isolation of) monsoon-related mixing over Asia and North America. The local influence of the North Atlantic Oscillation in wintertime is investigated. During the positive phase, a double-barrier structure is associated with the subtropical jet, the northern branch crosses the Atlantic toward Scandinavia, and the southern branch tends toward North Africa. The Antarctic Oscillation is shown to influence whether the subvortex region is isolated from midlatitudes. Article in Journal/Newspaper Antarc* Antarctic North Atlantic North Atlantic oscillation Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic The Antarctic Pacific Journal of the Atmospheric Sciences 66 12 3695 3706 |