Satellite observations of middle atmosphere gravity wave absolute momentum flux and of its vertical gradient during recent stratospheric warmings
Sudden stratospheric warmings (SSWs) are circulation anomalies in the polar region during winter. They mostly occur in the Northern Hemisphere and affect also surface weather and climate. Both planetary waves and gravity waves contribute to the onset and evolution of SSWs. While the role of planetar...
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ftfzjuelichnvdb:oai:juser.fz-juelich.de:823849 2023-05-15T18:02:17+02:00 Satellite observations of middle atmosphere gravity wave absolute momentum flux and of its vertical gradient during recent stratospheric warmings Ern, Manfred Trinh, Quang Thai Schwartz, Michael J. Riese, Martin Kaufmann, Martin Krisch, Isabell Preusse, Peter Ungermann, Jörn Zhu, Yajun Gille, John C. Mlynczak, Martin G. Russell III, James M. DE 2016 https://juser.fz-juelich.de/record/823849 https://juser.fz-juelich.de/search?p=id:%22FZJ-2016-06489%22 eng eng EGU info:eu-repo/semantics/altIdentifier/hdl/2128/12929 info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-16-9983-2016 info:eu-repo/semantics/altIdentifier/issn/1680-7316 info:eu-repo/semantics/altIdentifier/issn/1680-7324 info:eu-repo/semantics/altIdentifier/wos/WOS:000383144600002 https://juser.fz-juelich.de/record/823849 https://juser.fz-juelich.de/search?p=id:%22FZJ-2016-06489%22 info:eu-repo/semantics/openAccess Atmospheric chemistry and physics 16(15), 9983 - 10019 (2016). doi:10.5194/acp-16-9983-2016 info:eu-repo/classification/ddc/550 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftfzjuelichnvdb https://doi.org/10.5194/acp-16-9983-2016 2022-10-02T22:17:00Z Sudden stratospheric warmings (SSWs) are circulation anomalies in the polar region during winter. They mostly occur in the Northern Hemisphere and affect also surface weather and climate. Both planetary waves and gravity waves contribute to the onset and evolution of SSWs. While the role of planetary waves for SSW evolution has been recognized, the effect of gravity waves is still not fully understood, and has not been comprehensively analyzed based on global observations. In particular, information on the gravity wave driving of the background winds during SSWs is still missing.We investigate the boreal winters from 2001/2002 until 2013/2014. Absolute gravity wave momentum fluxes and gravity wave dissipation (potential drag) are estimated from temperature observations of the satellite instruments HIRDLS and SABER. In agreement with previous work, we find that sometimes gravity wave activity is enhanced before or around the central date of major SSWs, particularly during vortex-split events. Often, SSWs are associated with polar-night jet oscillation (PJO) events. For these events, we find that gravity wave activity is strongly suppressed when the wind has reversed from eastward to westward (usually after the central date of a major SSW). In addition, gravity wave potential drag at the bottom of the newly forming eastward-directed jet is remarkably weak, while considerable potential drag at the top of the jet likely contributes to the downward propagation of both the jet and the new elevated stratopause. During PJO events, we also find some indication for poleward propagation of gravity waves. Another striking finding is that obviously localized gravity wave sources, likely mountain waves and jet-generated gravity waves, play an important role during the evolution of SSWs and potentially contribute to the triggering of SSWs by preconditioning the shape of the polar vortex. The distribution of these hot spots is highly variable and strongly depends on the zonal and meridional shape of the background wind field, ... Article in Journal/Newspaper polar night Forschungszentrum Jülich: JuSER (Juelich Shared Electronic Resources) Atmospheric Chemistry and Physics 16 15 9983 10019 |
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Forschungszentrum Jülich: JuSER (Juelich Shared Electronic Resources) |
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language |
English |
topic |
info:eu-repo/classification/ddc/550 |
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info:eu-repo/classification/ddc/550 Ern, Manfred Trinh, Quang Thai Schwartz, Michael J. Riese, Martin Kaufmann, Martin Krisch, Isabell Preusse, Peter Ungermann, Jörn Zhu, Yajun Gille, John C. Mlynczak, Martin G. Russell III, James M. Satellite observations of middle atmosphere gravity wave absolute momentum flux and of its vertical gradient during recent stratospheric warmings |
topic_facet |
info:eu-repo/classification/ddc/550 |
description |
Sudden stratospheric warmings (SSWs) are circulation anomalies in the polar region during winter. They mostly occur in the Northern Hemisphere and affect also surface weather and climate. Both planetary waves and gravity waves contribute to the onset and evolution of SSWs. While the role of planetary waves for SSW evolution has been recognized, the effect of gravity waves is still not fully understood, and has not been comprehensively analyzed based on global observations. In particular, information on the gravity wave driving of the background winds during SSWs is still missing.We investigate the boreal winters from 2001/2002 until 2013/2014. Absolute gravity wave momentum fluxes and gravity wave dissipation (potential drag) are estimated from temperature observations of the satellite instruments HIRDLS and SABER. In agreement with previous work, we find that sometimes gravity wave activity is enhanced before or around the central date of major SSWs, particularly during vortex-split events. Often, SSWs are associated with polar-night jet oscillation (PJO) events. For these events, we find that gravity wave activity is strongly suppressed when the wind has reversed from eastward to westward (usually after the central date of a major SSW). In addition, gravity wave potential drag at the bottom of the newly forming eastward-directed jet is remarkably weak, while considerable potential drag at the top of the jet likely contributes to the downward propagation of both the jet and the new elevated stratopause. During PJO events, we also find some indication for poleward propagation of gravity waves. Another striking finding is that obviously localized gravity wave sources, likely mountain waves and jet-generated gravity waves, play an important role during the evolution of SSWs and potentially contribute to the triggering of SSWs by preconditioning the shape of the polar vortex. The distribution of these hot spots is highly variable and strongly depends on the zonal and meridional shape of the background wind field, ... |
format |
Article in Journal/Newspaper |
author |
Ern, Manfred Trinh, Quang Thai Schwartz, Michael J. Riese, Martin Kaufmann, Martin Krisch, Isabell Preusse, Peter Ungermann, Jörn Zhu, Yajun Gille, John C. Mlynczak, Martin G. Russell III, James M. |
author_facet |
Ern, Manfred Trinh, Quang Thai Schwartz, Michael J. Riese, Martin Kaufmann, Martin Krisch, Isabell Preusse, Peter Ungermann, Jörn Zhu, Yajun Gille, John C. Mlynczak, Martin G. Russell III, James M. |
author_sort |
Ern, Manfred |
title |
Satellite observations of middle atmosphere gravity wave absolute momentum flux and of its vertical gradient during recent stratospheric warmings |
title_short |
Satellite observations of middle atmosphere gravity wave absolute momentum flux and of its vertical gradient during recent stratospheric warmings |
title_full |
Satellite observations of middle atmosphere gravity wave absolute momentum flux and of its vertical gradient during recent stratospheric warmings |
title_fullStr |
Satellite observations of middle atmosphere gravity wave absolute momentum flux and of its vertical gradient during recent stratospheric warmings |
title_full_unstemmed |
Satellite observations of middle atmosphere gravity wave absolute momentum flux and of its vertical gradient during recent stratospheric warmings |
title_sort |
satellite observations of middle atmosphere gravity wave absolute momentum flux and of its vertical gradient during recent stratospheric warmings |
publisher |
EGU |
publishDate |
2016 |
url |
https://juser.fz-juelich.de/record/823849 https://juser.fz-juelich.de/search?p=id:%22FZJ-2016-06489%22 |
op_coverage |
DE |
genre |
polar night |
genre_facet |
polar night |
op_source |
Atmospheric chemistry and physics 16(15), 9983 - 10019 (2016). doi:10.5194/acp-16-9983-2016 |
op_relation |
info:eu-repo/semantics/altIdentifier/hdl/2128/12929 info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-16-9983-2016 info:eu-repo/semantics/altIdentifier/issn/1680-7316 info:eu-repo/semantics/altIdentifier/issn/1680-7324 info:eu-repo/semantics/altIdentifier/wos/WOS:000383144600002 https://juser.fz-juelich.de/record/823849 https://juser.fz-juelich.de/search?p=id:%22FZJ-2016-06489%22 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-16-9983-2016 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
16 |
container_issue |
15 |
container_start_page |
9983 |
op_container_end_page |
10019 |
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1766172101298880512 |