Interannual variability in the gravity wave drag – vertical coupling and possible climate links
Gravity wave drag (GWD) is an important driver of the middle atmospheric dynamics. However, there are almost no observational constraints on its strength and distribution (especially horizontal). In this study we analyze orographic GWD (OGWD) output from Canadian Middle Atmosphere Model simulation w...
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ftcopernicus:oai:publications.copernicus.org:esd65983 2023-05-15T17:33:09+02:00 Interannual variability in the gravity wave drag – vertical coupling and possible climate links Šácha, Petr Miksovsky, Jiri Pisoft, Petr 2019-01-04 application/pdf https://doi.org/10.5194/esd-9-647-2018 https://esd.copernicus.org/articles/9/647/2018/ eng eng doi:10.5194/esd-9-647-2018 https://esd.copernicus.org/articles/9/647/2018/ eISSN: 2190-4987 Text 2019 ftcopernicus https://doi.org/10.5194/esd-9-647-2018 2020-07-20T16:23:18Z Gravity wave drag (GWD) is an important driver of the middle atmospheric dynamics. However, there are almost no observational constraints on its strength and distribution (especially horizontal). In this study we analyze orographic GWD (OGWD) output from Canadian Middle Atmosphere Model simulation with specified dynamics (CMAM-sd) to illustrate the interannual variability in the OGWD distribution at particular pressure levels in the stratosphere and its relation to major climate oscillations. We have found significant changes in the OGWD distribution and strength depending on the phase of the North Atlantic Oscillation (NAO), quasi-biennial oscillation (QBO) and El Niño–Southern Oscillation. The OGWD variability is shown to be induced by lower-tropospheric wind variations to a large extent, and there is also significant variability detected in near-surface momentum fluxes. We argue that the orographic gravity waves (OGWs) and gravity waves (GWs) in general can be a quick mediator of the tropospheric variability into the stratosphere as the modifications of the OGWD distribution can result in different impacts on the stratospheric dynamics during different phases of the studied climate oscillations. Text North Atlantic North Atlantic oscillation Copernicus Publications: E-Journals Earth System Dynamics 9 2 647 661 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Gravity wave drag (GWD) is an important driver of the middle atmospheric dynamics. However, there are almost no observational constraints on its strength and distribution (especially horizontal). In this study we analyze orographic GWD (OGWD) output from Canadian Middle Atmosphere Model simulation with specified dynamics (CMAM-sd) to illustrate the interannual variability in the OGWD distribution at particular pressure levels in the stratosphere and its relation to major climate oscillations. We have found significant changes in the OGWD distribution and strength depending on the phase of the North Atlantic Oscillation (NAO), quasi-biennial oscillation (QBO) and El Niño–Southern Oscillation. The OGWD variability is shown to be induced by lower-tropospheric wind variations to a large extent, and there is also significant variability detected in near-surface momentum fluxes. We argue that the orographic gravity waves (OGWs) and gravity waves (GWs) in general can be a quick mediator of the tropospheric variability into the stratosphere as the modifications of the OGWD distribution can result in different impacts on the stratospheric dynamics during different phases of the studied climate oscillations. |
format |
Text |
author |
Šácha, Petr Miksovsky, Jiri Pisoft, Petr |
spellingShingle |
Šácha, Petr Miksovsky, Jiri Pisoft, Petr Interannual variability in the gravity wave drag – vertical coupling and possible climate links |
author_facet |
Šácha, Petr Miksovsky, Jiri Pisoft, Petr |
author_sort |
Šácha, Petr |
title |
Interannual variability in the gravity wave drag – vertical coupling and possible climate links |
title_short |
Interannual variability in the gravity wave drag – vertical coupling and possible climate links |
title_full |
Interannual variability in the gravity wave drag – vertical coupling and possible climate links |
title_fullStr |
Interannual variability in the gravity wave drag – vertical coupling and possible climate links |
title_full_unstemmed |
Interannual variability in the gravity wave drag – vertical coupling and possible climate links |
title_sort |
interannual variability in the gravity wave drag – vertical coupling and possible climate links |
publishDate |
2019 |
url |
https://doi.org/10.5194/esd-9-647-2018 https://esd.copernicus.org/articles/9/647/2018/ |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
eISSN: 2190-4987 |
op_relation |
doi:10.5194/esd-9-647-2018 https://esd.copernicus.org/articles/9/647/2018/ |
op_doi |
https://doi.org/10.5194/esd-9-647-2018 |
container_title |
Earth System Dynamics |
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9 |
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2 |
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647 |
op_container_end_page |
661 |
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1766131560784855040 |