The Hiccup: a dynamical coupling process during the autumn transition in the Northern Hemisphere – similarities and differences to sudden stratospheric warmings
Sudden stratospheric warmings (SSWs) are the most prominent vertical coupling process in the middle atmosphere, which occur during winter and are caused by the interaction of planetary waves (PWs) with the zonal mean flow. Vertical coupling has also been identified during the equinox transitions, an...
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Online Access: | http://elib.dlr.de/95400/ http://elib.dlr.de/95400/1/Alet-Rapp-angeo2015.pdf https://doi.org/10.5194/angeo-33-199-2015 |
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ftdlr:oai:elib.dlr.de:95400 2023-05-15T13:25:16+02:00 The Hiccup: a dynamical coupling process during the autumn transition in the Northern Hemisphere – similarities and differences to sudden stratospheric warmings Matthias, V. Shepherd, Theodore G. Hoffmann, P. Rapp, Markus 2015 application/pdf http://elib.dlr.de/95400/ http://elib.dlr.de/95400/1/Alet-Rapp-angeo2015.pdf https://doi.org/10.5194/angeo-33-199-2015 de ger Copernicus Publications http://elib.dlr.de/95400/1/Alet-Rapp-angeo2015.pdf Matthias, V. und Shepherd, Theodore G. und Hoffmann, P. und Rapp, Markus (2015) The Hiccup: a dynamical coupling process during the autumn transition in the Northern Hemisphere – similarities and differences to sudden stratospheric warmings. Annales Geophysicae, 33 (2), Seiten 199-206. Copernicus Publications. DOI:10.5194/angeo-33-199-2015 ISSN 0992-7689 Institut für Physik der Atmosphäre Zeitschriftenbeitrag PeerReviewed 2015 ftdlr https://doi.org/10.5194/angeo-33-199-2015 2018-03-11T23:51:47Z Sudden stratospheric warmings (SSWs) are the most prominent vertical coupling process in the middle atmosphere, which occur during winter and are caused by the interaction of planetary waves (PWs) with the zonal mean flow. Vertical coupling has also been identified during the equinox transitions, and is similarly associated with PWs. We argue that there is a characteristic aspect of the autumn transition in northern high latitudes, which we call the “hiccup”, and which acts like a “mini SSW”, i.e. like a small minor warming. We study the average characteristics of the hiccup based on a superimposed epoch analysis using a nudged version of the Canadian Middle Atmosphere Model, representing 30 years of historical data. Hiccups can be identified in about half the years studied. The mesospheric zonal wind results are compared to radar observations over Andenes (69� N, 16� E) for the years 2000–2013. A comparison of the average characteristics of hiccups and SSWs shows both similarities and differences between the two vertical coupling processes. Other Non-Article Part of Journal/Newspaper Andenes German Aerospace Center: elib - DLR electronic library Annales Geophysicae 33 2 199 206 |
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German Aerospace Center: elib - DLR electronic library |
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German |
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Institut für Physik der Atmosphäre |
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Institut für Physik der Atmosphäre Matthias, V. Shepherd, Theodore G. Hoffmann, P. Rapp, Markus The Hiccup: a dynamical coupling process during the autumn transition in the Northern Hemisphere – similarities and differences to sudden stratospheric warmings |
topic_facet |
Institut für Physik der Atmosphäre |
description |
Sudden stratospheric warmings (SSWs) are the most prominent vertical coupling process in the middle atmosphere, which occur during winter and are caused by the interaction of planetary waves (PWs) with the zonal mean flow. Vertical coupling has also been identified during the equinox transitions, and is similarly associated with PWs. We argue that there is a characteristic aspect of the autumn transition in northern high latitudes, which we call the “hiccup”, and which acts like a “mini SSW”, i.e. like a small minor warming. We study the average characteristics of the hiccup based on a superimposed epoch analysis using a nudged version of the Canadian Middle Atmosphere Model, representing 30 years of historical data. Hiccups can be identified in about half the years studied. The mesospheric zonal wind results are compared to radar observations over Andenes (69� N, 16� E) for the years 2000–2013. A comparison of the average characteristics of hiccups and SSWs shows both similarities and differences between the two vertical coupling processes. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Matthias, V. Shepherd, Theodore G. Hoffmann, P. Rapp, Markus |
author_facet |
Matthias, V. Shepherd, Theodore G. Hoffmann, P. Rapp, Markus |
author_sort |
Matthias, V. |
title |
The Hiccup: a dynamical coupling process during the autumn transition in the Northern Hemisphere – similarities and differences to sudden stratospheric warmings |
title_short |
The Hiccup: a dynamical coupling process during the autumn transition in the Northern Hemisphere – similarities and differences to sudden stratospheric warmings |
title_full |
The Hiccup: a dynamical coupling process during the autumn transition in the Northern Hemisphere – similarities and differences to sudden stratospheric warmings |
title_fullStr |
The Hiccup: a dynamical coupling process during the autumn transition in the Northern Hemisphere – similarities and differences to sudden stratospheric warmings |
title_full_unstemmed |
The Hiccup: a dynamical coupling process during the autumn transition in the Northern Hemisphere – similarities and differences to sudden stratospheric warmings |
title_sort |
hiccup: a dynamical coupling process during the autumn transition in the northern hemisphere – similarities and differences to sudden stratospheric warmings |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
http://elib.dlr.de/95400/ http://elib.dlr.de/95400/1/Alet-Rapp-angeo2015.pdf https://doi.org/10.5194/angeo-33-199-2015 |
genre |
Andenes |
genre_facet |
Andenes |
op_relation |
http://elib.dlr.de/95400/1/Alet-Rapp-angeo2015.pdf Matthias, V. und Shepherd, Theodore G. und Hoffmann, P. und Rapp, Markus (2015) The Hiccup: a dynamical coupling process during the autumn transition in the Northern Hemisphere – similarities and differences to sudden stratospheric warmings. Annales Geophysicae, 33 (2), Seiten 199-206. Copernicus Publications. DOI:10.5194/angeo-33-199-2015 ISSN 0992-7689 |
op_doi |
https://doi.org/10.5194/angeo-33-199-2015 |
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Annales Geophysicae |
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199 |
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