Rossby Wave Propagation into the Northern Hemisphere Stratosphere: The Role of Zonal Phase Speed

Domeisen, Daniela I. V.; Martius, Olivia; Jiménez-Esteve, Bernat (2018). Rossby Wave Propagation into the Northern Hemisphere Stratosphere: The Role of Zonal Phase Speed. Geophysical Research Letters, 45(4), pp. 2064-2071. American Geophysical Union 10.1002/2017GL076886

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Sudden stratospheric warming (SSW) events are to a dominant part induced by upward propagating planetary waves. While theory predicts that the zonal phase speed of a tropospheric wave forcing affects wave propagation into the stratosphere, its relevance for SSW events has so far not been considered. This study shows in a linear wave diagnostic and in reanalysis data that phase speeds tend eastward as waves propagate upward, indicating that the stratosphere preselects eastward phase speeds for propagation, especially for zonal wave number 2. This also affects SSW events: Split SSW events tend to be preceded by anomalously eastward zonal phase speeds. Zonal phase speed may indeed explain part of the increased wave flux observed during the preconditioning of SSW events, as, for example, for the record 2009 SSW event.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Impact
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geography
08 Faculty of Science > Institute of Geography > Physical Geography

UniBE Contributor:

Romppainen-Martius, Olivia

Subjects:

900 History > 910 Geography & travel
500 Science > 550 Earth sciences & geology

ISSN:

0094-8276

Publisher:

American Geophysical Union

Language:

English

Submitter:

Hélène Christine Louise Barras

Date Deposited:

03 May 2018 08:45

Last Modified:

01 Sep 2018 02:31

Publisher DOI:

10.1002/2017GL076886

BORIS DOI:

10.7892/boris.112224

URI:

https://boris.unibe.ch/id/eprint/112224

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