Quasi-periodic variations of the polar vortex in the Southern Hemisphere stratosphere due to wave-wave interaction

HIO, Yasuko ; YODEN, Shigeo

In: Journal of the atmospheric sciences, Jg. 61 (2004), Heft 21, S. 2510-2527

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The winter polar vortex in the Southern Hemisphere stratosphere is characterized by prominent quasi-stationary planetary waves: zonal wavenumber 1 (wave 1) and the eastward-traveling wave (wave 2). Quasi-periodic variations of the polar vortex are investigated in terms of the wave-wave interaction between wave 1 and wave 2 with both the NCEP-NCAR reanalysis dataset from 1979 to 2002 and a spherical barotropic model. A typical case shows that the transient wave 1 generated by the wave-wave interaction has comparable amplitude to those of the stationary wave I and the traveling wave 2, and has a node around 60°S, where these primary waves have large amplitude. The transient wave 1 travels eastward with the same angular frequency as that of the traveling wave 2. The polar night jet also vacillates with the same frequency such that it has its minimum when the stationary wave 1 and the transient wave I are in phase at the polar side of the node. The vacillation is basically due to quasi-periodic variations of the wave driven by the interference between the stationary and traveling wave 1s. Similar periodic variations of the polar vortex are obtained in the model experiment here, in the circumstance that stationary wave 1 generated by surface topography has comparable amplitude to the eastward-traveling wave 2 that is generated by the barotropic instability of a forced mean zonal wind. The winter polar vortex shows large interannual variability. Similar quasi-periodic variations due to wave-wave interaction often occurred for the 24 yr in late winter when the transient wave 2 was vigorous.

Titel:	Quasi-periodic variations of the polar vortex in the Southern Hemisphere stratosphere due to wave-wave interaction
Autor/in / Beteiligte Person:	HIO, Yasuko ; YODEN, Shigeo
Link:	Volltext (PDF) View record from PASCAL Archive
Zeitschrift:	Journal of the atmospheric sciences, Jg. 61 (2004), Heft 21, S. 2510-2527
Veröffentlichung:	Boston, MA: American Meteorological Society, 2004
Medientyp:	academicJournal
Umfang:	print, 35 ref
ISSN:	0022-4928 (print)
Schlagwort:	Climatology, meteorology Climatologie, météorologie Sciences exactes et technologie Exact sciences and technology Terre, ocean, espace Earth, ocean, space Geophysique externe External geophysics Météorologie Meteorology Dynamique atmosphérique Atmospheric dynamics Dinámica atmosférica Hiver Winter Invierno Hémisphère Sud Southern Hemisphere Hemisferio sur Instabilité barotrope Barotropic instability Inestabilidad barotrópica Interaction onde Wave interaction Interacción onda Mode barotrope Barotropic mode Modo barotropo Modèle sphérique spherical models Nuit Night Noche Onde planétaire Planetary wave Onda planetaria Phénomène transitoire transient phenomena Stratosphère stratosphere Estratosfera Topographie topography Topografía Tourbillon polaire Polar vortex Vórtice polar Variation interannuelle Interannual variation Variación interanual Variation périodique Periodic variation Variación periódica Variation quasi périodique Quasi periodic variation Variación semiperiódica Vent zonal Zonal wind Viento zonal
Sonstiges:	Nachgewiesen in: PASCAL Archive Sprachen: English Original Material: INIST-CNRS Document Type: Article File Description: text Language: English Author Affiliations: Department of Geophysics, Kyoto University, Kyoto, Japan Rights: Copyright 2005 INIST-CNRS ; CC BY 4.0 ; Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d’une licence CC BY 4.0 Inist-CNRS / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 licence by Inist-CNRS / A menos que se haya señalado antes, el contenido de este registro bibliográfico puede ser utilizado al amparo de una licencia CC BY 4.0 Inist-CNRS Notes: External geophysics

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