An exceptionally deep upper-air sounding launched from Kiruna airport (67.82◦ N, 20.33◦ E) on 30 January 2016 stimulated the current investigation of internal gravity waves excited during a minor sudden stratospheric warming (SSW) in the Arctic winter 2015/16. The analysis of the radiosonde profile revealed large kinetic and potential energies in the upper stratosphere without any simultaneous enhancement of upper tropospheric and lower stratospheric values. Upward-propagating inertia-gravity waves in the upper stratosphere and downward-propagating modes in the lower stratosphere indicated a region of gravity wave Generation in the stratosphere. Two-dimensional wavelet analysis was applied to vertical time series of temperature fluctuations in order to determine the vertical propagation direction of the stratospheric gravity waves in 1-hourly high-resolution meteorological analyses and short-term forecasts. The separation of upward- and downward-propagating waves provided further evidence for a stratospheric source of gravity waves. The scale-dependent decomposition of the flow into a balanced component and inertia-gravity waves showed that coherent wave packets preferentially occurred at the inner edge of the Arctic polar vortex where a sub-vortex formed during the minor SSW.


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    Titel :

    Gravity waves excited during a minor sudden stratospheric warming


    Beteiligte:
    Dörnbrack, Andreas (Autor:in) / Gisinger, Sonja (Autor:in) / Kaifler, Natalie (Autor:in) / Portele, Tanja (Autor:in) / Bramberger, Martina (Autor:in) / Rapp, Markus (Autor:in) / Gerding, Michael (Autor:in) / Söder, Jens (Autor:in) / Zagar, Nedjeljka (Autor:in) / Jelic, Damjan (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2018



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Deutsch






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