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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2018-228
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
13 Mar 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Gravity Waves excited during a Minor Sudden Stratospheric Warming
Andreas Dörnbrack1, Sonja Gisinger1, Natalie Kaifler1, Tanja Portele1, Martina Bramberger1, Markus Rapp1,2, Micheal Gerding3, Jens Söder3, Nedjeljka Žagar4, and Damjan Jelić4 1Institut für Physik der Atmosphäre, DLR Oberpfaffenhofen, Oberpfaffenhofen, Germany
2Meteorologisches Institut München, Ludwig-Maximilians-Universität München, Munich, Germany
3Leibniz Institute of Atmospheric Physics at the University of Rostock, Kühlungsborn, Germany
4University of Ljubljana, Faculty of Mathematics and Physics, Department of Physics, Ljubljana, Slovenia
Abstract. An exceptionally deep upper-air sounding launched from Kiruna airport (67.82° N, 20.337° 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 one-hourly high-resolution meteorological analyses and short-term forecasts. The separation of up- 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.
Citation: Dörnbrack, A., Gisinger, S., Kaifler, N., Portele, T., Bramberger, M., Rapp, M., Gerding, M., Söder, J., Žagar, N., and Jelić, D.: Gravity Waves excited during a Minor Sudden Stratospheric Warming, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-228, in review, 2018.
Andreas Dörnbrack et al.
Andreas Dörnbrack et al.
Andreas Dörnbrack et al.

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Short summary
A deep upper-air sounding 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. In combination with high-resolution meteorological analyses we identified an elevated source of gravity wave excitation.
A deep upper-air sounding stimulated the current investigation of internal gravity waves excited...
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