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Volume 18, issue 17
Atmos. Chem. Phys., 18, 12915-12931, 2018
https://doi.org/10.5194/acp-18-12915-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: Sources, propagation, dissipation and impact of gravity waves...

Atmos. Chem. Phys., 18, 12915-12931, 2018
https://doi.org/10.5194/acp-18-12915-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 07 Sep 2018

Research article | 07 Sep 2018

Gravity waves excited during a minor sudden stratospheric warming

Andreas Dörnbrack1, Sonja Gisinger1, Natalie Kaifler1, Tanja Christina Portele1, Martina Bramberger1, Markus Rapp1,2, Michael Gerding3, Jens Söder3, Nedjeljka Žagar4, and Damjan Jelić4 Andreas Dörnbrack et al.
  • 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, 20.33°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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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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