Naslov
Gravity waves excited during a minor sudden stratospheric warming

Autori
Dörnbrack, Andreas ; Gisinger, Sonja ; Kaifler, Natalie ; Portele, Tanja Christina ; Bramberger, Martina ; Rapp, Markus ; Gerding, Michale ; Söder, Jens ; Žagar, Nedjeljka ; and Jelić, Damjan

Izvornik
Atmospheric chemistry and physics (1680-7316) 18 (2018), 17; 12915-12931

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Gravity waves

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Geofizika

POVEZANOST RADA