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• 04/03/2025 - Markus HOLZNER: "TBA"

  Markus HOLZNER (BOKU University Vienna)

  Abstract will follow.

  Tuesday, 16:45h - 18:15h

  Location: Room 2F513, (Exner-Raum), Josef-Holaubek-Platz 2, UZA 2, 1090 Vienna and online!
• 18/03/2025 - Andreas DÖRNBRACK: "Transient tropopause waves"

  Andreas DÖRNBRACK (DLR, Deutsches Zentrum für Luft- und Raumfahrt)

  Flight-level airborne observations have often detected gravity waves with horizontal wavelengths λx≲10km near the tropopause. Here, in situ and remote sensing aircraft data of these short gravity waves trapped along tropopause inversion layer and collected during a mountain-wave event over southern Scandinavia are analyzed to quantify their spectral energy and energy fluxes and to identify nonstationary modes. A series of three-dimensional numerical simulations are performed to explain the origin of these transient wave modes and to investigate the parameters on which they depend. It turns out that mountain-wave breaking in the middle atmosphere and the subsequent modification of the stratospheric flow are the key factors for the occurrence of trapped modes with λx≲10km. In particular, the intermittent and periodic breaking of mountain waves in the lower stratosphere forms a wave duct directly above the tropopause, in which the short gravity waves are trapped. The characteristics of the trapped, downstream-propagating waves are mainly controlled by the sharpness of the tropopause inversion layer. It could be demonstrated that different settings for optimizing the numerical solver have a significantly smaller influence on the solutions.

  Tuesday, 16:45h - 18:15h

  Location: Room 2F513, (Exner-Raum), Josef-Holaubek-Platz 2, UZA 2, 1090 Vienna and online!
• 25/03/2025 - Ulrike ROMATSCHKE: "TBA"

  Ulrike ROMATSCHKE (NCAR)

  Abstract will follow.
  

  Tuesday, 16:45h - 18:15h

  Location: Room 2F513, (Exner-Raum), Josef-Holaubek-Platz 2, UZA 2, 1090 Vienna and online!
• 08/04/2025 - Steve SHERWOOD: "TBA"

  Steve SHERWOOD (UNSW Climate Change Research Centre)

  Abstract will follow.

   

  Tuesday, 16:45h - 18:15h

  Location: Room 2F513, (Exner-Raum), Josef-Holaubek-Platz 2, UZA 2, 1090 Vienna and online!
• 06/05/2025 - Takemasa MIYOSHI: "TBA"

  Takemasa MIYOSHI (RIKEN Center for Computational Science)

  Abstract will follow.
  

  Tuesday, 16:45h - 18:15h

  Location: Room 2F513, (Exner-Raum), Josef-Holaubek-Platz 2, UZA 2, 1090 Vienna and online!