EGU22-3884
https://doi.org/10.5194/egusphere-egu22-3884
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Detection of internal gravity waves by high-pass filtering

Zuzana Procházková1, Christopher Kruse2, Aleš Kuchař3, Petr Pišoft1, and Petr Šácha1,4
Zuzana Procházková et al.
  • 1Charles Univesity, Faculty of Mathematics and Physics, Department of Atmospheric Physics, Prague 2, Czechia (zuza.proch@gmail.com)
  • 2Climate and Global Dynamics (CGD) and Mesoscale and Microscale Meteorology (MMM) laboratories, NCAR, Boulder, USA
  • 3Institute for Meteorology, Universität Leipzig, Leipzig, Germany
  • 4Institute of Meteorology, University of Natural Resources and Life Sciences, Vienna (BOKU), Vienna, Austria

Terrestrial atmosphere supports propagation of various wave types. An important component of the dynamics especially in the middle atmosphere are the internal gravity waves (GWs) that are incessantly being generated from initial perturbations in a stably stratified atmosphere. Horizontal GW wavelengths range from a few to thousands of kilometres. Together with a wide range of temporal and vertical scales, this complicates their global observations and modeling, requiring high resolution model simulations. Subsequent analyses, nevertheless, contain a significant margin of uncertainty originating in the separation of GWs from the background flow, which is often performed by statistical means. In our work, we explore properties of a Gaussian high-pass filter method, using a deep WRF simulation with the horizontal resolution of 3 km in the region of the Drake Passage. Due to the revealed sensitivity of momentum flux and drag estimates to a filter cutoff parameter, we propose a new method that sets the value of the parameter on the basis of the horizontal spectra of horizontal kinetic energy.

How to cite: Procházková, Z., Kruse, C., Kuchař, A., Pišoft, P., and Šácha, P.: Detection of internal gravity waves by high-pass filtering, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-3884, https://doi.org/10.5194/egusphere-egu22-3884, 2022.