This title appears in the Scientific Report :
2023
Please use the identifier:
http://hdl.handle.net/2128/34591 in citations.
Please use the identifier: http://dx.doi.org/10.1175/JAS-D-22-0151.1 in citations.
Sensitivity of mountain wave drag estimates on separation methods and proposed improvements
Sensitivity of mountain wave drag estimates on separation methods and proposed improvements
Internal gravity waves (GWs) are ubiquitous in the atmosphere, making significant contributions to the mesoscale motions. Since the majority of their spectrum is unresolved in global circulation models, their effects need to be parameterized. In recent decades GWs have been increasingly studied in h...
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Personal Name(s): | Procházková, Zuzana (Corresponding author) |
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Kruse, Christopher G. / Alexander, M. Joan / Hoffmann, Lars / Bacmeister, Julio T. / Holt, Laura / Wright, Corwin / Sato, Kaoru / Gisinger, Sonja / Ern, Manfred / Geldenhuys, Markus / Preusse, Peter / Šácha, Petr | |
Contributing Institute: |
Jülich Supercomputing Center; JSC Stratosphäre; IEK-7 |
Published in: | Journal of the atmospheric sciences, 80 (2023) 7, S. 1661–1680 |
Imprint: |
Boston, Mass.
American Meteorological Soc.
2023
|
DOI: |
10.1175/JAS-D-22-0151.1 |
Document Type: |
Journal Article |
Research Program: |
Domain-Specific Simulation & Data Life Cycle Labs (SDLs) and Research Groups Climate Feedbacks |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1175/JAS-D-22-0151.1 in citations.
Internal gravity waves (GWs) are ubiquitous in the atmosphere, making significant contributions to the mesoscale motions. Since the majority of their spectrum is unresolved in global circulation models, their effects need to be parameterized. In recent decades GWs have been increasingly studied in high-resolution simulations, which, unlike direct observations, allow us to explore full spatiotemporal variations of the resolved wave field. In our study we analyze and refine a traditional method for GW analysis in a high-resolution simulation on a regional domain around the Drake Passage. We show that GW momentum drag estimates based on the Gaussian high-pass filter method applied to separate GW perturbations from the background are sensitive to the choice of a cutoff parameter. The impact of the cutoff parameter is higher for horizontal fluxes of horizontal momentum, which indicates higher sensitivity for horizontally propagating waves. Two modified methods, which choose the parameter value from spectral information, are proposed. The dynamically determined cutoff is mostly higher than the traditional cutoff values around 500 km, leading to larger GW fluxes and drag, and varies with time and altitude. The differences between the traditional and the modified methods are especially pronounced during events with significant drag contributions from horizontal momentum fluxes |