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Sensitivity of mountain wave drag estimates on separation methods and proposed improvements

Procházková, Zuzana and Kruse, Christopher G. and Alexander, M. Joan and Hoffmann, Lars and Bacmeister, Julio and Holt, Laura and Wright, Corwin J. and Sato, Kaoru and Gisinger, Sonja and Ern, Manfred and Geldenhuys, Markus and Preusse, Peter and Sacha, Petr (2023) Sensitivity of mountain wave drag estimates on separation methods and proposed improvements. Journal of the Atmospheric Sciences, pp. 1-46. American Meteorological Society. doi: 10.1175/JAS-D-22-0151.1. ISSN 0022-4928.

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Official URL: https://journals.ametsoc.org/view/journals/atsc/aop/JAS-D-22-0151.1/JAS-D-22-0151.1.xml


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 spatio-temporal 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.

Item URL in elib:https://elib.dlr.de/194685/
Document Type:Article
Title:Sensitivity of mountain wave drag estimates on separation methods and proposed improvements
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Procházková, ZuzanaCharles University, Prague, CRUNSPECIFIEDUNSPECIFIED
Kruse, Christopher G.CoRA Office, Boulder, CO, USAUNSPECIFIEDUNSPECIFIED
Hoffmann, LarsFZ Jülich, Jülich, Germanyhttps://orcid.org/0000-0003-3773-4377UNSPECIFIED
Holt, LauraCoRA Office, NorthWest Research Associates, Boulder, ColoradoUNSPECIFIEDUNSPECIFIED
Wright, Corwin J.University of Bath, Bath, UKhttps://orcid.org/0000-0003-2496-953XUNSPECIFIED
Sato, KaoruUniversiy of Tokyo, JapanUNSPECIFIEDUNSPECIFIED
Gisinger, SonjaDLR, IPAhttps://orcid.org/0000-0001-8188-4458UNSPECIFIED
Ern, ManfredFZ Jülich, Jülich, Germanyhttps://orcid.org/0000-0002-8565-2125UNSPECIFIED
Geldenhuys, MarkusFZ Jülich, Jülich, Germanyhttps://orcid.org/0000-0001-6273-5633UNSPECIFIED
Preusse, PeterFZ Jülich, Jülich, GermanyUNSPECIFIEDUNSPECIFIED
Sacha, PetrCharles University, Prague, CRUNSPECIFIEDUNSPECIFIED
Date:3 April 2023
Journal or Publication Title:Journal of the Atmospheric Sciences
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-46
Publisher:American Meteorological Society
Keywords:Gravity Waves, weather model
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Middle Atmosphere
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Gisinger, Sonja
Deposited On:14 Apr 2023 12:33
Last Modified:14 Apr 2023 12:33

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