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Observed versus simulated mountain waves over Scandinavia - improvement of vertical winds, energy and momentum fluxes by enhanced model resolution?

Wagner, Johannes and Dörnbrack, Andreas and Rapp, Markus and Gisinger, Sonja and Ehard, Benedikt and Bramberger, Martina and Witschas, Benjamin and Chouza, Fernando and Rahm, Stephan and Mallaun, Christian and Baumgarten, Gerd and Hoor, Peter (2017) Observed versus simulated mountain waves over Scandinavia - improvement of vertical winds, energy and momentum fluxes by enhanced model resolution? Atmospheric Chemistry and Physics, 17, pp. 4031-4052. Copernicus Publications. DOI: 10.5194/acp-17-4031-2017 ISSN 1680-7316

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Official URL: http://www.atmos-chem-phys.net/17/4031/2017/

Abstract

Two mountain wave events, which occurred over northern Scandinavia in December 2013 are analysed by means of airborne observations and global and mesoscale numerical simulations with horizontal mesh sizes of 16, 7.2, 2.4 and 0.8 km. During both events westerly cross-mountain flow induced upward-propagating mountain waves with different wave characteristics due to differing atmospheric background conditions. While wave breaking occurred at altitudes between 25 and 30 km during the first event due to weak stratospheric winds, waves propagated to altitudes above 30 km and interfacial waves formed in the troposphere at a stratospheric intrusion layer during the second event. Global and mesoscale simulations with 16 and 7.2 km grid sizes were not able to simulate the amplitudes and wavelengths of the mountain waves correctly due to unresolved mountain peaks. In simulations with 2.4 and 0.8 km horizontal resolution, mountain waves with horizontal wavelengths larger than 15 km were resolved, but exhibited too small amplitudes and too high energy and momentum fluxes. Simulated fluxes could be reduced by either increasing the vertical model grid resolution or by enhancing turbulent diffusion in the model, which is comparable to an improved representation of small-scale nonlinear wave effects.

Item URL in elib:https://elib.dlr.de/106202/
Document Type:Article
Title:Observed versus simulated mountain waves over Scandinavia - improvement of vertical winds, energy and momentum fluxes by enhanced model resolution?
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wagner, JohannesDLR, IPAUNSPECIFIED
Dörnbrack, AndreasDLR, IPAUNSPECIFIED
Rapp, MarkusDLR, IPAUNSPECIFIED
Gisinger, SonjaDLR, IPAUNSPECIFIED
Ehard, BenediktDLR, IPAUNSPECIFIED
Bramberger, MartinaDLR, IPAUNSPECIFIED
Witschas, BenjaminDLR, IPAUNSPECIFIED
Chouza, FernandoDLR, IPAUNSPECIFIED
Rahm, StephanDLR, IPAUNSPECIFIED
Mallaun, ChristianDLR, FXUNSPECIFIED
Baumgarten, GerdIAP, KühlungsbornUNSPECIFIED
Hoor, PeterUni MainzUNSPECIFIED
Date:March 2017
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:17
DOI :10.5194/acp-17-4031-2017
Page Range:pp. 4031-4052
Publisher:Copernicus Publications
ISSN:1680-7316
Status:Published
Keywords:GW-LCYCLE I, gravity waves, numerical modeling, airborne observations
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Institute of Atmospheric Physics
Institute of Atmospheric Physics > Lidar
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Deposited By: Wagner, Johannes
Deposited On:23 Sep 2016 09:50
Last Modified:02 May 2019 14:05

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  • Observed versus simulated mountain waves over Scandinavia - improvement of vertical winds, energy and momentum fluxes by enhanced model resolution? (deposited 23 Sep 2016 09:50) [Currently Displayed]

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