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Vertically Propagating Mountain Waves—A Hazard for High-Flying Aircraft?

Bramberger, Martina and Dörnbrack, Andreas and Wilms, Henrike and Gemsa, Steffen and Raynor, Kevin and Sharman, Robert D. (2018) Vertically Propagating Mountain Waves—A Hazard for High-Flying Aircraft? Journal of Applied Meteorology and Climatology, 57 (9), pp. 1957-1975. American Meteorological Society. DOI: 10.1175/JAMC-D-17-0340.1 ISSN 1558-8424

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Official URL: http://dx.doi.org/10.1175/JAMC-D-17-0340.1

Abstract

Stall warnings at flight level 410 (12.5 km) occurred unexpectedly during a research flight of the High Altitude and Long Range Research Aircraft (HALO) over Italy on 12 January 2016. The dangerous flight situation was mitigated by pilot intervention. At the incident location, the stratosphere was characterized by large horizontal variations in the along-track wind speed and temperature. On this particular day, strong northwesterly winds in the lower troposphere in concert with an aligned polar front jet favored the excitation and vertical propagation of large-amplitude mountain waves at and above the Apennines in Italy. These mountain waves carried large vertical energy fluxes of 8 W m22 and propagated without significant dissipation from the troposphere into the stratosphere. While turbulence is a well-acknowledged hazard to aviation, this case study reveals that nonbreaking, vertically propagating mountain waves also pose a potential hazard, especially to high-flying aircraft. It is the wave-induced modulation of the ambient along-track wind speed that may decrease the aircraft speed toward the minimum needed stall speed.

Item URL in elib:https://elib.dlr.de/121439/
Document Type:Article
Additional Information:Please note the AMS Copyright Policy, available under https://www.ametsoc.org/ams/index.cfm/publications/ethical-guidelines-and-ams-policies/ams-copyright-policy/
Title:Vertically Propagating Mountain Waves—A Hazard for High-Flying Aircraft?
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bramberger, MartinaDLR, IPAUNSPECIFIED
Dörnbrack, AndreasDLR, IPAhttps://orcid.org/0000-0003-0936-0216
Wilms, HenrikeDLR, IPAUNSPECIFIED
Gemsa, SteffenDLR, FXUNSPECIFIED
Raynor, KevinDLR, FXUNSPECIFIED
Sharman, Robert D.NCAR, Boulder, CO, USAUNSPECIFIED
Date:2018
Journal or Publication Title:Journal of Applied Meteorology and Climatology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:57
DOI :10.1175/JAMC-D-17-0340.1
Page Range:pp. 1957-1975
Publisher:American Meteorological Society
ISSN:1558-8424
Status:Published
Keywords:Halo, stratosphere, variations in the along-track,
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:air traffic management and operations
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Flight Experiments > Oberpfaffenhofen
Deposited By: Ziegele, Brigitte
Deposited On:22 Aug 2018 17:58
Last Modified:06 Sep 2019 15:19

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