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Aircraft measurements and numerical simulations of mountain waves over the central Alps: A pre-MAP test case

Doyle, J.D. and Volkert, H. and Dörnbrack, A. and Hoinka, K.P. and Hogan, T.F. (2002) Aircraft measurements and numerical simulations of mountain waves over the central Alps: A pre-MAP test case. Quarterly Journal of the Royal Meteorological Society, 128, pp. 2175-2184. DOI: 10.1256/003590002320603601.

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Official URL: http://www3.interscience.wiley.com/journal/113515522/issue

Abstract

In preparation for the field phase of the Mesoscale Alpine Project (MAP), in situ research-aircraft observations from the DLR Falcon, and three-dimensional high-resolution numerical simulations are used to investigate mountain waves generated during a south föhn event on 10 October 1987. The model simulation qualitatively compares favourably with the aircraft observations in terms of identifying the horizontal and vertical locations of maximum gravity-wave amplitude and rapid decay of wave amplitudes in the lower stratosphere. However, even with reasonably specified large-scale conditions, the vertical velocity and temperature perturbations are not in quantitative agreement with the aircraft measurements. The results highlight some deficiencies that still exist in our predictive capability to simulate gravity-wave generation and propagation explicitly over three-dimensional topography for non-steady conditions. The complexity of the gravity-wave response points toward the necessity of a straightforward aircraft observing strategy that features linear flight segments oriented along the cross-mountain wind direction, a rapid repetition of these segments in order to assess the significance of transients, and a combination of in situ measurements with remote-sensing data (e.g. from lidar systems and dropsondes), an approach that was successfully applied during the MAP.

Document Type:Article
Additional Information:LIDO-Berichtsjahr=2002,
Title:Aircraft measurements and numerical simulations of mountain waves over the central Alps: A pre-MAP test case
Authors:
AuthorsInstitution or Email of Authors
Doyle, J.D.Naval Research Lab., Monerey, CA, USA
Volkert, H.UNSPECIFIED
Dörnbrack, A.UNSPECIFIED
Hoinka, K.P.UNSPECIFIED
Hogan, T.F.Naval Research Lab., Monerey, CA, USA
Date:2002
Journal or Publication Title:Quarterly Journal of the Royal Meteorological Society
Volume:128
DOI:10.1256/003590002320603601
Page Range:pp. 2175-2184
Status:Published
Keywords:Alps, foehn, mountain waves, MAP, gravity waves, numerical modelling
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Ute Löb
Deposited On:15 Jan 2008
Last Modified:12 Dec 2013 20:00

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