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Mountain waves over Mont Blanc: Influence of a stagnant boundary layer

Smith, R.B. and Skubis, S. and Doyle, J.D. and Broad A.S., and Kiemle, C. and Volkert, H. (2002) Mountain waves over Mont Blanc: Influence of a stagnant boundary layer. Journal of the Atmospheric Sciences, 59, pp. 2073-2092. DOI: 10.1175/1520-0469(2002)059<2073:MWOMBI>2.0.CO;2.

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Official URL: http://ams.allenpress.com/perlserv/?request=get-toc&issn=1520-0469&volume=59&issue=13

Abstract

A stationary mountain wave, embedded in southwesterly flow over Mont Blanc in the Alps, was observed simultaneously by three research aircraft and three types of remote sensing: GPS dropsondes, airborne light detecting and ranging (lidar), and rapid-scan satellite imagery. These observations provide a basis for testing linear and nonlinear theories of how mountain waves over complex terrain are controlled by the ambient wind profile, especially the effects of a low-level stagnant layer and the jet stream aloft. The layer of blocked flow near the ground reduced the amplitude of the wave generation. The strong wind and weak stability in the upper troposphere forced the wave into a decaying “evanescent” state. In spite of this evanescent condition, no lee waves were observed. The authors resolve this paradox by demonstrating that the stagnant layer below 3 km played an additional role. It was able to absorb downward reflected waves, preventing the formation of a resonant cavity. Linear theory, including this low-level absorption, predicts the observed wave structure quite well and captures the wave absorption process found in the fully nonlinear Coupled Ocean–Atmosphere Mesoscale Prediction System (COAMPS) model. In spite of wave decay through the upper troposphere, there is evidence from satellite images and model simulation that the waves reached the uppermost troposphere.

Document Type:Article
Additional Information:LIDO-Berichtsjahr=2002,
Title:Mountain waves over Mont Blanc: Influence of a stagnant boundary layer
Authors:
AuthorsInstitution or Email of Authors
Smith, R.B.Yale Univ., New Haven, CT, USA
Skubis, S.Yale Univ., New Haven, CT, USA
Doyle, J.D.Naval Research Lab., Monerey, CA, USA
Broad A.S., Met. Office, Bracknell, UK
Kiemle, C.UNSPECIFIED
Volkert, H.UNSPECIFIED
Date:2002
Journal or Publication Title:Journal of the Atmospheric Sciences
Volume:59
DOI:10.1175/1520-0469(2002)059<2073:MWOMBI>2.0.CO;2
Page Range:pp. 2073-2092
Status:Published
Keywords:Schwerewellen, Lidarmessungen, Simulation
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: elib DLR-Beauftragter
Deposited On:15 Jan 2008
Last Modified:12 Dec 2013 20:00

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