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

Smith, Ronald B. und Skubis, S. und Doyle, James D. und Broad, Adrian S. und Kiemle, Christoph und Volkert, Hans (2002) Mountain waves over Mont Blanc: Influence of a stagnant boundary layer. Journal of the Atmospheric Sciences, 59, Seiten 2073-2092. DOI: 10.1175/1520-0469(2002)059<2073:MWOMBI>2.0.CO;2. ISSN 0022-4928.

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

Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen:LIDO-Berichtsjahr=2002,
Titel:Mountain waves over Mont Blanc: Influence of a stagnant boundary layer
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Smith, Ronald B.Yale Univ., New Haven, CT, USA
Skubis, S.Yale Univ., New Haven, CT, USA
Doyle, James D.Naval Research Lab., Monerey, CA, USA
Broad, Adrian S.Met. Office, Bracknell, UK
Kiemle, ChristophDLR, IPA
Volkert, HansDLR, IPA
Datum:2002
Erschienen in:Journal of the Atmospheric Sciences
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:59
DOI :10.1175/1520-0469(2002)059<2073:MWOMBI>2.0.CO;2
Seitenbereich:Seiten 2073-2092
ISSN:0022-4928
Status:veröffentlicht
Stichwörter:Schwerewellen, Lidarmessungen, Simulation
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Atmosphären- und Klimaforschung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Wolkenphysik und Verkehrsmeteorologie
Hinterlegt von: elib DLR-Beauftragter
Hinterlegt am:15 Jan 2008
Letzte Änderung:11 Nov 2014 17:37

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