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Atmospheric gravity waves and turbulence study with acoustic Doppler sounders

 

作者: A. Weill,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1990)
卷期: Volume 87, issue S1  

页码: 5-5

 

ISSN:0001-4966

 

年代: 1990

 

DOI:10.1121/1.2028291

 

出版商: Acoustical Society of America

 

数据来源: AIP

 

摘要:

Work undertaken at CRPE about gravity waves and turbulence indentification and characterization using acoustic remote sensing is presented. In a first part the techniques of measurement and methods of determination of wayes and turbulence parameters and their representativeness are described. Hence the elements are prepared to discuss, in a second part, observations showing interactions between inertial‐gravity waves and turbulence. In particular, the advantage of acoustic remote sensing to localize critical levels related to gravity waves is demonstrated. The mechanism of wave formation related to wind and reflectivity profiles is also interpreted. Vertically propagating gravity waves and their relationship with entrainment at the level of the inversion layer are also analyzed. As elements of a gravity wave field locally observed are generally studied, rather than the field itself, in the third part, observations of a gravity wave field using a Doppler Sodar network are considered. A discussion is then open about relations between the field characteristics and the local properties of the flow. Adjustment of the wavenumber of the gravity waves field to the “most unstable” wavenumber is discussed, which is important in estimating fluxes and momentum associated with the waves. In the conclusion, the generality of the different observations is considered with special emphasis on the problem of interaction between atmosphere and ocean.

 

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