Premium
Distortion of gravity wave spectra measured from ground‐based stations
Author(s) -
Lefrère J.,
Sidi C.
Publication year - 1990
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl017i010p01581
Subject(s) - wavenumber , attenuation , distortion (music) , spectral line , doppler effect , physics , geodesy , gravity wave , computational physics , internal wave , geology , wave propagation , optics , amplifier , optoelectronics , cmos , astronomy
The attenuation induced by time averaging of ground based measurements of internal gravity waves is made scale dependent by the Doppler shifts resulting from mean atmospheric motions, leading to some distortion of the experimental spectra versus vertical wavenumber. This spectral distortion mainly affects the large wavenumber range where the spectral level may be strongly underestimated, even for a few minutes averaging time in the case of vertical velocity measurements. Numerical evaluations of the spectral attenuation are presented, assuming a standard model of the random internal wave field.