INVESTIGADORES
PULIDO Manuel Arturo
artículos
Título:
Spectral tail of a gravity wave train propagating in a shearing background
Autor/es:
PULIDO M. AND G. CARANTI
Revista:
JOURNAL OF THE ATMOSPHERIC SCIENCES
Editorial:
AMER METEOROLOGICAL SOC
Referencias:
Lugar: Massachussets, USA; Año: 2000 vol. 57 p. 1473 - 1478
ISSN:
0022-4928
Resumen:
The causes of the appearance of a tail in the power spectrum of a gravity wave train in a shearing backgroundterminating under the Hodges condition are studied. The power spectrum of this train for a wavenumber greaterthan the cutoff value has amplitudes and slopes similar to the observed in actual wind profiles. It is shown thatthe Fourier transform for large wavenumbers can be expressed as an inverse power series of the wavenumber,where the first two terms are dominant (k21 and k22) with a power spectrum slope from 22 to 24 in the tail.The main features that produce the tail are the discontinuities in the profile.An observed profile is analyzed showing that the power spectral amplitudes do not necessarily come fromthe waves contained in the profile; they can arise from irregularities, nonperiodic jumps that could be interpretedas discontinuities.
