Large amplitude waves detected with balloons near the Andes Mountains

DE LA TORRE, A.; ALEXANDER, P.; GIRALDEZ, A.

GEOPHYSICAL RESEARCH LETTERS

AMER GEOPHYSICAL UNION

Año: 1996 vol. 23 p. 1103 - 1106

0094-8276

Spectral results from a vertical sounding of temperaturea nd wind velocity performed withan open stratospheric balloon in Argentina near the Andes mountains between 12 and 25 km of altitude, are reported. The use of sonic anemometers allows for a higher resolution than in previous experiments. The data records are studied in successive subintervals, yieldinag goodspectral correlation between the ascent and the descent around and below the tropopause. Thepossibilities of an orographic origin of large amplitude modes observed in the spectra and of wave generation by nonlinear interactions between them are discussed.