Stratospheric and tropospheric wave measurements near the Andes mountains

Experimental results and interpretation of temperature, pressure and wind velocity measurements, performed with an instrumented balloon, are presented. The balloon, an open-type stratospheric one was launched from Mendoza (Argentina), near the Andes mountains. The data analysis suggests the presence...

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Autores principales: De La Torre, A., Téitelbaum, H., Vial, F.
Formato: JOUR
Materias:
Andes
Atmosphere
Measurements
Mountains
Waves
balloon design
balloon observation
internal gravity wave
mountain wave
orographic wave
radiosonde balloon
Argentina, Andes, Mendoza
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00219169_v58_n5_p521_DeLaTorre
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00219169_v58_n5_p521_DeLaTorre2023-10-03T14:22:42Z Stratospheric and tropospheric wave measurements near the Andes mountains De La Torre, A. Téitelbaum, H. Vial, F. Andes Atmosphere Measurements Mountains Waves balloon design balloon observation internal gravity wave mountain wave orographic wave radiosonde balloon Argentina, Andes, Mendoza Experimental results and interpretation of temperature, pressure and wind velocity measurements, performed with an instrumented balloon, are presented. The balloon, an open-type stratospheric one was launched from Mendoza (Argentina), near the Andes mountains. The data analysis suggests the presence of a large amplitude quasi-inertial gravity wave, with intrinsic period close to 0.5 days, and vertical wavelength of around 1.7 km just below the tropopause. The possible orographic origin of this wave is discussed. A Fourier analysis confirms the existence of this mode, simultaneously in the temperature and in the wind velocity components. A hodograph of the zonal and meridional wind components shows the expected counterclockwise sense of rotation of the horizontal velocity with increasing altitude, corresponding to a long period gravity wave, in the southern hemisphere. It is found that the vertical wind velocity variations measured by the anemometer, are mainly due to buoyancy force variations induced by the wave on the open stratospheric balloon. The vertical profile obtained by the anemometer is anticorrelated with the rate of ascent or descent of the gondola. As a consequence, the wave induced velocity is very difficult to obtain using these balloons, contrary to the case of radiosonde balloon data. The differences in the response of open stratospheric and radiosonde-type balloons to the presence of internal gravity waves may be explained by their different design and material characteristics. Copyright © 1996 Elsevier Science Ltd All rights reserved. Fil:De La Torre, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00219169_v58_n5_p521_DeLaTorre
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Andes
Atmosphere
Measurements
Mountains
Waves
balloon design
balloon observation
internal gravity wave
mountain wave
orographic wave
radiosonde balloon
Argentina, Andes, Mendoza
spellingShingle Andes
Atmosphere
Measurements
Mountains
Waves
balloon design
balloon observation
internal gravity wave
mountain wave
orographic wave
radiosonde balloon
Argentina, Andes, Mendoza
De La Torre, A.
Téitelbaum, H.
Vial, F.
Stratospheric and tropospheric wave measurements near the Andes mountains
topic_facet Andes
Atmosphere
Measurements
Mountains
Waves
balloon design
balloon observation
internal gravity wave
mountain wave
orographic wave
radiosonde balloon
Argentina, Andes, Mendoza
description Experimental results and interpretation of temperature, pressure and wind velocity measurements, performed with an instrumented balloon, are presented. The balloon, an open-type stratospheric one was launched from Mendoza (Argentina), near the Andes mountains. The data analysis suggests the presence of a large amplitude quasi-inertial gravity wave, with intrinsic period close to 0.5 days, and vertical wavelength of around 1.7 km just below the tropopause. The possible orographic origin of this wave is discussed. A Fourier analysis confirms the existence of this mode, simultaneously in the temperature and in the wind velocity components. A hodograph of the zonal and meridional wind components shows the expected counterclockwise sense of rotation of the horizontal velocity with increasing altitude, corresponding to a long period gravity wave, in the southern hemisphere. It is found that the vertical wind velocity variations measured by the anemometer, are mainly due to buoyancy force variations induced by the wave on the open stratospheric balloon. The vertical profile obtained by the anemometer is anticorrelated with the rate of ascent or descent of the gondola. As a consequence, the wave induced velocity is very difficult to obtain using these balloons, contrary to the case of radiosonde balloon data. The differences in the response of open stratospheric and radiosonde-type balloons to the presence of internal gravity waves may be explained by their different design and material characteristics. Copyright © 1996 Elsevier Science Ltd All rights reserved.
format JOUR
author De La Torre, A.
Téitelbaum, H.
Vial, F.
author_facet De La Torre, A.
Téitelbaum, H.
Vial, F.
author_sort De La Torre, A.
title Stratospheric and tropospheric wave measurements near the Andes mountains
title_short Stratospheric and tropospheric wave measurements near the Andes mountains
title_full Stratospheric and tropospheric wave measurements near the Andes mountains
title_fullStr Stratospheric and tropospheric wave measurements near the Andes mountains
title_full_unstemmed Stratospheric and tropospheric wave measurements near the Andes mountains
title_sort stratospheric and tropospheric wave measurements near the andes mountains
url http://hdl.handle.net/20.500.12110/paper_00219169_v58_n5_p521_DeLaTorre
work_keys_str_mv AT delatorrea stratosphericandtroposphericwavemeasurementsneartheandesmountains
AT teitelbaumh stratosphericandtroposphericwavemeasurementsneartheandesmountains
AT vialf stratosphericandtroposphericwavemeasurementsneartheandesmountains
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