The global distribution of gravity wave energy in the lower stratosphere derived from GPS data and gravity wave modelling: Attempt and challenges

Five years of global temperatures retrieved from radio occultations measured by Champ (Challenging Minisatellite Payload) and SAC-C (Satelite de Aplicaciones Cientificas-C) are analyzed for gravity waves (GWs). In order to separate GWs from other atmospheric variations, a high-pass filter was applie...

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Detalles Bibliográficos
Autor principal: De La Torre, Alejandro Eduardo
Publicado: 2007
Materias:
GPS
Gravity waves
Momentum flux
Parameterization scheme
Atmospheric temperature
Computer simulation
Global positioning system
Parameterization
Upper atmosphere
Gravity wave energy
Momentum flux distributions
Meteorology
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13646826_v69_n17-18_p2238_Frohlich
http://hdl.handle.net/20.500.12110/paper_13646826_v69_n17-18_p2238_Frohlich
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_13646826_v69_n17-18_p2238_Frohlich
record_format dspace
spelling paper:paper_13646826_v69_n17-18_p2238_Frohlich2023-06-08T16:11:55Z The global distribution of gravity wave energy in the lower stratosphere derived from GPS data and gravity wave modelling: Attempt and challenges De La Torre, Alejandro Eduardo GPS Gravity waves Momentum flux Parameterization scheme Atmospheric temperature Computer simulation Global positioning system Gravity waves Parameterization Upper atmosphere Gravity wave energy Momentum flux Momentum flux distributions Meteorology Five years of global temperatures retrieved from radio occultations measured by Champ (Challenging Minisatellite Payload) and SAC-C (Satelite de Aplicaciones Cientificas-C) are analyzed for gravity waves (GWs). In order to separate GWs from other atmospheric variations, a high-pass filter was applied on the vertical profile. Resulting temperature fluctuations correspond to vertical wavelengths between 400 m (instrumental resolution) and 10 km (limit of the high-pass filter). The temperature fluctuations can be converted into GW potential energy, but for comparison with parameterization schemes GW momentum flux is required. We therefore used representative values for the vertical and horizontal wavelength to infer GW momentum flux from the GPS measurements. The vertical wavelength value is determined by high-pass filtering, the horizontal wavelength is adopted from a latitude-dependent climatology. The obtained momentum flux distributions agree well, both in global distribution and in absolute values, with simulations using the Warner and McIntyre parameterization (WM) scheme. However, discrepancies are found in the annual cycle. Online simulations, implementing the WM scheme in the mechanistic COMMA-LIM (Cologne Model of the Middle Atmosphere-Leipzig Institute for Meteorology) general circulation model (GCM), do not converge, demonstrating that a good representation of GWs in a GCM requires both a realistic launch distribution and an adequate representation of GW breaking and momentum transfer. © 2007 Elsevier Ltd. All rights reserved. Fil:de la Torre, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13646826_v69_n17-18_p2238_Frohlich http://hdl.handle.net/20.500.12110/paper_13646826_v69_n17-18_p2238_Frohlich
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic GPS
Gravity waves
Momentum flux
Parameterization scheme
Atmospheric temperature
Computer simulation
Global positioning system
Gravity waves
Parameterization
Upper atmosphere
Gravity wave energy
Momentum flux
Momentum flux distributions
Meteorology
spellingShingle GPS
Gravity waves
Momentum flux
Parameterization scheme
Atmospheric temperature
Computer simulation
Global positioning system
Gravity waves
Parameterization
Upper atmosphere
Gravity wave energy
Momentum flux
Momentum flux distributions
Meteorology
De La Torre, Alejandro Eduardo
The global distribution of gravity wave energy in the lower stratosphere derived from GPS data and gravity wave modelling: Attempt and challenges
topic_facet GPS
Gravity waves
Momentum flux
Parameterization scheme
Atmospheric temperature
Computer simulation
Global positioning system
Gravity waves
Parameterization
Upper atmosphere
Gravity wave energy
Momentum flux
Momentum flux distributions
Meteorology
description Five years of global temperatures retrieved from radio occultations measured by Champ (Challenging Minisatellite Payload) and SAC-C (Satelite de Aplicaciones Cientificas-C) are analyzed for gravity waves (GWs). In order to separate GWs from other atmospheric variations, a high-pass filter was applied on the vertical profile. Resulting temperature fluctuations correspond to vertical wavelengths between 400 m (instrumental resolution) and 10 km (limit of the high-pass filter). The temperature fluctuations can be converted into GW potential energy, but for comparison with parameterization schemes GW momentum flux is required. We therefore used representative values for the vertical and horizontal wavelength to infer GW momentum flux from the GPS measurements. The vertical wavelength value is determined by high-pass filtering, the horizontal wavelength is adopted from a latitude-dependent climatology. The obtained momentum flux distributions agree well, both in global distribution and in absolute values, with simulations using the Warner and McIntyre parameterization (WM) scheme. However, discrepancies are found in the annual cycle. Online simulations, implementing the WM scheme in the mechanistic COMMA-LIM (Cologne Model of the Middle Atmosphere-Leipzig Institute for Meteorology) general circulation model (GCM), do not converge, demonstrating that a good representation of GWs in a GCM requires both a realistic launch distribution and an adequate representation of GW breaking and momentum transfer. © 2007 Elsevier Ltd. All rights reserved.
author De La Torre, Alejandro Eduardo
author_facet De La Torre, Alejandro Eduardo
author_sort De La Torre, Alejandro Eduardo
title The global distribution of gravity wave energy in the lower stratosphere derived from GPS data and gravity wave modelling: Attempt and challenges
title_short The global distribution of gravity wave energy in the lower stratosphere derived from GPS data and gravity wave modelling: Attempt and challenges
title_full The global distribution of gravity wave energy in the lower stratosphere derived from GPS data and gravity wave modelling: Attempt and challenges
title_fullStr The global distribution of gravity wave energy in the lower stratosphere derived from GPS data and gravity wave modelling: Attempt and challenges
title_full_unstemmed The global distribution of gravity wave energy in the lower stratosphere derived from GPS data and gravity wave modelling: Attempt and challenges
title_sort global distribution of gravity wave energy in the lower stratosphere derived from gps data and gravity wave modelling: attempt and challenges
publishDate 2007
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13646826_v69_n17-18_p2238_Frohlich
http://hdl.handle.net/20.500.12110/paper_13646826_v69_n17-18_p2238_Frohlich
work_keys_str_mv AT delatorrealejandroeduardo theglobaldistributionofgravitywaveenergyinthelowerstratospherederivedfromgpsdataandgravitywavemodellingattemptandchallenges
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