Large-amplitude gravity waves above the southern Andes, the Drake Passage, and the Antarctic Peninsula

Autores
De La Torre, A.; Alexander, P.; Hierro, R.; Llamedo, P.; Rolla, A.; Schmidt, T.; Wickert, J.
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Above the southern Andes range and its prolongation in the Antarctic Peninsula, large-amplitude mountain and shear gravity waves observed with Weather Research and Forecasting (WRF) mesoscale model simulations during winter 2009 are analyzed. Two specific reasons motivated this study: (1) a decade of satellite observations of temperature fluctuations in the stratosphere, allowing us to infer that this region may be launching the largest-amplitude gravity waves into the upper atmosphere, and (2) the recent design of a research program to investigate these features in detail, the Southern Andes Antarctic Gravity wave Initiative (SAANGRIA). The simulations are forced with ERA-Interim data from the European Centre for Medium-Range Weather Forecasts. The approach selected for the regional downscaling is based on consecutive integrations with weekly reinitialization with 24 h of spin-up, and the outputs during this period are excluded from the analysis. From 1 June to 31 August 2009, five case studies were selected on the basis of their outstanding characteristics and large wave amplitudes. In general, one or two prevailing modes of oscillation are identified after applying continuous wavelet transforms at constant pressure levels and perpendicularly to the nominal orientation of the dominant wave crests. In all cases, the dominant modes are characterized by horizontal wavelengths around 50 km. Their vertical wavelengths, depending on a usually strong background wind shear, are estimated to be between 2 and 11 km. The corresponding intrinsic periods range between 10 and 140 min. In general, the estimated vertical wavelength (intrinsic period) maximizes (minimizes) around 250-300 hPa. The synoptic circulation for each case is described. Zonal and meridional components of the vertical flux of horizontal momentum are shown in detail for each case, including possible horizontal wavelengths between 12 and 400 km. Large values of this flux are observed at higher pressure levels, decreasing with increasing height after a progressive deposition of momentum by different mechanisms. As expected, in the wintertime upper troposphere and lower stratosphere in this region, a prevailing zonal component is negative almost everywhere, with the exception of one case above the northern tip of the Antarctic Peninsula. A comparison with previous experimental results reported in the region from in situ and remote sensing measurements suggests a good agreement with the momentum flux profiles computed from the simulations. Partial wave reflection near the tropopause was found, as considerable departures from equipartition between potential and kinetic wave energy are obtained in all cases and at all pressure levels. This ratio was always less than 1 below the lower stratosphere. Copyright 2012 by the American Geophysical Union.
Fil:De La Torre, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Alexander, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Hierro, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Llamedo, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Rolla, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fuente
J. Geophys. Res. D Atmos. 2012;117(2)
Materia
Atmospherics
Computer simulation
Gravity waves
Remote sensing
Research
Upper atmosphere
Wave energy conversion
Wavelet transforms
Weather forecasting
Antarctic Peninsula
Background winds
Constant pressures
Continuous Wavelet Transform
Different mechanisms
Dominant mode
Down-scaling
Drake passage
Equipartition
European Centre for Medium-Range Weather Forecasts
In-situ
Kinetic waves
Lower stratosphere
Mesoscale model simulation
Momentum flux
Partial waves
Pressure level
Reinitialization
Research programs
Satellite observations
Spin-up
Temperature fluctuation
Upper troposphere
Vertical fluxes
Wave amplitudes
Wave crest
Weather research and forecasting
Shear flow
air-sea interaction
amplitude
gravity wave
in situ measurement
mesocosm
mesoscale motion
mountain region
remote sensing
wave energy
wavelength
wind shear
zonal wind
Andes
Antarctic Peninsula
Antarctica
Drake Passage
West Antarctica
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/2.5/ar
Repositorio
Biblioteca Digital (UBA-FCEN)
Institución
Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
OAI Identificador
paperaa:paper_01480227_v117_n2_p_DeLaTorre

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oai_identifier_str paperaa:paper_01480227_v117_n2_p_DeLaTorre
network_acronym_str BDUBAFCEN
repository_id_str 1896
network_name_str Biblioteca Digital (UBA-FCEN)
spelling Large-amplitude gravity waves above the southern Andes, the Drake Passage, and the Antarctic PeninsulaDe La Torre, A.Alexander, P.Hierro, R.Llamedo, P.Rolla, A.Schmidt, T.Wickert, J.AtmosphericsComputer simulationGravity wavesRemote sensingResearchUpper atmosphereWave energy conversionWavelet transformsWeather forecastingAntarctic PeninsulaBackground windsConstant pressuresContinuous Wavelet TransformDifferent mechanismsDominant modeDown-scalingDrake passageEquipartitionEuropean Centre for Medium-Range Weather ForecastsIn-situKinetic wavesLower stratosphereMesoscale model simulationMomentum fluxPartial wavesPressure levelReinitializationResearch programsSatellite observationsSpin-upTemperature fluctuationUpper troposphereVertical fluxesWave amplitudesWave crestWeather research and forecastingShear flowair-sea interactionamplitudegravity wavein situ measurementmesocosmmesoscale motionmountain regionremote sensingwave energywavelengthwind shearzonal windAndesAntarctic PeninsulaAntarcticaDrake PassageWest AntarcticaAbove the southern Andes range and its prolongation in the Antarctic Peninsula, large-amplitude mountain and shear gravity waves observed with Weather Research and Forecasting (WRF) mesoscale model simulations during winter 2009 are analyzed. Two specific reasons motivated this study: (1) a decade of satellite observations of temperature fluctuations in the stratosphere, allowing us to infer that this region may be launching the largest-amplitude gravity waves into the upper atmosphere, and (2) the recent design of a research program to investigate these features in detail, the Southern Andes Antarctic Gravity wave Initiative (SAANGRIA). The simulations are forced with ERA-Interim data from the European Centre for Medium-Range Weather Forecasts. The approach selected for the regional downscaling is based on consecutive integrations with weekly reinitialization with 24 h of spin-up, and the outputs during this period are excluded from the analysis. From 1 June to 31 August 2009, five case studies were selected on the basis of their outstanding characteristics and large wave amplitudes. In general, one or two prevailing modes of oscillation are identified after applying continuous wavelet transforms at constant pressure levels and perpendicularly to the nominal orientation of the dominant wave crests. In all cases, the dominant modes are characterized by horizontal wavelengths around 50 km. Their vertical wavelengths, depending on a usually strong background wind shear, are estimated to be between 2 and 11 km. The corresponding intrinsic periods range between 10 and 140 min. In general, the estimated vertical wavelength (intrinsic period) maximizes (minimizes) around 250-300 hPa. The synoptic circulation for each case is described. Zonal and meridional components of the vertical flux of horizontal momentum are shown in detail for each case, including possible horizontal wavelengths between 12 and 400 km. Large values of this flux are observed at higher pressure levels, decreasing with increasing height after a progressive deposition of momentum by different mechanisms. As expected, in the wintertime upper troposphere and lower stratosphere in this region, a prevailing zonal component is negative almost everywhere, with the exception of one case above the northern tip of the Antarctic Peninsula. A comparison with previous experimental results reported in the region from in situ and remote sensing measurements suggests a good agreement with the momentum flux profiles computed from the simulations. Partial wave reflection near the tropopause was found, as considerable departures from equipartition between potential and kinetic wave energy are obtained in all cases and at all pressure levels. This ratio was always less than 1 below the lower stratosphere. Copyright 2012 by the American Geophysical Union.Fil:De La Torre, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Alexander, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Hierro, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Llamedo, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Rolla, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.2012info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://hdl.handle.net/20.500.12110/paper_01480227_v117_n2_p_DeLaTorreJ. Geophys. Res. D Atmos. 2012;117(2)reponame:Biblioteca Digital (UBA-FCEN)instname:Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturalesinstacron:UBA-FCENenginfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/2.5/ar2025-09-29T13:42:49Zpaperaa:paper_01480227_v117_n2_p_DeLaTorreInstitucionalhttps://digital.bl.fcen.uba.ar/Universidad públicaNo correspondehttps://digital.bl.fcen.uba.ar/cgi-bin/oaiserver.cgiana@bl.fcen.uba.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:18962025-09-29 13:42:50.607Biblioteca Digital (UBA-FCEN) - Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturalesfalse
dc.title.none.fl_str_mv Large-amplitude gravity waves above the southern Andes, the Drake Passage, and the Antarctic Peninsula
title Large-amplitude gravity waves above the southern Andes, the Drake Passage, and the Antarctic Peninsula
spellingShingle Large-amplitude gravity waves above the southern Andes, the Drake Passage, and the Antarctic Peninsula
De La Torre, A.
Atmospherics
Computer simulation
Gravity waves
Remote sensing
Research
Upper atmosphere
Wave energy conversion
Wavelet transforms
Weather forecasting
Antarctic Peninsula
Background winds
Constant pressures
Continuous Wavelet Transform
Different mechanisms
Dominant mode
Down-scaling
Drake passage
Equipartition
European Centre for Medium-Range Weather Forecasts
In-situ
Kinetic waves
Lower stratosphere
Mesoscale model simulation
Momentum flux
Partial waves
Pressure level
Reinitialization
Research programs
Satellite observations
Spin-up
Temperature fluctuation
Upper troposphere
Vertical fluxes
Wave amplitudes
Wave crest
Weather research and forecasting
Shear flow
air-sea interaction
amplitude
gravity wave
in situ measurement
mesocosm
mesoscale motion
mountain region
remote sensing
wave energy
wavelength
wind shear
zonal wind
Andes
Antarctic Peninsula
Antarctica
Drake Passage
West Antarctica
title_short Large-amplitude gravity waves above the southern Andes, the Drake Passage, and the Antarctic Peninsula
title_full Large-amplitude gravity waves above the southern Andes, the Drake Passage, and the Antarctic Peninsula
title_fullStr Large-amplitude gravity waves above the southern Andes, the Drake Passage, and the Antarctic Peninsula
title_full_unstemmed Large-amplitude gravity waves above the southern Andes, the Drake Passage, and the Antarctic Peninsula
title_sort Large-amplitude gravity waves above the southern Andes, the Drake Passage, and the Antarctic Peninsula
dc.creator.none.fl_str_mv De La Torre, A.
Alexander, P.
Hierro, R.
Llamedo, P.
Rolla, A.
Schmidt, T.
Wickert, J.
author De La Torre, A.
author_facet De La Torre, A.
Alexander, P.
Hierro, R.
Llamedo, P.
Rolla, A.
Schmidt, T.
Wickert, J.
author_role author
author2 Alexander, P.
Hierro, R.
Llamedo, P.
Rolla, A.
Schmidt, T.
Wickert, J.
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Atmospherics
Computer simulation
Gravity waves
Remote sensing
Research
Upper atmosphere
Wave energy conversion
Wavelet transforms
Weather forecasting
Antarctic Peninsula
Background winds
Constant pressures
Continuous Wavelet Transform
Different mechanisms
Dominant mode
Down-scaling
Drake passage
Equipartition
European Centre for Medium-Range Weather Forecasts
In-situ
Kinetic waves
Lower stratosphere
Mesoscale model simulation
Momentum flux
Partial waves
Pressure level
Reinitialization
Research programs
Satellite observations
Spin-up
Temperature fluctuation
Upper troposphere
Vertical fluxes
Wave amplitudes
Wave crest
Weather research and forecasting
Shear flow
air-sea interaction
amplitude
gravity wave
in situ measurement
mesocosm
mesoscale motion
mountain region
remote sensing
wave energy
wavelength
wind shear
zonal wind
Andes
Antarctic Peninsula
Antarctica
Drake Passage
West Antarctica
topic Atmospherics
Computer simulation
Gravity waves
Remote sensing
Research
Upper atmosphere
Wave energy conversion
Wavelet transforms
Weather forecasting
Antarctic Peninsula
Background winds
Constant pressures
Continuous Wavelet Transform
Different mechanisms
Dominant mode
Down-scaling
Drake passage
Equipartition
European Centre for Medium-Range Weather Forecasts
In-situ
Kinetic waves
Lower stratosphere
Mesoscale model simulation
Momentum flux
Partial waves
Pressure level
Reinitialization
Research programs
Satellite observations
Spin-up
Temperature fluctuation
Upper troposphere
Vertical fluxes
Wave amplitudes
Wave crest
Weather research and forecasting
Shear flow
air-sea interaction
amplitude
gravity wave
in situ measurement
mesocosm
mesoscale motion
mountain region
remote sensing
wave energy
wavelength
wind shear
zonal wind
Andes
Antarctic Peninsula
Antarctica
Drake Passage
West Antarctica
dc.description.none.fl_txt_mv Above the southern Andes range and its prolongation in the Antarctic Peninsula, large-amplitude mountain and shear gravity waves observed with Weather Research and Forecasting (WRF) mesoscale model simulations during winter 2009 are analyzed. Two specific reasons motivated this study: (1) a decade of satellite observations of temperature fluctuations in the stratosphere, allowing us to infer that this region may be launching the largest-amplitude gravity waves into the upper atmosphere, and (2) the recent design of a research program to investigate these features in detail, the Southern Andes Antarctic Gravity wave Initiative (SAANGRIA). The simulations are forced with ERA-Interim data from the European Centre for Medium-Range Weather Forecasts. The approach selected for the regional downscaling is based on consecutive integrations with weekly reinitialization with 24 h of spin-up, and the outputs during this period are excluded from the analysis. From 1 June to 31 August 2009, five case studies were selected on the basis of their outstanding characteristics and large wave amplitudes. In general, one or two prevailing modes of oscillation are identified after applying continuous wavelet transforms at constant pressure levels and perpendicularly to the nominal orientation of the dominant wave crests. In all cases, the dominant modes are characterized by horizontal wavelengths around 50 km. Their vertical wavelengths, depending on a usually strong background wind shear, are estimated to be between 2 and 11 km. The corresponding intrinsic periods range between 10 and 140 min. In general, the estimated vertical wavelength (intrinsic period) maximizes (minimizes) around 250-300 hPa. The synoptic circulation for each case is described. Zonal and meridional components of the vertical flux of horizontal momentum are shown in detail for each case, including possible horizontal wavelengths between 12 and 400 km. Large values of this flux are observed at higher pressure levels, decreasing with increasing height after a progressive deposition of momentum by different mechanisms. As expected, in the wintertime upper troposphere and lower stratosphere in this region, a prevailing zonal component is negative almost everywhere, with the exception of one case above the northern tip of the Antarctic Peninsula. A comparison with previous experimental results reported in the region from in situ and remote sensing measurements suggests a good agreement with the momentum flux profiles computed from the simulations. Partial wave reflection near the tropopause was found, as considerable departures from equipartition between potential and kinetic wave energy are obtained in all cases and at all pressure levels. This ratio was always less than 1 below the lower stratosphere. Copyright 2012 by the American Geophysical Union.
Fil:De La Torre, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Alexander, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Hierro, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Llamedo, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Rolla, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
description Above the southern Andes range and its prolongation in the Antarctic Peninsula, large-amplitude mountain and shear gravity waves observed with Weather Research and Forecasting (WRF) mesoscale model simulations during winter 2009 are analyzed. Two specific reasons motivated this study: (1) a decade of satellite observations of temperature fluctuations in the stratosphere, allowing us to infer that this region may be launching the largest-amplitude gravity waves into the upper atmosphere, and (2) the recent design of a research program to investigate these features in detail, the Southern Andes Antarctic Gravity wave Initiative (SAANGRIA). The simulations are forced with ERA-Interim data from the European Centre for Medium-Range Weather Forecasts. The approach selected for the regional downscaling is based on consecutive integrations with weekly reinitialization with 24 h of spin-up, and the outputs during this period are excluded from the analysis. From 1 June to 31 August 2009, five case studies were selected on the basis of their outstanding characteristics and large wave amplitudes. In general, one or two prevailing modes of oscillation are identified after applying continuous wavelet transforms at constant pressure levels and perpendicularly to the nominal orientation of the dominant wave crests. In all cases, the dominant modes are characterized by horizontal wavelengths around 50 km. Their vertical wavelengths, depending on a usually strong background wind shear, are estimated to be between 2 and 11 km. The corresponding intrinsic periods range between 10 and 140 min. In general, the estimated vertical wavelength (intrinsic period) maximizes (minimizes) around 250-300 hPa. The synoptic circulation for each case is described. Zonal and meridional components of the vertical flux of horizontal momentum are shown in detail for each case, including possible horizontal wavelengths between 12 and 400 km. Large values of this flux are observed at higher pressure levels, decreasing with increasing height after a progressive deposition of momentum by different mechanisms. As expected, in the wintertime upper troposphere and lower stratosphere in this region, a prevailing zonal component is negative almost everywhere, with the exception of one case above the northern tip of the Antarctic Peninsula. A comparison with previous experimental results reported in the region from in situ and remote sensing measurements suggests a good agreement with the momentum flux profiles computed from the simulations. Partial wave reflection near the tropopause was found, as considerable departures from equipartition between potential and kinetic wave energy are obtained in all cases and at all pressure levels. This ratio was always less than 1 below the lower stratosphere. Copyright 2012 by the American Geophysical Union.
publishDate 2012
dc.date.none.fl_str_mv 2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/20.500.12110/paper_01480227_v117_n2_p_DeLaTorre
url http://hdl.handle.net/20.500.12110/paper_01480227_v117_n2_p_DeLaTorre
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/2.5/ar
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/2.5/ar
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv J. Geophys. Res. D Atmos. 2012;117(2)
reponame:Biblioteca Digital (UBA-FCEN)
instname:Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
instacron:UBA-FCEN
reponame_str Biblioteca Digital (UBA-FCEN)
collection Biblioteca Digital (UBA-FCEN)
instname_str Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
instacron_str UBA-FCEN
institution UBA-FCEN
repository.name.fl_str_mv Biblioteca Digital (UBA-FCEN) - Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
repository.mail.fl_str_mv ana@bl.fcen.uba.ar
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