A study of stratospheric GW fluctuations and sporadic E at midlatitudes with focus on possible orographic effect of Andes

Mostrar todas las versiones(6)

Longitudinal dependences of stratospheric gravity wave (GW) fluctuations and lower ionospheric irregularities (sporadic E) at midlatitudes are studied by means of radio occultation data of the Global Positioning System/Meteorology Experiment (GPS/MET) satellite mission. The zonal average of temperat...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Hocke, K., Tsuda, T., De La Torre, A.
Formato: Artículo publishedVersion
Publicado: 2002
Materias:
Andes
GPS radio occultation
Mountain wave propagation
Orographic waves
Sporadic E
Stratospheric gravity waves
Data reduction
Global positioning system
Gravity waves
Ionosphere
Meteorology
Temperature distribution
Upper atmosphere
GPS
gravity wave
ionosphere
orographic effect
stratosphere
Argentina
Atlantic Ocean
Eurasia
South America
Tierra del Fuego [(PRV) Argentina]
Ushuaia
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01480227_v107_n20_p5_Hocke
http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_01480227_v107_n20_p5_Hocke_oai
Aporte de:
Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires
id I28-R145-paper_01480227_v107_n20_p5_Hocke_oai
record_format dspace
spelling I28-R145-paper_01480227_v107_n20_p5_Hocke_oai2020-10-19 Hocke, K. Tsuda, T. De La Torre, A. 2002 Longitudinal dependences of stratospheric gravity wave (GW) fluctuations and lower ionospheric irregularities (sporadic E) at midlatitudes are studied by means of radio occultation data of the Global Positioning System/Meteorology Experiment (GPS/MET) satellite mission. The zonal average of temperature variance of GW fluctuations with vertical scales less than 7 km at northern midlatitudes is observed to be similar to that at southern midlatitudes, but there is a significant interhemispheric difference in the longitudinal dependence of GW fluctuations. The GPS/MET data at northern midlatitudes show a rapid change of the gravity wave distribution from 25 to 35 km height, resulting in a broad maximum of temperature variance located over the Atlantic and Eurasia. We only find in the wave distribution at h = 25 km some weak traces of possible orographic effects. On the other hand, the distribution of GW fluctuations at southern midlatitudes has a strong and sharp maximum over Andes, which is obviously due to orographic wave generation by the interaction of surface wind with the Andean mountain ridge. This observation of the new GPS radio occultation technique is in agreement with previous measurements of spaceborne microwave and infrared limb sounders. The amplitude of the average wave field increases with height over Andes, while the amplitude maximum moves westward, against the prevailing wind. The temperature fluctuations have an apparent, dominant vertical wavelength of around 6 km. In situ measurements by a balloon-borne rawinsonde at Ushuaia, Argentina (54.7°S, 68.1°W) are compared to a simultaneous GPS/MET temperature profile. The balloon observations of temperature and horizontal wind are interpreted by a large amplitude mountain wave propagating to the upper stratosphere. Wave characteristics and atmospheric background conditions are investigated in detail for this mountain wave observation. Finally, the GPS/MET experiment indicates enhanced sporadic E in the lower ionosphere over Southern Andes. We assume that these plasma irregularities are generated by enhanced, upward wave flux due to the possible orographic ettect of Andes. Copyright 2002 by the American Geophysical Union. Fil:De La Torre, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_01480227_v107_n20_p5_Hocke info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar J. Geophys. Res. D Atmos. 2002;107(20):5-1-5-16 Andes GPS radio occultation Mountain wave propagation Orographic waves Sporadic E Stratospheric gravity waves Data reduction Global positioning system Gravity waves Ionosphere Meteorology Temperature distribution Upper atmosphere GPS gravity wave ionosphere orographic effect stratosphere Andes Argentina Atlantic Ocean Eurasia South America Tierra del Fuego [(PRV) Argentina] Ushuaia A study of stratospheric GW fluctuations and sporadic E at midlatitudes with focus on possible orographic effect of Andes info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_01480227_v107_n20_p5_Hocke_oai
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-145
collection Repositorio Digital de la Universidad de Buenos Aires (UBA)
topic Andes
GPS radio occultation
Mountain wave propagation
Orographic waves
Sporadic E
Stratospheric gravity waves
Data reduction
Global positioning system
Gravity waves
Ionosphere
Meteorology
Temperature distribution
Upper atmosphere
GPS
gravity wave
ionosphere
orographic effect
stratosphere
Andes
Argentina
Atlantic Ocean
Eurasia
South America
Tierra del Fuego [(PRV) Argentina]
Ushuaia
spellingShingle Andes
GPS radio occultation
Mountain wave propagation
Orographic waves
Sporadic E
Stratospheric gravity waves
Data reduction
Global positioning system
Gravity waves
Ionosphere
Meteorology
Temperature distribution
Upper atmosphere
GPS
gravity wave
ionosphere
orographic effect
stratosphere
Andes
Argentina
Atlantic Ocean
Eurasia
South America
Tierra del Fuego [(PRV) Argentina]
Ushuaia
Hocke, K.
Tsuda, T.
De La Torre, A.
A study of stratospheric GW fluctuations and sporadic E at midlatitudes with focus on possible orographic effect of Andes
topic_facet Andes
GPS radio occultation
Mountain wave propagation
Orographic waves
Sporadic E
Stratospheric gravity waves
Data reduction
Global positioning system
Gravity waves
Ionosphere
Meteorology
Temperature distribution
Upper atmosphere
GPS
gravity wave
ionosphere
orographic effect
stratosphere
Andes
Argentina
Atlantic Ocean
Eurasia
South America
Tierra del Fuego [(PRV) Argentina]
Ushuaia
description Longitudinal dependences of stratospheric gravity wave (GW) fluctuations and lower ionospheric irregularities (sporadic E) at midlatitudes are studied by means of radio occultation data of the Global Positioning System/Meteorology Experiment (GPS/MET) satellite mission. The zonal average of temperature variance of GW fluctuations with vertical scales less than 7 km at northern midlatitudes is observed to be similar to that at southern midlatitudes, but there is a significant interhemispheric difference in the longitudinal dependence of GW fluctuations. The GPS/MET data at northern midlatitudes show a rapid change of the gravity wave distribution from 25 to 35 km height, resulting in a broad maximum of temperature variance located over the Atlantic and Eurasia. We only find in the wave distribution at h = 25 km some weak traces of possible orographic effects. On the other hand, the distribution of GW fluctuations at southern midlatitudes has a strong and sharp maximum over Andes, which is obviously due to orographic wave generation by the interaction of surface wind with the Andean mountain ridge. This observation of the new GPS radio occultation technique is in agreement with previous measurements of spaceborne microwave and infrared limb sounders. The amplitude of the average wave field increases with height over Andes, while the amplitude maximum moves westward, against the prevailing wind. The temperature fluctuations have an apparent, dominant vertical wavelength of around 6 km. In situ measurements by a balloon-borne rawinsonde at Ushuaia, Argentina (54.7°S, 68.1°W) are compared to a simultaneous GPS/MET temperature profile. The balloon observations of temperature and horizontal wind are interpreted by a large amplitude mountain wave propagating to the upper stratosphere. Wave characteristics and atmospheric background conditions are investigated in detail for this mountain wave observation. Finally, the GPS/MET experiment indicates enhanced sporadic E in the lower ionosphere over Southern Andes. We assume that these plasma irregularities are generated by enhanced, upward wave flux due to the possible orographic ettect of Andes. Copyright 2002 by the American Geophysical Union.
format Artículo
Artículo
publishedVersion
author Hocke, K.
Tsuda, T.
De La Torre, A.
author_facet Hocke, K.
Tsuda, T.
De La Torre, A.
author_sort Hocke, K.
title A study of stratospheric GW fluctuations and sporadic E at midlatitudes with focus on possible orographic effect of Andes
title_short A study of stratospheric GW fluctuations and sporadic E at midlatitudes with focus on possible orographic effect of Andes
title_full A study of stratospheric GW fluctuations and sporadic E at midlatitudes with focus on possible orographic effect of Andes
title_fullStr A study of stratospheric GW fluctuations and sporadic E at midlatitudes with focus on possible orographic effect of Andes
title_full_unstemmed A study of stratospheric GW fluctuations and sporadic E at midlatitudes with focus on possible orographic effect of Andes
title_sort study of stratospheric gw fluctuations and sporadic e at midlatitudes with focus on possible orographic effect of andes
publishDate 2002
url http://hdl.handle.net/20.500.12110/paper_01480227_v107_n20_p5_Hocke
http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_01480227_v107_n20_p5_Hocke_oai
work_keys_str_mv AT hockek astudyofstratosphericgwfluctuationsandsporadiceatmidlatitudeswithfocusonpossibleorographiceffectofandes
AT tsudat astudyofstratosphericgwfluctuationsandsporadiceatmidlatitudeswithfocusonpossibleorographiceffectofandes
AT delatorrea astudyofstratosphericgwfluctuationsandsporadiceatmidlatitudeswithfocusonpossibleorographiceffectofandes
AT hockek studyofstratosphericgwfluctuationsandsporadiceatmidlatitudeswithfocusonpossibleorographiceffectofandes
AT tsudat studyofstratosphericgwfluctuationsandsporadiceatmidlatitudeswithfocusonpossibleorographiceffectofandes
AT delatorrea studyofstratosphericgwfluctuationsandsporadiceatmidlatitudeswithfocusonpossibleorographiceffectofandes
_version_ 1766026667449384960

Ejemplares similares