11 Years of Rayleigh Lidar Observations of Gravity Wave Activity Above the Southern Tip of South America

Gravity wave (GW) activity is analyzed using temperature (T) data retrieved from a Rayleigh light detection and ranging (lidar) at Río Gallegos, Argentina (51.6°S, 69.3°W). GW characteristics are derived from 302 nights of observations providing more than 1,018 hr of high-resolution lidar data betwe...

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Guardado en:
Detalles Bibliográficos
Publicado: 2019
Materias:
GPS RO; SABER
gravity waves activity
lidar
polar vortex
southen South America
stratosphere
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_2169897X_v124_n2_p451_Llamedo
http://hdl.handle.net/20.500.12110/paper_2169897X_v124_n2_p451_Llamedo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_2169897X_v124_n2_p451_Llamedo
record_format dspace
spelling paper:paper_2169897X_v124_n2_p451_Llamedo2023-06-08T16:34:38Z 11 Years of Rayleigh Lidar Observations of Gravity Wave Activity Above the Southern Tip of South America GPS RO; SABER gravity waves activity lidar polar vortex southen South America stratosphere Gravity wave (GW) activity is analyzed using temperature (T) data retrieved from a Rayleigh light detection and ranging (lidar) at Río Gallegos, Argentina (51.6°S, 69.3°W). GW characteristics are derived from 302 nights of observations providing more than 1,018 hr of high-resolution lidar data between 20- and 56-km height from August 2005 to December 2015. T measurements are performed by a Differential Absorption Lidar instrument. This lidar was the southernmost outside Antarctica until the end of 2017. Río Gallegos is an exceptional place to observe large amplitude GW. Every lidar measurement is classified according to its relative position to the polar vortex. The lidar measurements are compared with collocated Sounding of the Atmosphere using Broadband Emission Radiometry and Global Positioning System-Radio Occultation data. The different instruments show different windows of the GW spectrum, providing complementary observations. In general, the geometric mean of the specific GW potential energy (PE) is larger during winter and spring than during summer and autumn. The largest geometric mean of PE is found inside the vortex and decreases monotonically at its edge, outside it and when there is no vortex. The same behavior is observed with satellite data. On average, it can be seen that lidar observations provide larger PE values than limb sounding measurements. From a Morlet continuous wavelet transform analysis, three distinct modes are captured from Sounding of the Atmosphere using Broadband Emission Radiometry and from Global Positioning System-Radio Occultation data at the upper and lower stratosphere, respectively. In particular, a systematic 3.5- to 4-year oscillation, possibly related to El Niño–Southern Oscillation is observed. ©2018. American Geophysical Union. All Rights Reserved. 2019 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_2169897X_v124_n2_p451_Llamedo http://hdl.handle.net/20.500.12110/paper_2169897X_v124_n2_p451_Llamedo
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 RO; SABER
gravity waves activity
lidar
polar vortex
southen South America
stratosphere
spellingShingle GPS RO; SABER
gravity waves activity
lidar
polar vortex
southen South America
stratosphere
11 Years of Rayleigh Lidar Observations of Gravity Wave Activity Above the Southern Tip of South America
topic_facet GPS RO; SABER
gravity waves activity
lidar
polar vortex
southen South America
stratosphere
description Gravity wave (GW) activity is analyzed using temperature (T) data retrieved from a Rayleigh light detection and ranging (lidar) at Río Gallegos, Argentina (51.6°S, 69.3°W). GW characteristics are derived from 302 nights of observations providing more than 1,018 hr of high-resolution lidar data between 20- and 56-km height from August 2005 to December 2015. T measurements are performed by a Differential Absorption Lidar instrument. This lidar was the southernmost outside Antarctica until the end of 2017. Río Gallegos is an exceptional place to observe large amplitude GW. Every lidar measurement is classified according to its relative position to the polar vortex. The lidar measurements are compared with collocated Sounding of the Atmosphere using Broadband Emission Radiometry and Global Positioning System-Radio Occultation data. The different instruments show different windows of the GW spectrum, providing complementary observations. In general, the geometric mean of the specific GW potential energy (PE) is larger during winter and spring than during summer and autumn. The largest geometric mean of PE is found inside the vortex and decreases monotonically at its edge, outside it and when there is no vortex. The same behavior is observed with satellite data. On average, it can be seen that lidar observations provide larger PE values than limb sounding measurements. From a Morlet continuous wavelet transform analysis, three distinct modes are captured from Sounding of the Atmosphere using Broadband Emission Radiometry and from Global Positioning System-Radio Occultation data at the upper and lower stratosphere, respectively. In particular, a systematic 3.5- to 4-year oscillation, possibly related to El Niño–Southern Oscillation is observed. ©2018. American Geophysical Union. All Rights Reserved.
title 11 Years of Rayleigh Lidar Observations of Gravity Wave Activity Above the Southern Tip of South America
title_short 11 Years of Rayleigh Lidar Observations of Gravity Wave Activity Above the Southern Tip of South America
title_full 11 Years of Rayleigh Lidar Observations of Gravity Wave Activity Above the Southern Tip of South America
title_fullStr 11 Years of Rayleigh Lidar Observations of Gravity Wave Activity Above the Southern Tip of South America
title_full_unstemmed 11 Years of Rayleigh Lidar Observations of Gravity Wave Activity Above the Southern Tip of South America
title_sort 11 years of rayleigh lidar observations of gravity wave activity above the southern tip of south america
publishDate 2019
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_2169897X_v124_n2_p451_Llamedo
http://hdl.handle.net/20.500.12110/paper_2169897X_v124_n2_p451_Llamedo
_version_ 1768542761869377536

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