Estudo da propagação vertical das ondas de gravidade de pequena escala observadas na Estação Antártica Comandante Ferraz nos anos de 2015 a 2017
This dissertation had the objective of identification and analysis of the vertical propagation conditions and possible sources of the gravity waves observed over the Comandante Ferraz Antarctic Station (EACF: 62.1° S; 58.4° W). It was investigated three years of airglow observations, in the hydroxyl...
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Universidade Federal de Santa Maria
2020
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ftunivfstmaria:oai:repositorio.ufsm.br:1/22347 2023-05-15T13:43:18+02:00 Estudo da propagação vertical das ondas de gravidade de pequena escala observadas na Estação Antártica Comandante Ferraz nos anos de 2015 a 2017 Vertical propagation study of the small scale gravity waves observed at Comandante Ferraz Antartic Station years of 2015 to 2017 Giongo, Gabriel Augusto Bageston, José Valentin http://lattes.cnpq.br/5409033276094963 Zimermann, Hans Rogério Wrasse, Cristiano Max 2020-12-09 application/pdf http://repositorio.ufsm.br/handle/1/22347 por por Universidade Federal de Santa Maria Brasil Meteorologia UFSM Programa de Pós-Graduação em Meteorologia Centro de Ciências Naturais e Exatas http://repositorio.ufsm.br/handle/1/22347 Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND Ondas de gravidade Aeroluminescência Dinâmica da alta atmosfera Propagação de ondas de gravidade Gravity waves Airglow High atmosphere dynamics Gravity wave propagation CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::METEOROLOGIA Dissertação 2020 ftunivfstmaria 2022-07-30T19:07:39Z This dissertation had the objective of identification and analysis of the vertical propagation conditions and possible sources of the gravity waves observed over the Comandante Ferraz Antarctic Station (EACF: 62.1° S; 58.4° W). It was investigated three years of airglow observations, in the hydroxyl near-infrared emission band (approximately between 84 and 88 km height). Wave parameters were obtained by a two-dimensional discrete Fourier Transform applied at the region of the images where a wave event was identified, returning the horizontal wavelength, observed period, phase speed, and propagation direction of the waves. Vertical propagation conditions and the wind filtering were verified, respectively, by analysis of the vertical wavenumber (m²) and by blocking diagrams. The vertical wavenumber and the intrinsic parameters were calculated with wind data from a meteor radar deployed at King Sejong Station (KSS), at the same island (King George) where EACF is, and by temperature data obtained by satellites. A ray-tracing model was utilized to estimate the wave propagation thru the atmosphere and the origin regions of these wave events. Among all the observed waves in the three years (522 cases), most of them presented wavelengths between 20 and 35 km, periods between 5 and 15 min, and phase speeds between 20 and 80 m/s. Among the waves in which the vertical propagations were analyzed, all waves were considered vertically propagating, and wave filtering is seen at heights near the observation layer. The blocking diagrams showed the anisotropy in the wave propagation direction. The ray-tracing returned, for 111 gravity wave cases, that mostly waves could originate at distances less than 500 km (in a straight line) from the observation site, at altitudes inside the mesosphere (33 %), some cases in the stratosphere (17 %), various cases (37 %) at troposphere (below 20 km), and for a few cases (13 events, 12 %) the model stopped at firsts iterations. The model could not relate tropospheric sources to the observed ... Thesis Antarc* Antarctic antartic* Antártica Unknown Alta Antarctic Ferraz ENVELOPE(-64.117,-64.117,-65.117,-65.117) King Sejong Station ENVELOPE(-58.783,-58.783,-62.220,-62.220) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftunivfstmaria |
language |
Portuguese |
topic |
Ondas de gravidade Aeroluminescência Dinâmica da alta atmosfera Propagação de ondas de gravidade Gravity waves Airglow High atmosphere dynamics Gravity wave propagation CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::METEOROLOGIA |
spellingShingle |
Ondas de gravidade Aeroluminescência Dinâmica da alta atmosfera Propagação de ondas de gravidade Gravity waves Airglow High atmosphere dynamics Gravity wave propagation CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::METEOROLOGIA Giongo, Gabriel Augusto Estudo da propagação vertical das ondas de gravidade de pequena escala observadas na Estação Antártica Comandante Ferraz nos anos de 2015 a 2017 |
topic_facet |
Ondas de gravidade Aeroluminescência Dinâmica da alta atmosfera Propagação de ondas de gravidade Gravity waves Airglow High atmosphere dynamics Gravity wave propagation CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::METEOROLOGIA |
description |
This dissertation had the objective of identification and analysis of the vertical propagation conditions and possible sources of the gravity waves observed over the Comandante Ferraz Antarctic Station (EACF: 62.1° S; 58.4° W). It was investigated three years of airglow observations, in the hydroxyl near-infrared emission band (approximately between 84 and 88 km height). Wave parameters were obtained by a two-dimensional discrete Fourier Transform applied at the region of the images where a wave event was identified, returning the horizontal wavelength, observed period, phase speed, and propagation direction of the waves. Vertical propagation conditions and the wind filtering were verified, respectively, by analysis of the vertical wavenumber (m²) and by blocking diagrams. The vertical wavenumber and the intrinsic parameters were calculated with wind data from a meteor radar deployed at King Sejong Station (KSS), at the same island (King George) where EACF is, and by temperature data obtained by satellites. A ray-tracing model was utilized to estimate the wave propagation thru the atmosphere and the origin regions of these wave events. Among all the observed waves in the three years (522 cases), most of them presented wavelengths between 20 and 35 km, periods between 5 and 15 min, and phase speeds between 20 and 80 m/s. Among the waves in which the vertical propagations were analyzed, all waves were considered vertically propagating, and wave filtering is seen at heights near the observation layer. The blocking diagrams showed the anisotropy in the wave propagation direction. The ray-tracing returned, for 111 gravity wave cases, that mostly waves could originate at distances less than 500 km (in a straight line) from the observation site, at altitudes inside the mesosphere (33 %), some cases in the stratosphere (17 %), various cases (37 %) at troposphere (below 20 km), and for a few cases (13 events, 12 %) the model stopped at firsts iterations. The model could not relate tropospheric sources to the observed ... |
author2 |
Bageston, José Valentin http://lattes.cnpq.br/5409033276094963 Zimermann, Hans Rogério Wrasse, Cristiano Max |
format |
Thesis |
author |
Giongo, Gabriel Augusto |
author_facet |
Giongo, Gabriel Augusto |
author_sort |
Giongo, Gabriel Augusto |
title |
Estudo da propagação vertical das ondas de gravidade de pequena escala observadas na Estação Antártica Comandante Ferraz nos anos de 2015 a 2017 |
title_short |
Estudo da propagação vertical das ondas de gravidade de pequena escala observadas na Estação Antártica Comandante Ferraz nos anos de 2015 a 2017 |
title_full |
Estudo da propagação vertical das ondas de gravidade de pequena escala observadas na Estação Antártica Comandante Ferraz nos anos de 2015 a 2017 |
title_fullStr |
Estudo da propagação vertical das ondas de gravidade de pequena escala observadas na Estação Antártica Comandante Ferraz nos anos de 2015 a 2017 |
title_full_unstemmed |
Estudo da propagação vertical das ondas de gravidade de pequena escala observadas na Estação Antártica Comandante Ferraz nos anos de 2015 a 2017 |
title_sort |
estudo da propagação vertical das ondas de gravidade de pequena escala observadas na estação antártica comandante ferraz nos anos de 2015 a 2017 |
publisher |
Universidade Federal de Santa Maria |
publishDate |
2020 |
url |
http://repositorio.ufsm.br/handle/1/22347 |
long_lat |
ENVELOPE(-64.117,-64.117,-65.117,-65.117) ENVELOPE(-58.783,-58.783,-62.220,-62.220) |
geographic |
Alta Antarctic Ferraz King Sejong Station |
geographic_facet |
Alta Antarctic Ferraz King Sejong Station |
genre |
Antarc* Antarctic antartic* Antártica |
genre_facet |
Antarc* Antarctic antartic* Antártica |
op_relation |
http://repositorio.ufsm.br/handle/1/22347 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766187297665974272 |